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  • Efficient reduction of Cr(VI) under visible light irradiation using CuS nanostructures
    Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-17
    Sawsen Nezar, Yacine Cherifi, Alexandre Barras, Ahmed Addad, Elhadj Dogheche, Nadia Saoula, Nadia Aïcha Laoufi, Pascal Roussel, Sabine Szunerits, Rabah Boukherroub

    Photoreduction of hexavalent chromium, Cr(VI), identified as carcinogenic and mutagenic element, to Cr(III), believed to be an essential element, using copper sulfide nanostructures (CuS NSs) as photocatalyst was investigated under visible light irradiation (λ>420 nm). The CuS NSs were synthesized at low temperature using a wet chemical route and fully characterized using various techniques such as scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy and UV-vis spectrophotometry. The photocatalytic reduction of Cr(VI) using visible light irradiation was assessed by UV-vis by following the decrease of the characteristic absorbance at ∼352 nm in the presence of CuS NSs. While CuS NSs promoted Cr(VI) full reduction within 60 min, addition of adipic acid or formic acid accelerated significantly the photocatalytic reduction process. Under optimized conditions, CuS NSs rapidly (12 min) reduced Cr(VI) in presence of 0.5 mM adipic acid. Similarly, Cu NSs were found to be efficient for Cr(VI) reduction dissolved in water from a local lake. Stability studies showed that the photocatalyst could be recycled up to three times without any apparent decrease of its catalytic performance.

    更新日期:2018-01-17
  • In vitro antioxidant actions of sulfur-containing amino acids
    Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-09
    Ji-Han Kim, Hyun-Joo Jang, Won-Young Cho, Su-Jung Yeon, Chi-Ho Lee
    更新日期:2018-01-10
  • Polydopamine-functionalized graphene nanoplatelet smart conducting electrode for biosensing applications
    Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-09
    Prosper Kanyong, Francis D. Krampa, Yaw Aniweh, Gordon A. Awandare
    更新日期:2018-01-10
  • A label-free colorimetric sensor based on silver nanoparticles directed to hydrogen peroxide and glucose
    Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-07
    Nghia Duc Nguyen, Tuan Van Nguyen, Anh Duc Chu, Hoang Vinh Tran, Luyen Thi Tran, Chinh Dang Huynh
    更新日期:2018-01-07
  • Carboxymethylagarose-based multifunctional hydrogel with super stretchable, self-healable having film and fiber forming properties
    Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-05
    Jai Prakash Chaudhary, Faisal Kholiya, Nilesh Vadodariya, Vimal M. Budheliya, Azaz Gogda, Ramavatar Meena

    In this work, we repot a super stretchable and quick self-healable composite hydrogels with film and fiber forming properties through introducing hydrogen and covalent bonding. Herein, carboxymethylagarose (CMA) and polyvinyl alcohol (PVA) acts as physical crosslinkers. Boric acid (BA) prompt the formation of crosslinking through hydrogen bonding with blend polymers followed by strong ionic bonding between hydroxyl (-OH) groups of PVA and borate ions of BA. Hydrogel obtained under optimum conditions shows excellent stretching (> 100 times), quick self-healing (< 1 Sec), notches insensitive stretching, fiber and film forming ability. Such integrated properties for a hydrogel system have been achieved using seaweed derived polymer for the first time. In summary, this study opens up a new possibility to design and assemble multifunctional hydrogels using abundant seaweed derived polysaccharides with outstanding stretching, healing plus other properties by simple crosslinking chemistry.

    更新日期:2018-01-06
  • Preparation and Application of Magnetic Zinc Pyridinedicarboxylic Acid Nanocomposite (Zn-(PDC)2@Fe3O4)
    Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-03
    Shuai Zhang, Shoulian Wei, Hao Cheng, Wei Li

    Nano-scaled Fe3O4 were synthesized using solvothermal synthesis, and amino-modification of nano-scaled Fe3O4 was conducted with APTES. With Fe3O4-NH2 and Zn2+ as the metal centers, 2,6-pyridinedicarboxylic acids as the organic ligand, and using the one-step ultrasonic-assisted method, a new magnetic zinc pyridinedicarboxylic acid nanocomposite (Zn-(PDC)2@Fe3O4) was synthesized. The structure, composition and morphology of the products were characterized using methods such as X-ray single crystal diffraction, Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction, and scanning electron microscope. The results showed that the Zn-(PDC)2 was almost an octahedron, and the Zn-(PDC)2@Fe3O4 looked like a nanoflower. The mimetic peroxidase properties of Zn-(PDC)2@Fe3O4 were studied with H2O2 solution and TMB solution as the substrates, and the results showed that: the Michaelis constant of H2O2 by Zn-(PDC)2@Fe3O4 was: Km = 0.411 mM, the maximum reaction rate: vmax = 3.440×10-8 M·s-1; the Michaelis constant of TMB by Zn-(PDC)2@Fe3O4 was: Km = 0.189 mM, and the maximum reaction rate: vmax = 2.419×10-8 M·s-1, both of which were lower than those of H2O2 and TMB by Fe3O4 and Horseradish Peroxidase (HRP). Based on the reduction of the absorbance of original solution due to the consumption of H2O2 in oxidation-reduction reaction between SO32- and H2O2 under acid conditions, a new method for determining the content of SO32- was established. The linear range of SO32- was 8×10-7∼8×10-5 mol/L, the detection limit of SO32- was 8×10-8 mol/L, and the RSD of SO32- was 2.7∼9.2%.

    更新日期:2018-01-04
  • In-Situ Synthesis of CuO Nanoparticles in P(NIPAM-co-AAA) Microgel, Structural Characterization, Catalytic and Biological Applications
    Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-02
    Jahanzeb Khan, Muhammad Siddiq, Bilal Akram, Muhammad Aqeel Ashraf

    The production of new multi-responsive poly(N-isopropylacrylamide-allyl acetic acid) [P(NIPAM-AAA)] copolymer microgel by free radical emulsion polymerization is reported. Inside this copolymer microgel CuO nanoparticles were generated by in situ reduction of copper nitrate followed by the air oxidation process, their fabrication is confirmed by powdered X-ray diffraction analysis and the average size of CuO NPs was found to be 24 nm having monoclinic shapes. By using dynamic laser light scattering the swelling & de-swelling behaviour of the pure microgel was examined at different temperature and pH values. The copolymer microgel becomes unstable at low pH as well as at high temperature values respectively.UV-visible spectra show a red shift in surface plasmon resonance λSPR of CuO nanoparticles. The catalytic property of hybrid microgel was inspected by observing the reduction of 4-nitrophenol into 4-aminophenol in the presence of excess NaBH4 with various concentrations of catalyst at room temperature. The hybrid microgels also have good anti-bacterial activity against both Gram-positive (C.Albicans) and Gram-negative (E. coli) bacteria.

    更新日期:2018-01-03
  • Molecules and Functions of Rosewood: Pterocarpus cambodianus
    Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-02
    Lou Junwei, Chen Juntao, Ni Changyu, Wanxi peng

    Pterocarpus is a high-end, expensive furniture materials collectively. Pterocarpus products have a certain human health function. In this paper, Pterocarpus cambodianus Pierre as an example, we study its human health components by using PY-GC-MS, TDS-GC-MS and GC-MS. The composition of known human health functions was studied by reviewing the literature. 1-Heptatriacotanol has anti-hypercholesterolemic effects. Cryptomeridiol is a natural product of anti-Alzheimer's disease and antispasmodic nature, and has a significant medicinal value. 7-Methyl-Z-tetradecen-1-ol acetate has the effect of heat and heat cough. .alpha.-Bisabolol can be used to treat leishmaniasis caused by Lactobacillus infants.

