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  • 更新日期:2018-01-18
  • Life Cycle Assessment of Polyol Fuel from Corn Stover via Fast Pyrolysis and Upgrading
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-18
    Lijun Heng, Huiyan Zhang, Jun Xiao, Rui Xiao
    更新日期:2018-01-18
  • Stainless Steel Scrubber: A Cost Efficient Catalytic Electrode for Full Water Splitting in Alkaline Medium
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Sengeni Anantharaj, Shubham Chatterjee, Karukkampalayam C. Swaathini, Thangavel S. Amarnath, Elangovan Subhashini, Deepak Kumar Pattanayak, Subrata Kundu
    更新日期:2018-01-18
  • Facile synthesis of dimethyl succinate via esterification of succinic anhydride over ZnO in methanol
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Xinyan Wan, Dezhang Ren, Yunjie Liu, Jun Fu, Zhiyuan Song, Fangming Jin, Zhibao Huo

    An efficient esterification of succinic anhydride (SA) to dimethyl succinate (DMS) using ZnO in methanol was investigated for the first time. ZnO is commercial, low cost, non-corrosive and environmentally friendly metallic oxide and can promote remarkably the production of DMS from SA in excellent yields with high selectivity. The highest yield of DMS of 100% was achieved at the temperature of 140 oC for 10 h. The results indicated that reaction temperature and time had significant influences on the yield of DMS. Mechanism study found that ZnO was first dissolved to form a Zn species, and then redeposited to ZnO during the reaction, which was crucial for SA conversion. The redeposited ZnO could be reused at least 4 times without the loss of the activity. Moreover, the reaction of ethanol and SA was also effective to give excellent yield at the optimal conditions. The present study demonstrates a promising greener way for the synthesis of DMS from biomass-derived SA.

    更新日期:2018-01-18
  • Utilization of Sweet Sorghum Juice for the Production of Astaxanthin as a Biorefinery Co-Product by Phaffia rhodozyma
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Ryan Stoklosa, David Johnston, Nhuan Nghiem

    This work investigates cultivating the red-pigmented yeast Phaffia rhodozyma in sweet sorghum juice (SSJ) to assess the production of astaxanthin as a potential biorefinery co-product. Shake flask cultures on defined sugar medium indicated that all three sugars (sucrose, glucose, and fructose) could be consumed with adequate nitrogen and nutrient supplementation. Only modest biomass growth and astaxanthin production could be achieved in SSJ without nitrogen supplementation; however, combining nitrogen supplementation with yeast extract in diluted SSJ could metabolize all sugars present in 168 hours. A 2 L bioreactor trial with full strength (i.e. undiluted) SSJ produced up to 29 g/L of biomass, 65.4 mg/L of astaxanthin, an overall cell astaxanthin content of 2.49 mg astaxanthin/g dry cell mass, and a volumetric astaxanthin productivity of 0.389 mg/L/hr after 168 hours of cultivation. Further process optimization is needed since glucose metabolism was incomplete in undiluted SSJ.

    更新日期:2018-01-18
  • Mechanochemical Oxidation and Cleavage of Lignin β-O-4 Model Compounds and Lignin
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Saumya Dabral, Hermann Wotruba, Jose G. Hernandez, Carsten Bolm

    A mechanochemically oxidation and cleavage reaction in lignin β-O-4 model compounds and lignin catalyzed by HO–TEMPO/KBr/Oxone® has been developed under milling conditions. The studies on non-phenolic lignin β-O-4 model compounds led to selective oxidations of the benzylic hydroxyl groups. Complementary, subjecting phenolic lignin model compounds to the oxidative conditions in a ball mill initiated aryl–Cα bond cleavage reactions leading to the formation of the corresponding quinones and phenol derivatives. Transferring the mechanochemical protocol to lignin resulted in the simultaneous oxidation and cleavage of bonds with varied selectivity for monomeric products. Finally, a scale-up approach of the oxidative procedure by using vibrating disc mill technology enabled the mechanochemical protocol to be applied in gram-scale batch reactions under reduced milling time, while affording similar extent of oxidation.

    更新日期:2018-01-18
  • Electrically conducting carbon microparticles by direct carbonization of spent wood pulping liquor
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Janea Köhnke, Harald Rennhofer, Helga C. Lichtenegger, Arunjunai Raj Mahendran, Christoph Unterweger, Batirtze Prats-Mateu, Notburga Gierlinger, Elisabeth Schwaiger, Arnulf Kai Mahler, Antje Potthast, Wolfgang Gindl-Altmutter

    Lignin is produced abundantly in wood pulping. Being currently mainly used for the generation of process energy and electrical energy by combustion, its isolation from processing liquor and subsequent purification for potential higher value uses is challenging. Therefore, the present study evaluates the feasibility of direct carbonization of spray-dried processing liquor from two relevant industrial pulping processes with the aim of obtaining electrically conducting carbon. Analysis of the carbonization process reveals significant differences in the thermal stability of spray-dried liquor from a Sulphite pulping process compared to Kraft liquor. As a result, Kraft-derived carbon shows highly ordered graphitic structure and good electrical conductivity comparable to carbon black, whereas Sulphite liquor derived carbon only shows modest conductivity.