    更新日期:2018-01-03
  • Electrocatalytic urea mineralization in aqueous alkaline medium using NiIIcyclam-modified nanoparticulate TiO2 anodes and its relationship with the simultaneous electrogeneration of H2 on Pt counterelectrodes
    Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-02
    S. Murcio-Hernández, A.V. Rueda-Solorio, J.A. Banda-Alemán, C. González-Nava, F.J. Rodríguez, E. Bustos, F. Espejel-Ayala, A. Rodríguez, S. Sepúlveda, J. Manríquez
    更新日期:2018-01-03
  • Systematic Characterization of Volatile Organic Components and Pyrolyzates from Camellia oleifera Seed Cake for Developing High Value-added Products
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-31
    Lili Liu, Xuexiang Cheng, Linzuo Teng, Yunhao Wang, Xiang Dong, Lili Chen, Dangquan Zhang, Wanxi Peng

    Camellia oleiferaseed cake (COSC), a byproduct during oil production of C. oleiferaseeds, has been extremely abundant. However, due to the lack of systematic and in-depth analysis about the chemical composition of COSC, it is difficult to develop high value-added products, resulting in low processing efficiency or even directly abandoned. In this paper, the VOCs (Volatile organic components) characteristics of COSC and the variation rule of COSC groups before/after extraction were revealed, and the thermal loss law of COSC and the pyrolyzates characteristics at different temperatures were also explained. The main VOCs of ethanol extractive of COSC are alcohols, those of petroleum ether extractive are alkanes and organic acids, and those of benzene/ethanol extractive are esters. It is first reported here that rich 1,6,10-Dodecatrien-3-ol,3,7,11-trimethyl-, (E)-, namely nerolidol with wide use in cosmetics and biomedicine, exists in COSC extractives. In addition, bioactive VOCs such as β-caryophyllene, humulene and (E)-Atlantone were observed in three COSC extractives. The total content trend from high to low is petroleum ether extractive, ethanol extractive, benzene/ethanol extractive, indicating that petroleum ether extractive has the best developing prospects. The analytic results of FTIR further confirm that: (1) the COSC contains components including Si compounds, ethers, organic acids, esters and alcohols, (2) the four kinds of organic silicon detected are naturally occurring components in COSC, and (3) organic solvent extraction does not make compound groups of COSC significantly changed. There are four obvious stages in thermogravimetry treatment of COSC: the first (30°C-100°C), the second (180°C-240°C), the third (240°C-400°C), and the fourth (400°C-567°C), and the order of the mass loss is the third, the second, the fourth and the first. During thermogravimetry treatment, three critical turning points of temperature (240°C, 400°C and 567°C) were observed, accompanied by significantly chemical changes such as macromolecule pyrolyzed into small volatile molecules. The four COSC extractive pyrolyzates at 300°C, 450°C, 600°C and 750°C have different content variation in the components, such as heterocyclic type with a high-low-high-low change, hydrocarbons and acids shown by the high-low-low-high process, and ketone and the alcohol with a low-high-low-high change. The 450°C pyrolyzates of COSC residue after extraction are heterocyclic, ketone, phenolic more than esters, hydrocarbons, phosphide, acids, aldehydes, alcohols and acyl; the 600°C pyrolyzates are heterocyclic, ketone, phenolic more than esters, ammonium, phosphide, acid, aldehydes and alcohols. Here, a large number of new components are produced in the pyrolysis treatment for COSC extractive and residue, providing a new approach for the high-grade application of COSC.

    更新日期:2017-12-31
  • Molecules and Functions of Rosewood: Dalbergia stevenson
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-29
    Shuai Cheng Jiang, Sheng Bo Ge, Mu Zi Wang, Wanxi Peng

    In this paper, the organic solvent extract was analyzed by Fourier transform infrared spectroscopy (FT-IR) and gas chromatography-mass spectrometry (GC-MS), TG, Py-GC-MS and TD-GC-MS were used to analyze the Dalbergiastevenson. And then, the pyrolysis products were analyzed by GC-MS. The chromatographic peak area normalization method was used to calculate the groups The relative content of the points. The results show that there are many kinds of bioactive ingredients in the berzolis sandalwood extract, mainly some alcohols and phenolic compounds. And in bio-energy, bio-medicine, cosmetics, skin care products and spices and other fields have potential application prospects.

    更新日期:2017-12-31
  • Molecules and Functions of Rosewood: Diospyros celebica
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-29
    Juntao Chen, Changyu Ni, Junwei Lou, Wanxi Peng

    Pterocarpus and Pterocarpus products have certain human health function. In this paper, Diospyros celebica Bakh as an example, we study its human health components by using PY-GC-MS, TDS-GC-MS and GC-MS.The composition of known human health functions was studied by reviewing the literature. 3-O-Methyl-d-glucose has a certain conservation property, and it can protect the pancreatic B cells against the toxicity of alloxan. P-Cresol plays a role in endothelial dysfunction in uremic patients, and it can repair wounds and reduce endothelial progression. 2(3H)-Furanone, 5-methyl- has certain biological resistance, and has high antimicrobial activity against NCIM 2501 and NCIM 5021.

    更新日期:2017-12-31
  • Hemicellulose structural changes during steam pretreatment and biogradation of Lentinus Edodes
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-29
    Shengbo Ge, Xiangmeng Chen, Dongli Li, Zhenling Liu, Hui Ouyang, Wanxi Peng, Zhongfeng Zhang

    To disclosed the internal factors for the growth of mycelium and Lentinus edodes, Quercus Linn wood, which was biotransformed during the artificial cultivation of Lentinus edodes, were synergistically characterized by TGA/DTG, FT-IR and NMR. The results showed that the different ingredients of hemicellulose decreased during steam explosion and biodegradation of Lentinus edodes, however hemicellulose content continued to increased. FT-IR showed that the transmittance of the characteristic peaks in hemicellose gradually increased after decreased after steam explosion and biodegradation of Lentinus edodes. TGA/DTG curves that thermal stability and maximum thermal degradation rates of hemicelloses were contiguous after steam explosion and biodegradation of Lentinus edodes. Structural determination based on FT-IR and 1H, and 2D-HSQC NMR analyses showed that the alkali-extractable hemicelluloses shared the structure composed of (1→4)-linked β-D-xylopyranosyl backbone with 4-O-methyl-R-D-glucuronic acid attached to O-2 of the xylose residues and L-arabinose attached to O-3 of the xylose residues. And it revealed that the extractable hemicelluloses retained original structure without cleaving chemical linkages. Furthermore, a small amount of other minor hemicelluloses (β-glucans) including xylans in the extractable hemicelluloses could be identified by NMR and other approaches.

    更新日期:2017-12-31
  • Potential use of different kinds of carbon in production of decayed wood plastic composite
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-29
    Sheng-bo Ge, Jiao-jiao Ma, Shuai-cheng Jiang, Zhenling Liu, Wan-xi Peng

    This study investigated the mechanical, chemical structure and thermal properties of hot press molded wood plastic composite (WPC) panels produced from different amounts (30, 40, or 50% weight) of decayed Pinus massoniana Lamb. and polypropylene with chitosan(3 wt%) and different kind of carbon(2 wt%). The results were compared with the properties of WPC produced without carbon. The mechanical, chemical structure and thermal data showed that WPC with carbon was better than WPC without carbon, and the best condition to produce decayed wood plastic composite was hot pressing temperature at 170°C for12min, Carbon Nanotubes(CNT) and chitosan(CS) accounting for 2% and 3% of total mass, and the proportion of decayed wood and PVC is 40% and 60% .

    更新日期:2017-12-31
  • Preparation and Properties of Novel Flame-retardant PBS Wood-plastic Composites
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-29
    ShuaiCheng Jiang, YangQiang Wei, ShengBo Ge, WanXi Peng

    Poly (butylene succinate) (PBS), as a fully biodegradable thermoplastic, have developed rapidly due to its integrated performance and processibility. The CaCO3 as a reinforcing component, and AHP, APP and CaHP as a flame-retardant component were separately incorporated into PBS matrix. A series of PBS-based composites were fabricated via melting blending using internal mixer followed by injection molding. The results show that the different filling ratio has a certain influence on the mechanical properties of the composites. When the filling amount of wood powder is 40 copies, the composite mechanical properties of the composite is better. CaCO3 addition, the composite material of the bending strength, tensile strength have improved significantly. The results showed that small amount of AHP, APP and CaHP improved the tensile strength of PBS composites, however, the tensile strength decreased as further increase amount of AHP, APP and CaHP. Cone Calorimeter testing revealed that, the combination of AHP, APP and CaHP could significantly reduce the pHRR and the total heart release (THR) of the composites. TGA test indicated that the addition of AHP, APP and CaHP could significantly increase the char residue and reduce the mass loss rate. TGA test indicated that the addition of AHP, APP and CaHP could significantly increase the char residue and reduce the mass loss rate. Through the research of mechanical and thermal properties of PBS composite, it could lay a foundation of the application of PBS composite in different fields.

    更新日期:2017-12-31
  • Zno/Nio Coated Multi-Walled Carbon Nanotubes for Textile Dyes Degradation
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-28
    Jahanzeb Khan, Sadia Ilyas, Bilal Akram, Khalil Ahmad, Muhammad Hafiz, Muhammad Siddiq, Muhammad Aqeel Ashraf

    The nanocomposites of ZnO/NiO loaded Multiwalled Carbon Nanotubes (MWNTs) were successfully fabricated using co-precipitation method. The synthesized photocatalyst were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX) spectroscopy, Diffused reflectance spectroscopy (DRS) and Fourier transform infrared spectroscopy (FTIR) for the determination of crystal structure, morphology, elemental composition and optical properties respectively. The photocatalytic activity of as prepared photocatalyst was determined by monitoring the degradation of methyl orange (an azo dye) under ultra-violet (280 nm) and visible (480 nm) irradiation. The Diffuse reflectance spectra (DRS) exhibits absorbance tail around 400 nm, in the near UV region. SEM analysis shows the homogenous dispersion of ZnO and NiO on the surface of MWNTs. The efficiency for Photodegradation of ZnO coated MWNTs is shown to be greater than the efficiency of pristine ZnO. When NiO was loaded on the surface of MWNTs having ZnO coated layer, the activity was further enhanced and reached maximum for 3% NiO loading. The degradation in visible region is believed to be proceeding through self-sensitized degradation of pre-adsorbed dye. A different behavior for degradation was observed for ZnO coated MWNTs and ZnO/NiO coated MWNTs, which suggests that complete mineralization of azo dyes can be achieved in a self-sensitized degradation process after employing ZnO/NiO coated MWNTs.

    更新日期:2017-12-31
  • A Polycarboxylate as a Superplasticizer for Montmorillonite Clay in Cement: Adsorption and Tolerance Studies
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-28
    Gang Chen, Jiaheng Lei, Yong Du, Xiaodi Du, Xuebing Chen

    A novel polycarboxylate superplasticizer (PCE) with a long polyoxyethylene(PEO) chain and a terminal carboxylic group was synthesized from a modified polyether (SAE-IPEG) to increase its performance in cement. The molecular structure of the PCE was characterized by infrared spectroscopy and 1H nuclear magnetic resonance (NMR) spectroscopy. The performance of synthesized PCE in cement was studied in the absence and the presence of montmorillonite (Mmt) clay. It was found that the PCE disperses in cement uniformly without aggregation, which is different significantly from the conventional PCEs. Adsorption measurements and X-ray diffraction analysis revealed that the synthesized PCE only interacted with Mmt via surface adsorption, whereas the conventional PCEs interact with the clay through the surface adsorption and the chemical intercalation. Such dramatic change could be ascribed to the introduction of an electronegative carboxylic acid group as a terminal group into the long polyoxyethylene chain of PCE, which reduced the adsorption and enhanced tolerance of PCE on Mmt.

    更新日期:2017-12-31
  • Synthesis of highly water-dispersible N-doped anatase titania based on low temperature solvent-thermal method
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-28
    Wenyi Huang, Hao Cheng, Jun Feng, Zhipeng Shi, Dawei Bai, Lijun Li

    In this paper, the high-concentration aqueous dispersion N-doped anatase TiO2 is prepared based on low temperature non-aqueous solvent-thermal method by using TCl4 and NH4Cl as titanium source and nitrogen source respectively. From TEM image, we can learn that the particle is composed of spindle-shaped particles with the size from 8 to 15 nm. According to the XRD and XPS spectra of N-doped TiO2, it can be seen that, during the synthesis process, N atoms permeate into the TiO2 lattice, and the impurity level can be formed within the band gap of TiO2. The impurity level can extend to absorb UV and the visible light. As for N-doped TiO2 nanoparticle of XPS spectrum, ethanol is used as solvent to form carbonaceous species on the surface of TiO2. The carbonaceous species in visible light can excite electrons towards the TiO2 conduction band, so as to increase the number of electrons in the conduction band under visible light to improve the catalytic activity of TiO2 which possesses the feature of high catalytic activity under UV-visible light.

    更新日期:2017-12-31
  • Heat transfer and fouling behaviors of super hydrophobic nanotube-array coating on titanium substrate in pool boiling
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-28
    Yan Lv

    Superhydrophobic nanotube-array coating on titanium substrate was fabricated by using electrochemical anodic oxidation method with ultrasonic assistance and fluoroalkyl silane modification. Surface morphology and wettability of the superhydrophobic coating were characterized via scanning electron microscope and optical static contact angle measuring device. Expeimental investigation was carried out to assess the heat transfer property and fouling behavior of superhydrophobic titanium-based nano-porous coating in pool boiling by using pool boiling experimental device. Superhydrophilic titanium-based nano-porous surface and bare titanium substrate surface were also investigated as contrasts. The results indicated that, compared with superhydrophilic titanium-based nano-porous surface and bare titanium substrate surface, the heat transfer property of superhydrophobic titanium-based nano-porous coating was superior to bare titanium substrate and superhydrophilic titanium-based nano-porous surface because it could produce more bubble nucleation sites which were beneficial to heat transfer. Superhydrophilic titanium-based nano-porous surface presented the worst heat transfer property. Besides, superhydrophobic nano-porous coating also had better antifouling property in pool boiling heat transfer, while superhydrophilic nano-porous surface was easier to deposite fouling.

    更新日期:2017-12-31
  • New method for effective identification of adulterated Camellia oil basing on Camellia oleifera-specific DNA
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-28
    Xuexiang Cheng, Zhenling LIU, Tao Yang, Yunhao Wang, Li Yan, Linzuo Teng, Fangbin Wang, Lili Chen, Yan He, Kunpeng Guo, Dangquan Zhang
    更新日期:2017-12-31
  • Voltammetric determination of capsaicin using CeO2-surfactant/SWNT-modified electrode
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-27
    Guzel Ziyatdinova, Endzhe Ziganshina, Aliya Shamsevalieva, Herman Budnikov
    更新日期:2017-12-31
  • Nano Properties Analysis Via Fourth Multiplicative ABC Indicator Calculating
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-27
    Wei Gao, Weifan Wang, Darko Dimitrov, Yiqiao Wang

    In the field of nanoscience, there are a large number of new nanomaterials produced in the laboratory every year. These nanomaterials need to go through a lot of tests in engineering application before, to determine their physical, chemical and nanomedicine properties. The work demands a large number of experimental personnel, equipment and reagents, and it’s time-consuming as well. In the theoretical nanoscience, the various features can be obtained through the computation of topological index on nano molecular structures. In this paper, we study the fourth multiplicative atom-bond connectivity indices of some special molecular structures which commonly appeared in the compound of nanomaterials, and their specific expressions are given. The results yielded in this work will be a guidance for the practical nanoscience applications.

    更新日期:2017-12-31
  • One-step synthesis of reduced graphene oxide/gold nanoparticles under ambient conditions
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-27
    R. Britto Hurtado, M. Cortez-Valadez, J.R. Aragon-Guajardo, J.J. Cruz-Rivera, F. Martínez-Suárez, M. Flores-Acosta

    This study presents a novel synthesis method for the production of reduced-graphene-oxide functionalized with gold nanoparticles (rGO/Au-NPs) at ambient temperature. Both were obtained simultaneously using sucrose and chloroauric acid as precursors in the formation of the nanocomposite, and ascorbic acid as the reducing and stabilizing agent. Transmission electron microscopy (TEM) showed gold nanoparticles of 15-30 nm interacting with rGO laminates. Raman spectroscopy showed bands D and G centered at 1334 cm-1 and 1577 cm-1, respectively. The optical absorption analysis presented two bands centered at 522 nm and 260 nm, similar to the results reported in literature for Au-NPs and rGO.

    更新日期:2017-12-27
  • Synthesis, Characterisation and Photocatalytic performance of ZnS coupled Ag2S Nanoparticles: A Remediation Model for Environmental Pollutants
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-26
    Maryan Abbasi, Uzaira Rafique, Ghulam Murtaza, Muhammad Aqeel Ashraf

    The growing demand of industries has led to environmental degradation due to excessive release of toxic chemicals. Nanotechnology has developed to combat the impacts integrated with industrial revolution. The present investigation proposes a remediation model for toxic dyes and poly aromatic hydrocarbons by effective use of nanotechnology. For this purpose, zinc sulphide (ZnS), silver sulfide (Ag2S)and bimetallic ZnS-Ag2S are synthesized from a single source precursor and evaluated as potential photocatalytic agents. The synthesized nanoparticleswere characterized by a range of techniques like UV-visible, PL, XRD, EDX, TEM and TGA. The results indicated that preparednanoparticles were crystalline, spherical in shape, possess obvious atomic planes with a size in the range of 6-12nm. Each of the synthesized material was tested as potential photocatalyst candidate for the degradation of representative azo-dyes (Crystal Violet, Congo Red) and polyaromatic hydrocarbons (Naphthalene, Phenanthrene and Pyrene)under visible light irradiation source. The degradation efficiency of the synthesized nanoparticles was calculated to be more than 70% for Crystal Violet and 80%for Congo Red upon contact with the dye solutions for 50 minutes and pseudo second order kinetic model was found to be the best fit. The synthesized nanoparticleswere also effective in its own significance for the degradation of polyaromatic hydrocarbons. The fragmentation study of polyaromatic hydrocarbons using nanoparticles postulates that phthalic acid pathway is the predominant mechanism for PAHs.It is recommended that environmental compartment with mix pollutants can conveniently be treated with a single material to an appreciable extent. The study offers economical and environment friendly remediation model.

    更新日期:2017-12-27
  • Molybdenum Disulfide (MoS2) Nanosheets Vertically Coated on Titanium for Disinfection in the Dark
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-24
    Kaiwei Tang, Lanyu Wang, Hao Geng, Jiajun Qiu, Huiliang Cao, Xuanyong Liu
    更新日期:2017-12-27
  • 更新日期:2017-12-27
  • Synthesis, characterizations, and antibacterial properties of PbMoO4 nanocrystals
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-24
    J.V.B. Moura, T.S. Freitas, A.R.P. Silva, A.T.L. Santos, J.H. da Silva, R.P. Cruz, R.L.S. Pereira, P.T.C. Freire, C. Luz-Lima, G.S. Pinheiro, H.D.M. Coutinho

    This study reports the synthesis and characterization of PbMoO4 nanocrystals and the antibacterial properties and modulation of their antibiotic activity. Lead molybdate nanocrystals were obtained through the conventional hydrothermal method, and the structural, vibrational and morphological properties of the sample were determined using X-ray diffraction, Raman and infrared spectroscopy, and scanning electron microscopy images. The obtained samples present scheelite-type tetragonal structure (space group I41/a) without secondary phases, and the Raman spectrum shows the formation of PbMoO4 structurally ordered at short-range, confirming the quality of the samples. The antibacterial and antibiotic-modulation activities were performed in triplicate using the microdilution method. The minimum inhibitory concentration (MIC) of antibiotics alone or in association with PbMoO4, were demonstrated using geometric mean. When assayed directly, the PbMoO4 presented a MIC ≥ 1024 μg/mL against all bacterial strains tested. When in association with the gentamicin against Staphylococcus aureus, a synergism was observed reducing 37.5% the MIC. However, in the assays against the Gram-negative strains was observed that the presence of lead affected the effect of the antibiotic, leading to an antagonism.

    更新日期:2017-12-27
  • Broad spectral inhibitory effects of pale green zinc oxide nanophosphor on bacterial and fungal pathogens
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-21
    H.J. Amith Yadav, B. Eraiah, H. Nagabhushana, B. Daruka Prasad, R.B. Basavaraj, M.K. Sateesh, J.P. Shabaaz Begum, G.P. Darshan, G.R. Vijayakumar

    Nd3+ doped zinc oxide nanophosphor were prepared by a modified sonochemical route. Adsorption of aloe vera (A.V.) gel by the precursors made the final product with controlled the morphology, that is A.V. gel acted as surfactant. Characterization studies confirmed the pure hexagonal phase with nanostructure, wide-bandgap was reported. Major electronic transitions in the prepared samples were due to 4f shell electrons of Nd3+ions. Emission peaks attributed to 2P3/2→ 4I13/2, 2P3/2→4I15/2, 1I6→3H4, 2P1/2→4I9/2 and 4G7/2→4I9/2 transitions under the excitation wavelength of 421 nm. The emitted wavelengths showed the redshift from blue to pale green region. Further, the prepared samples showed very good control over the growth of microbial pathogens such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa, Alternaria alternata and Fusarium oxysporum. The proposed mechanism is that the ZnO:Nd3+ intertwinds the bacteria and fungal pores with a heterogeneous range of superstructues, resulting in the local perturbation at cell membrane of fungal cells. This induces the decrease the potential energy at bacterial membrane and the leakage of electrolytes of fungal spores. There is a mechanical wrapping interaction between pathogens and the nanoparticles which locally damages the cell membrane and causes cell lysis. Biocompatible, ZnO:Nd3+ nanostructures possesses antibacterial activity against more multi-resistant bacterial and fungal phytopathogens. This additional information provides useful scientific information to prevent the various crop diseases.

    更新日期:2017-12-21
  • Influence of oxygen functionalization on physico-chemical properties of imidazolium based ionic liquids - experimental and computational study
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-16
    Aleksandar Tot, Črtomir Podlipnik, Marija Bešter-Rogač, Slobodan Gadžurić, Milan Vraneš

    In this work, four different oxygen functionalized ionic liquids, 1-(3-hydroxypropyl)-3-methylimidazolium chloride,[OHC3mIm][Cl], 1-(3-hydroxypropyl)-3-ethylimidazolium chloride ([OHC3eIm][Cl], 1-(2-oxobutyl)-3-methylimidazolium chloride,[C2OC2mIm][Cl] and 1-(4-hydroxy-2-oxobutyl)-3-methylimidazolium chloride, [OHC2OC2mIm][Cl] were synthesized in liquid state at room temperature. Detailed physico-chemical characterisation (density, viscosity and conductivity) supported with computational simulations for pure ionic liquid and their aqueous solutions were performed. Based on these examinations, interactions in pure ionic liquids and interactions between water and synthesized ionic liquids were discussed.

    更新日期:2017-12-18
  • Development and validation of RT-HPLC-DAD method for biogenic amines determination in probiotic yogurts
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-16
    Carla Paulo Vieira, Marion Pereira da Costa, Vitor L.M. Silva, Beatriz da Silva Frasao, Letícia F.M. Campos de Aquino, Yves E.C. de Oliveira Nunes, Carlos Adam Conte-Junior

    A new procedure for the determination of biogenic amines (BAs), putrescine, cadaverine, spermidine, spermine and tyramine, based on the purification through precipitation and centrifugation of peptides in an acid extract from the sample is proposed. The novelty of the procedure in relation to the liquid-liquid purification reported in the literature is based on shortening the time of analysis and reducing BAs losses during sample preparation. The procedure permitted better precision, recovery, and sensibility, particularly in lower concentration levels, when compared to extraction without purification before derivatization. The method was applied to the simultaneous determination of the five aforementioned BAs in commercial yogurt samples by reversed-phase high-performance liquid chromatography (RP-HPLC). The procedure presented adjusted correlation coefficients between 0.980 and 0.997, and linear range in samples of 1-50 mg.L-1 (cadaverine), 3-50 mg.L-1 (putrescine, spermidine and spermine) and 5-50 mg.L-1 (tyramine), with accuracy ranging from 67.81% to142.78% in the limit of quantification (LOQ) and from 88.99% to118.26% in other concentration levels. The limit of detection of BAs in yogurt samples was 0.18-4.01 mg.L-1, while LOQ ranged between1-5 mg.L-1. The intraday relative standard deviation was ≤ 15.74% in LOQ and ≤ 10.05% in other concentration levels. The purification step by precipitation was fundamental to eliminate the interferences present in the yogurt samples, and it was relevant to increase the sensitivity of BAs detection when compared to liquid-liquid purification.

    更新日期:2017-12-18
  • 更新日期:2017-12-15
  • Manganese porphyrins as efficient catalysts in solvent-free cyclohexane oxidation
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-14
    Mariana Goes de Araujo Tôrres, Vinicius Santos da Silva, Ynara Marina Idemori, Gilson DeFreitas-Silva

    Novel non-symmetric third-generation manganese metalloporphyrins, chlorido(5-(4-nitrophenyl)-10,15,20-triphenyl-2,3,7,8,12,13,17,18 octobromoporphyrinate)manganese(III) (MnBr8P1) and the mixture of isomers chlorido(5,10-(4-nitrophenyl)-15,20-diphenyl-2,3,7,8,12,13,17,18 –octabromopor-phyrinate)manganese(III) and chlorido(5,15-(4-nitrophenyl)-10,20-diphenyl-2,3,7,8,12,13,17,18-octabromoporphyrinate)manganese(III) (cis/trans-MnBr8P2) were obtained from their second-generation analogues (MnP1 and cis/trans-MnP2). These four catalysts were used in cyclohexane oxidation reactions with iodosylbenzene (PhIO) or iodobenzene diacetate (PhI(OAc)2) in the presence or absence of solvent (CH2Cl2). Cyclohexanol (Cy-ol) and cyclohexanone (Cy-one) were the sole reaction products. Regardless of the system, third-generation catalysts MnBr8P1 and cis/trans-MnBr8P2 performed better than second-generation catalysts (MnP1 and cis/trans-MnP2, respectively). In solvent systems, cis/trans-MnBr8P2 afforded a greater total yield (%Cy-ol +%Cy-one) than systems using MnBr8P1, with an increase from 80 to 89% in PhIO and from 47 to 57% in PhI(OAc)2. The systems without solvent, showed to be viable and presented significant yields with PhIO as oxidant, with total yield of 30% for MnBr8P1, and 55% for cis/trans-MnBr8P2. Additionally, in systems with third-generation catalysts without solvent, selectivity was close to 100% for Cy-ol.

    更新日期:2017-12-15
  • Effect of L-threonine on Growth and Properties of Ammonium Dihydrogen Phosphate Crystal
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-13
    J.H. Joshi, S. Kalainthan, D.K. Kanchan, M.J. Joshi, K.D. Parikh

    Ammonium dihydrogen phosphate (ADP) is an important nonlinear optical (NLO) material used for electro-optical applications and finds various NLO applications using Nd: YAG and Nd: YLF Lasers. The Amino acids have properties like molecular chirality and zwitter ionic nature helps to improve NLO properties of ADP. The pure and L-threonine doped ADP crystals are grown using slow solvent evaporation technique at room temperature. The Powder XRD spectra suggest tetragonal crystal system and slit shifting of peak. The FT-IR spectra verify the presence of various functional groups of pure and doped ADP crystals. The FT-Raman shows strong absorption peak at 922 cm-1due to asymmetric stretching of PO43- for all samples without shifting indicating the single phase nature of all samples. The photoluminescence study suggests the presence of defects in doped samples compared to the pure one due to increase of Stokes shift and vibrational energy relaxation phenomena. The presences of constituent elements are indentified using CHN analysis. The optical transmittance, energy band gap, skin depth, refractive index and extinction coefficient is study using UV-Visible spectroscopy and the dispersive behaviour of refractive index below absorption edge is study using Wemple-DiDomenico single oscillator model. The variation of capacitance and conductance is study using complex admittance spectroscopy. All the grown crystals possess negative photoconductivity. The second and third harmonic generation efficiency is increases nearly to double for L-threonine doped ADP crystals compared to pure Potassium dihydrogen phosphate (KDP). The laser damage threshold is measure for pure and doped ADP crystals.

    更新日期:2017-12-14
  • Preparation of porous hybrid adsorbents based on fluor(calcium silicate)/activated carbon and its application in the removal of iron (III) from ammonium phosphate solutions
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-13
    Xin-hua Zhu, Jun Li, Yang Jin, Yun-hai Guo

    The high concentration of Fe3+ ions present in ammonium phosphate solutions have a significant effect on product quality and product morphology. Herein, hybrid adsorbents fluor(calcium silicate)/activated carbon (FCS/AC) combined with fluor(calcium silicate) (FCS) and activated carbon (AC) were prepared, characterized, and applied in the removal of Fe3+ ions from ammonium phosphate solutions. FCS/AC held both advantages of FCS and AC indicating a significant adsorption for Fe3+ ions. The adsorption kinetics, isotherms and thermodynamics of Fe3+ onto FCS/AC were investigated. The effect of solution pH, initial Fe3+ concentration, temperature and contact time on the adsorption of Fe3+ onto FCS/AC were also investigated. Desorption-resorption experiments of FCS/AC for Fe3+ ions were examined by the batch method using different eluents. The results showed that FCS/AC was an excellent, low cost and reusable adsorbent for the removal of Fe3+ ions from ammonium phosphate solutions, and the adsorption process appeared to follow the pseudo-second-order kinetic model and Langmuir isotherm model with a maximum Fe3+ adsorption of 15.41 mg/g. Various thermodynamic parameters such as △G0, △H0 and △S0 were calculated indicating the feasibility of the process and spontaneous nature of the adsorption.

    更新日期:2017-12-14
  • Understanding the Adsorption of newly Benzylidene-aniline derivatives as a Corrosion Inhibitor for Carbon steel in Hydrochloric acid solution: Experimental, DFT and Molecular Dynamic Simulation Studies
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-11
    M.E. Belghiti, S. Bouazama, S. Echihi, A. Mahsoune, A. Elmelouky, A. Dafali, K.M. Emran, B. Hammouti, M. Tabyaoui

    Corrosion inhibition of carbon steel in hydrochloric acid solution was inspected using newly Benzylidene-aniline derivatives namely: (E)-N(2-Chlorobenzylidene)-2-Fluorobenzenamine (NCF) and (E)-N(2-Chlorobenzylidene)-3-Chloro-2-Methylbenzenamine (NCCM), by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The experimental results showed that both NCF and NCCM are good inhibitors for carbon steel in 1M HCl.The inhibition efficiency increases with inhibitors concentration rise, reaching a value up to 89.72% at 10-3 M for the inhibitor NCF. Electrochemical impedance data show a frequency distribution of the capacitance, simulated as constant phase element (CPE). Polarization curves study revealed that both inhibitors are mixed type. The adsorption on the carbon steel surface follows Langmuir isotherm model with negative values of View the MathML source Δ G ads 0 .Thermodynamics data for the adsorption process are calculated and discussed.The effect of molecular structure on inhibition efficiency was investigated by quantum chemical calculations using density function theory (DFT). Furthermore, Monte Carlo simulation technique incorporating molecular mechanics and molecular dynamic was applied to search for the best configurationally space for (NCCM or NCF)/100H2O/α-Fe2O3(111) systems. The results indicate that the adsorption energy of NCF was greater than NCCM which is in accordance with the experimentally determined inhibition efficiency.

    更新日期:2017-12-14
  • Synergism of thiocyanate ions and microinterfacial surface as driving forces for heavy multi-metals extraction
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-09
    Daniela Cadar, Nicoleta Liliana Olteanu, Elena Adina Andrei, Adina Roxana Petcu, Cosmina Andreea Marin, Aurelia Meghea, Maria Mihaly

    A comprehensive study has been carried out to evaluate the extraction of heavy metals mixture (Co2+, Cr3+, Cu2+, Ni2+) from aqueous media by Winsor II non-ionic microemulsion, containing polyoxyethylene (4) lauryl ether as non-ionic surfactant and butyl acetate as organic phase. The extraction mechanism is based on the formation of thiocyanate complexes of metals and their transfer from aqueous to microemulsion phase, either towards the interfacial film of surfactant (Co2+) or into the core of micelles (Cr3+, Cu2+, Ni2+). The value of the distribution coefficient for Co2+ was higher than for the other studied metals and its extraction efficiency was not dependent on the working conditions, showing a maximum value (99.99%) in all cases. By using successive extractions, chromium, nickel and copper ions that remained in the aqueous phase after first extraction were transported into the microemulsion phase, leading to an increase in the extraction efficiency up to 99.99% for chromium and copper, and 85% for nickel. Based on pH influence, a selective extraction of Co2+ and Cr3+ can be achieved, since the cobalt ions were completely extracted into the microemulsion phase at pH = 1, and the chromium ions still remained in the aqueous phase.

    更新日期:2017-12-14
  • Ganoderma applanatum-mediated green synthesis of silver nanoparticles: structural characterization and in vitro and in vivo biomedical and agrochemical properties
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-08
    Sudisha Jogaiah, Mahantesh Kurjogi, Mostafa Abdelrahman, Hanumanthappa Nagabhushana, Lam-Son Phan Tran

    This study presents the use of basidiomycete extracts as an effective platform for “green synthesis” of silver nanoparticles (AgNPs). Out of seven basidiomycete species, Ganoderma applanatum displayed the highest antimicrobial properties against the tested pathogens. Thus, G. applanatum methanol crude extract was fractionated using column chromatography, and the obtained fractions were subjected to an antimicrobial assay followed by phytochemical analyses using high-performance liquid chromatography to select the best fraction for synthesis of AgNPs. Fraction 3 displayed potent antimicrobial activities as evidenced by its high phenolic content, and thus was used for AgNP biosynthesis. The G. applanatum fraction 3-synthesized AgNPs were then characterized using various microscopy, spectroscopy and X-ray diffraction techniques. The characteristic features of the synthesized AgNPs indicated the spherical shape of AgNPs with an average size of 20-25 nm. The synthesized AgNPs exhibit high antioxidant capacity, in vitro antibacterial activity against Staphylococcus aureus and Escherichia coli, and in vivo antifungal properties against Botrytis cinerea and Colletotrichum gloeosporioides in tomato and strawberry leaflet assays, respectively. Our results demonstrated that G. applanatum can be efficiently used in synthesis of AgNPs with potent antimicrobial properties, which can be used for both clinical and agrochemical purposes.

    更新日期:2017-12-14
  • Remarkable effect of L-Ascorbic acid on crystal morphology, structural, crystalline perfection, optical, Photoluminescence and dielectric properties of Zinc(tris) thiourea sulphate (ZTS) single crystals
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-08
    Mohd. Shkir, V. Ganesh, S. AlFaify, I.S. Yahia, K.K. Maurya

    Large size growth of Zinc(tris) thiourea sulphate (ZTS) crystals has been successfully done through slow evaporation technique in presence of L-Ascorbic acid (LAA). The possibility of any extra phase due to presence of LAA was ruled out through structural analysis. The deviation in lattice parameters and shift in peaks position indicates the interaction of LAA with ZTS. Crystalline perfection of grown crystals was judged by High-resolution X-ray diffraction (HRXRD) study and found that the crystalline perfection of ZTS in presence of 10 wt% LAA is enhanced compared to others. The low optical absorbance and high band gap confirms its application in optoelectronic devices. A burly blue emission band at 460 nm was observed in Photoluminescence spectra of ZTS crystals grown in presence of LAA when excited at 310 and 358 nm both. However, when these specimens were excited at 385 nm this blue emission band is observed at 470 nm. The remarkable enhancement of blue band emission intensity was noted which may be attributed due to presence of defects (color centers). Further the dielectric measurement was done and shows that the dielectric constant has been improved due to presence of dye. The enhanced optical band gap, photoluminescence intensity and dielectric constant suggests that the LAAZTS single crystals are suitable for electro-optic device applications.

    更新日期:2017-12-14
  • Directly grown of 3D-Nickel oxide nano flowers on TiO2 nanowire arrays by hydrothermal route for electrochemical determination of naringenin flavonoid in vegetable samples
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-08
    M. Siva Prasad, R. Chen, Hongwei Ni, K. Kiran Kumar

    A novel an electrochemical sensor is constructed based on three-dimensional Nickel oxide nano flowers (3D-NiO) and TiO2-nanowire arrays (TiO2NWA) by hydrothermal route. Initially TiO2-NWA were produced on titanium foil using hydrothermal method in the presence of 1.0 M NaOH solution at 180°C for 20 h, then 3D-nickel oxide nano (NiO) flowers (up to 3 µM) are directly grown on TiO2 NWA using hydrothermal reaction in the presence of glucose, urea and nickel acetate mixer solution at 150°C for 5h, followed by N2 gas assisted annealing at 500°C for 2h. The resultant nanostructures are characterized by CV, XRD, FESEM-EDX and TEM. The as prepared electrodes are used as electrochemical sensors for investigating electrochemical behavior of naringenin (NRG) flavonoid. Further differential pulse voltammetry is used to determine the NRG in vegetable (tomato and ginger) samples at optimized conditions, such as accumulation potential, time, the applied sample volume, pH of the buffer and the step potential. The finest oxidation peaks are observed for NRG in acidic condition (phosphate buffer solution) at around 0.35 V. The obtained oxidation peaks were observed at low current values over the concentration of 1.50×10-8 M to 2.35×10-4 M with lower detection limit of 0.025 nM for NRG. Mainly the presence of carbon (glucose) enhanced the conductivity and surface area of the as prepared electrode (NiO/TiO2NWA). The nano composite modified electrode (NiO/TiO2NWA) displays good stability, high sensitivity and reproducibility. The recommended method is effectively applied an economical and simple sensor for the present investigation.

    更新日期:2017-12-14
  • N-haloacetyl phenothiazines and derivatives: Preparation, characterization and structure-activity relationship for antifungal activity
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-05
    Gabriela P. Sarmiento, M. Florencia Martini, Roxana G. Vitale, Lucas E. Fabian, Javier Afeltra, Daniel Vega, Graciela Y. Moltrasio, Albertina G. Moglioni
    更新日期:2017-12-14
  • Design and development a novel uranyl sensor based on FePt/ZnIn2S4 core-shell semiconductor nanostructures
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-02
    Hossein Zeynali, Mohammadhassan Motaghedifard, B.F.O. Costa, Hossein Akbari, Zohreh Moghadam, Morteza Babaeianfar, Mohammad Javad Rashidi

    In this study, the FePt core, ZnIn2S4 shell and FePt-ZnIn2S4 core-shell nanostructures were successfully synthesized using solvothermal process. Temperature dependent hysteresis behavior of as-synthesized nanoparticles (NPs) FePt and FePt/ZnIn2S4 showed super paramagnetic response at 300 K and ferromagnetic properties with a coercive field (Hc) of 2830 Oe and 970 Oe at 2 K, respectively. Also, the blocking temperature (TB) estimating by the peak in ZFC curves was about 26 K for FePt and about 46 K for FePt/ZnIn2S4 NPs. After the identification process of nanostructure, using electrochemical methods, the behavior of FePt-ZnIn2S4 core-shell@PGE was studied in 0.1 M phosphate buffer solution (PBS) containing 5.0 mM [Fe(CN)6]3−/4−. The EIS complex plane plots showed a drastic change in the charge transfer resistance of the probe redox reaction as a function of UO22+ concentration. This behavior was used for construction of the calibration curve, and a linear range from 0.5 to 10.0 μM UO22+ with a detection limit of 71.7 nM.

    更新日期:2017-12-14
  • Enhanced Sunlight driven photocatalytic performance and visualization of latent fingerprint by green mediated ZnFe2O4 –RGO nanocomposite
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-02
    V.S. Amrutha, K.S. Anantharaju, D.S. Prasanna, Dinesh Rangappa, Krushitha Shetty, H. Nagabhushana, K. Ashwini, Y.S. Vidya, G.P. Darshan
    更新日期:2017-12-14
  • Carnivorous plants used for green synthesis of silver nanoparticles with broad-spectrum antimicrobial activity
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-02
    Rafal Banasiuk, Marta Krychowiak, Daria Swigon, Wojciech Tomaszewicz, Angelika Michalak, Agnieszka Chylewska, Magdalena Ziabka, Marcin Lapinski, Barbara Koscielska, Magdalena Narajczyk, Aleksandra Krolicka

    In this study, we exploit the anti-oxidative potential of four carnivorous plants to produce uniform and biologically active silver nanoparticles. The use of polyvinylpyrrolidone promoted synthesis of quasi-spherical nanoparticles characterized by stability and high uniformity. Their activity was tested against three human pathogens and three species of plant pathogenic bacteria. The study demonstrates the influence of synthesis method (microwave irradiation or heat radiation) and plant extract composition on nanoparticle activity. The total anti-oxidative potential of the plant extract, as well as the applied method of silver ions reduction proved to be crucial for antimicrobial activity. The highest minimal bactericidal concentration (mean value = 10 µg/mL) was obtained for silver nanoparticles synthesized with the use of water extract from Dionaea muscipula tissue.

    更新日期:2017-12-14
  • Nanocomposites based on cationic polyelectrolytes and silver nanoparticles: Synthesis, characterization, molybdate retention and antimicrobial activity
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-01
    Manuel Palencia, Alexander Córdoba, Manuel F. Melendrez

    The objective of this work was to synthesize nanocomposites based on cationic polyelectrolytes and silver nanoparticles using poly(N-vinylbenzyl-N-triethylammonium chloride) as polymer phase. For that, a nanostructured crosslinker was synthesized from silver nanoparticles (AgNPs) and acrylic acid. Molybdate retention properties of nanocomposites were studied in function of pH and ionic strength. In addition, their antimicrobial properties were evaluated against E. coli and S. aureus. It was evidenced that AgNPs can be stabilized using acrylic acid and that this material can be incorporated to the polymer phase during polymerization by free radical of cationic monomers. The effect of pH on retention of molybdate, by the nanostructured polymer, was significant only to low ionic strength (the order seen was pH 5.0 > pH 7.0 > pH 9.0 for 0.0% NaCl). Results suggest that the main interaction influencing the molybdate retention is electrostatic in nature. Finally, antimicrobial activity was enhanced by incorporation of polymerizable nanostructured crosslinker based on AgNPs.

    更新日期:2017-12-14
  • Influence of different 3-D electrodes towards the performance of gold recovery by using an electrogenerative process
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-28
    Nurul Ashikin Roslan, Faiz Bukhari Mohd Suah, Norita Mohamed

    In this study, gold was recovered by using an electrogenerative process employing a batch cell. This system is based on Galvanic cell which it does not require any external power supply but it produces an electrical energy by a spontaneous chemical reaction in which gold is reduced at cathode and zinc is oxidized at anode. The performances of three-dimensional electrodes, reticulated vitreous carbon (RVC) and porous graphite sheet (PG) were used as cathodes and investigated based on the time and percentage of gold recovery. In batch cell system, RVC served as the best cathode material, having the highest recovery rate with >99% of gold being recovered in 1 h operation for gold concentration of 100 mg L−1. Cyclic voltammetry and mass transfer studies were conducted to study the characteristics of these cathodes for gold deposition. Based on the cyclic voltammograms, RVC and PG undergoes redox reaction within range 1200 mV to −600 mV. Finally, based on the cyclic voltammograms, it was found that gold reduction was observed at 0.2–0.1 V of potential range while oxidation peak was occurred at a potential range between 0.8 and 1.0 V.

    更新日期:2017-12-14
  • Selenotriapine – An isostere of the most studied thiosemicarbazone with pronounced pro-apoptotic activity, low toxicity and ability to challenge phenotype reprogramming of 3-D mammary adenocarcinoma tumors
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-28
    Nenad R. Filipović, Snežana K. Bjelogrlić, Sveva Pelliccia, Vesna B. Jovanović, Milan Kojić, Milan Senćanski, Giuseppe La Regina, Romano Silvestri, Christian D. Muller, Tamara R. Todorović

    Triapine, the most studied α-N-heterocyclic thiosemicarbazone, revealed potent activity against advanced leukemia, but was ineffective against a variety of solid tumors. Moreover, methemoglobinemia, which is a side effect of triapine administration, may limits all clinical application. To enhance anticancer activity and reduce side effects, we applied an isosteric replacement of sulfur to selenium atom was performed by synthesis and characterization of selenium triapine analog, 3-aminopyridine-2-carboxaldehyde selenosemicarbazone (selenotriapine). Compared to triapine, selenotriapine revealed superior pro-apoptotic activity with activation of intrinsic apoptotic pathway in both human monocytic leukemia (THP-1) and mammary adenocarcinoma (MCF-7) cell lines. For MCF-7 2-D cultures, selenotriapine induced notable increase in mitochondrial superoxide radical generation and dissipation of mitochondrial transmembrane potential. A significant delay in growth of MCF-7 spheroids (3-D culture) was accompanied by phenotypic stem cell reprogramming (Oct-4 expression). Additionally, selenotriapine demonstrated a very low toxicity profile as compared to triapine, confirmed over alleviated extent of methemoglobin formation and higher IC50 value in brine shrimp cytotoxicity assay.

    更新日期:2017-12-14
  • Fabrication of β-cyclodextrin and sialic acid copolymer by single pot reaction to site specific drug delivery
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-24
    Parbeen Singh, Xiaohong Ren, Yaping He, Li Wu, Caifen Wang, Haiyan Li, Vikramjeet Singh, Jiwen Zhang

    The fabrication of supramolecular host in combination biomolecules is an interesting idea in modern drug delivery for development of new polymer with advanced chemical and biological properties. Herein, hyper-crosslinked copolymer was fabricated from β-cyclodextrin (β-CD) and sialic acid (SA) monomers, which can be undoublty considered as a new class of copolymer. The as-synthesized copolymer has complexation properties, which could cover the drug within the structure and deliver to the site of action. The well-known inclusion capability of β-CD and targeted efficacy of SA made it more appropriate for targeted drug delivery. The copolymer was characterized using a wide range of spectroscopic and microscopic techniques such as synchrotron radiation based FTIR spectroscopy (SR-FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and powder X-ray diffraction (PXRD). The surface area and porosity were calculated by using Nitrogen adsorption method. Doxorubicin (Dox) was selected as a model drug to evaluate the loading efficiency and cellular penetration ability of the copolymer. The copolymer showed high adsorption towards Dox with no significant cytotoxic effects on HeLa cells as proved by cell viability assay. High cellular penetration of Dox loaded copolymer was also recorded by confocal microscopy when compared with free Dox in HeLa cells at 4 h of exposure. Thus, β-CD-SA copolymer could be a useful carrier for targeted drug delivery of cancer and has the potential for further investigation in viral and nervous disease due to the targeting ability of SA.

    更新日期:2017-12-14
  • Green synthesis and fabrication of an electrochemical and colorimetric sensor based on self-assembled peptide-Au nanofibril architecture
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-24
    Wensi Zhang, Jundan Xi, Yongcao Zhang, Zhiqiang Su, Gang Wei

    Owing to the excellent self-assembly properties and chemical flexibility, amyloid peptide were employed to build multifunctional architectures. Herein, we demonstrated the self-assembly of gold nanoparticles (AuNPs) in assistant of a sequence-designed peptide. As both surface ligands and self-assembly scaffolds of AuNPs, the formation of amyloid peptide nanofibrils could drive the self-assembly of AuNPs to form a fibrous hybrid architecture, which exhibits excellent electrochemical and colorimetric sensing performances. As a result, the electrochemical sensing towards H2O2 achieved a linear response range of from 0.1 to 25.85 mM (R2 = 0.997), and the detection limit was calculated to be 3.43 μM (S/N = 3). This self-assembled nanofiber was also employed for Hg2+ detection. The sensor produced a color change which can readout with naked eye and UV–visual spectroscopy, with a linear detection range of 10–70 μM of Hg2+ ion sample (R2 = 0.991).

    更新日期:2017-12-14
  • Lanthanum oxide nanoparticles immobilized reduced graphene oxide polymer brush nanohybrid for environmental vitiation of organic dyes
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-21
    Navin Kumar Mogha, Saransh Gosain, Dhanraj T. Masram

    In the present work, uniformly distributed Lanthanum Oxide nanoparticles on poly (tetrahydrofurfuryl methacrylate) brushes spread over the surface of reduced graphene oxide (La2O3/PTHF/rGO) are synthesized. La2O3/PTHF/rGO is used as catalyst for the degradation of Rhodamine B (RhB), Methyl Orange (MO) and Eosine Y (ESY) dyes. Catalyst has shown excellent catalytic activity as evident by the apparent Rate constant (kapp), which is found to be 26.8, 28.6, and 20.5 (×10−3 s−1), for RhB, MO and ESY respectively, much higher than the reported in literature. The catalyst is recycled for five times without any significant loss in its activity, which makes it suitable for the applications in catalysis and waste water management.

    更新日期:2017-12-14
  • A highly active copper-based metal-organic framework catalyst for a friedel–crafts alkylation in the synthesis of bis(indolyl)methanes under ultrasound irradiation
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-21
    Huong T.D. Nguyen, The T. Nguyen, Phuong T.K. Nguyen, Phuong Hoang Tran

    A robust copper-based metal-organic framework (MOF) catalyst, termed MOF-891, was successful applied to the synthesis of the family of bioactive compounds, bis(indolyl)methanes, through a Friedel–Crafts alkylation under ultrasound irradiation. The remarkable catalytic activity of MOF-891 was proven by the successful synthesis of bis(indolyl)methanes in high yield (up to 96%) and purity. In MOF-891, there exist two types of copper clusters, one discrete and one infinite rod, both are formed through water molecules triggering hydrogen bonds demonstrated the participation as catalytic active site for the Friedel–Crafts alkylation reaction. The well-defined construction of hydrogen bonds in MOF-891 along with Lewis copper sites attributed a stable catalysis activity and exhibited the heterogeneous nature with no significant loss of catalytic performance after six cycles.

    更新日期:2017-12-14
  • Chemically functionalized activated carbon with 8-hydroxyquinoline using aryldiazonium salts/diazotization route: Green chemistry synthesis for oxins-carbon chelators
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-21
    Nawader F. AlQadhi, Awadh O. AlSuhaimi

    The past few years witnessed the emergence of aryldiazonium salts as versatile coupling agents for the functionalization of carbon and other substrates. Although the approach has demonstrated extensive applications in many fields, its use for the synthesis of chelating resins has not been explored. In this work, the concept has been exploited to develop an ecofriendly synthetic method for carbon based chelators. Herein, the p-nitroanline aryldiazonium salt was generated (in situ) in presence of hypophosphorous acid and covalently grafted onto activated carbon (AC) to allow addition of 8-hydroxyquinoline (8-HQ) via diazo coupling. The successfulness of the functionalization was confirmed by DRIR, XPS, and TGA. The risen was packed into cartridges and used with standard solid phase extraction (SPE) apparatus for the extraction of trace metals; Cd(II), Ni(II), Mn(II), Zn(II) and Pb(II) from groundwater samples prior to their measurement by ICPMS. The resin exhibited more 50% enhancement in capacity exchange relative to the plain AC. Under the optimum conditions the sorption capacity of the sorbent was 0.393, 0.170, 0.345, 0.092, 0.314 mmol g−1 for Mn(II), Cd(II), Ni(II), Pb(II) and Zn(II) respectively. The sorbent showed efficient performance when applied for SPE of trace metals from groundwater certified reference materials BCR-609 and groundwater real samples from AlMadinah AlMumnawarah, Saudi Arabia.

    更新日期:2017-12-14
  • Phosphoric acid functionalized graphene oxide: A highly dispersible carbon-based nanocatalyst for the green synthesis of bio-active pyrazoles
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-16
    Masoumeh Zakeri, Ebrahim Abouzari-lotf, Mikio Miyake, Shahram Mehdipour-Ataei, Kamyar Shameli

    Carbon-based catalysts are gained significant interest for improving a number of catalytic processes due to their unique set of benefits. However, a few of such catalysts are proper for synthesis of organic compounds in water. Therefore, there is a strong need for developing water-tolerant and dispersible catalysts. Here, we demonstrate a simple and efficient method for the preparation of highly dispersible phosphonic acid functionalized carbocatalyst. The applied functionalization method was flexible in controlling the functionalization level. The prepared nanocatalyst exhibited superior catalytic performance toward multicomponent synthesis of pyrano[2,3-c]pyrazole, with 80–90% yield within 15 min in water. Moreover, this water-tolerant solid acid catalyst could be simply retrieved and after 6 successive cycles of reactions, the reaction time and yield still keeps within the same level.

    更新日期:2017-12-14
  • Tandem chalcone-sulfonamide hybridization, cyclization and further Claisen–Schmidt condensation: Tuning molecular diversity through reaction time and order and catalyst
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-16
    Mirian R.C. de Castro, Raquel Ferreira Naves, Aline Bernardes, Cameron Capeletti da Silva, Caridad Noda Perez, Andrea Felinto Moura, Manoel Odorico de Moraes, Felipe Terra Martins

    We here report the synthesis of novel chalcone-sulfonamide compounds based on the hybridization at 2′ position and nitro substitution at the side chalcone phenyl ring followed by tandem cyclization into quinolinone derivatives and then a further aldol condensation only as a function of the reaction time. Therefore, for the first time, we have controlled the sequential preparation of chalcone-sulfonamide hybrids, quinolinones and then (E)-3-ene-2,3-dihydroquinolinones simply stopping reaction over increasing time periods. Furthermore, a new molecular scaffold based on a chalcone-(bis)sulfonamide hybrid has been gotten through changing the sequence of coupling reactions and catalyst. This study means practical and useful ways of constructing in high yields new biologically active compounds bearing diversified molecular scaffolds.

    更新日期:2017-12-11
  • High resolution LC-MS characterization of phenolic compounds and the evaluation of antioxidant properties of a tropical purple radish genotype
    Arab. J. Chem. (IF 4.553) Pub Date : 2017-11-16
    Tanmay Kumar Koley, Zareen Khan, Dasharath Oulkar, B.K. Singh, Arti Maurya, B. Singh, Kaushik Banerjee

    This study reports qualitative profiling of the phenolic compounds in an indigenously developed purple radish genotype VRRAD-151 using ultra performance liquid chromatography with quadrupole time of flight mass spectrometry. The root and leaf samples were harvested at the horticultural maturity stage of the genotype. Roots were divided into the periderm, and xylem, and the leaf samples were divided into petiole, and lamina, and these were separately extracted with methanol before the LC-MS analysis. A total of 66 compounds, including 23 flavonols, 1 dihydroflavonols, 4 flavonones, 4 flavones, 28 anthocyanins, 2 isoflavonoids, 3 phenolic acids, and 1 hydroxybenzaldehyde were putatively identified based on high resolution accurate mass analysis with the data processing through UNIFI®, which is a comprehensive compound identification software solution. An in-house developed database comprising the secondary metabolites of polyphenols was used for the screening purpose, and each phenolic compound was identified based on the detection of the precursor ion, and at least one characteristic fragment ion, each with less than 5 ppm of mass error. Anthocyanins were the most abundant type of phenolics exhibiting 59% in leaf petiole, 80% in root periderm, and 90% in root xylem. The relative concentration of anthocyanins was lower (11%) in the leaf lamina. Cyanidins were the most predominant anthocyanins accounting for 54, 100, 90 and 65%, in leaf lamina, leaf petiole, root periderm and root xylem, respectively. Eight anthocyanins and 25 flavonols (except kaempferol-3-O-p-coumaryl-shophoroside-7-O-glucoside) are tentatively new identifications and reported for the first time in radish. Flavonols were found to be the predominant group of phenolic compounds in the leaf lamina, and interestingly, the gradient of antioxidant activity followed the (relative) concentration gradient of flavonols in the samples. The relative antioxidant activity of various fractions when compared with each other, followed the trend: leaf lamina > root periderm > leaf petiole ≈ root xylem. Based on the results it can be reflected that this genotype can be utilized as a functional food for management of various human and animal diseases. Since the detected anthocyanins were mostly present in acylated forms, this genotype can function as a potential source of stable natural colorants.

    更新日期:2017-12-11
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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