    更新日期:2018-01-18
  • Novel colorimetric nanosensor based on the aggregation of AuNP triggered by carbon quantum dots for detection of Ag+ ions
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Feiyang Wang, Yuexiang Lu, Ying Chen, Jingwei Sun, Yueying Liu

    A novel colorimetric nanosensor based on stable aggregation of gold nanoparticle (AuNP) triggered by carbon quantum dots (CDs) has been developed for detection of Ag+ ions in the presence of glutathione (GSH). Firstly, the nanosensor is constructed by assembling carbon quantum dots (CDs) ‘shell’ on the surface of gold nanoparticle (AuNP), resulting in the generation of the stable aggregation of CDs/AuNP. The solution color changes from red to blue. In the absence of target, the addition of GSH into the aggregated CDs/AuNP exhibits the dispersion state corresponding to the color change from blue to red, because GSH can prefer to binding with AuNP comparing with CDs. On the contrary, the aggregated CDs/AuNP has been again observed with the color change from red to blue after the target analyte Ag+ ions are added. Therefore, the new sensing strategy based on ‘aggregation-dispersion-aggregation’ or ‘blue-red-blue’ mode can be established for Ag+ detection. This method can selectively detect Ag+ in a linear range from 100 nM to 4000 nM with the detection limit of 50 nM. It is successfully applied to determination of Ag+ ions in tap water and drinking water. Our study will expand a new sight for application of CDs in sensors, environmental monitoring and preparation of carbon-based nanomaterials.

    更新日期:2018-01-18
  • From Phase Change Materials to Green Solvents: Hydrophobic Low Viscous Fatty Acid-based Deep Eutectic Solvents
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Catarina Florindo, Leila Romero, Ignacio Rintoul, Luis Branco, Isabel M. Marrucho

    Inspired by the use of fatty acids in development of low temperature latent heat storage materials, novel low viscous and hydrophobic deep eutectic solvents (DESs) based exclusively on fatty acids are herein proposed as sustainable solvents. Three DESs were prepared by exclusively combining fatty acids, namely octanoic acid (C8), nonanoic acid (C9), decanoic acid (C10) and dodecanoic acid (C12), which can simultaneously act as hydrogen bond donors and acceptors. The obtained fatty acid-based DESs were analyzed in order to check their structures, purities and proportions. Water stability was also carefully evaluated through 1H NMR. Fatty-acid DESs melting point’s diagrams were determined by visual observation. Good agreement was obtained between the experimental eutectic point and that predicted by considering an ideal system of two individually melting compounds. Important solvent thermophysical properties, such as density and viscosity of the dried and water-saturated DESs were measured. Finally, the removal of bisphenol-A, a persistent micropollutant present in aqueous environments illustrates the potential of binary and ternary fatty acid-based DESs as extraction solvents. All prepared DESs showed good ability to extract bisphenol-A from water with extraction efficiencies up to 92%.

    更新日期:2018-01-18
  • Novel eco-friendly Pickering emulsion stabilized by silica nanoparticles dispersed with high-molecular-weight amphiphilic alginate derivatives
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    XinYu Zhao, Gaobo Yu, Jiacheng Li, Yuhong Feng, Lei Zhang, Yang Peng, Yiyuan Tang, Longzheng Wang

    O/W Pickering emulsions formed with silica nanoparticles adsorbed with amphiphilic alginate derivatives produced a longer stability. Ugi-Alg was obtained by a mild and efficient Ugi four-component condensation reaction, and its structure of Ugi-Alg was confirmed by 1H NMR and FT-IR spectroscopies. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) measurements were then performed to characterize the aggregation behavior of SiO2/Ugi-Alg mixture in aqueous solution. The positioning of the silica particles at the oil–water interface was obtained through confocal laser scanning microscopy (CLSM). The long-term stability and rheological property of Pickering emulsions stabilized by Ugi-Alg and SiO2 nanoparticles were respectively investigated by Turbiscan Lab® Expert stability analyzer and rotational rheometer. The rheological behaviors of the emulsions were studied and results showed that Ugi-Alg with high molecular weight led to more rigid structures. This trend can be justified by the formation of silica particle strong network attributed to the entanglement and bridging of Ugi-Alg. The results indicated that adjusting the amount of silica nanoparticles and Ugi-Alg molecular-weight could be a suitable means for manipulating stability of polymer-nanoparticles-based Pickering emulsions. This process would be of great application prospect for the preparation of Pickering emulsions stabilized by sustainable polymer surfactant and nanoparticles.

    更新日期:2018-01-18
  • In Situ Grown AgI/Bi12O17Cl2 Heterojunction Photocatalysts for Visible Light Degradation of Sulfamethazine: Efficiency, Pathway and Mechanism
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Chengyun Zhou, Cui Lai, Piao Xu, Guangming Zeng, Danlian Huang, Chen Zhang, Min Cheng, Liang Hu, Jia Wan, Yang Liu, Weiping Xiong, Yaocheng Deng, Ming Wen

    Visible-light-driven photocatalysts attract great interest because they can utilize more sunlight for reactions than conventional photocatalysts. A novel visible-light-driven photocatalyst AgI/Bismuth oxychloride (Bi12O17Cl2) hybrid was synthesized by hydrothermal-precipitation method. Several characterization tools, such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and UV−vis diffuse reflectance spectroscopy (DRS) were employed to study the phase structures, morphologies, and optical properties of the fabricated photocatalysts. These characterizations indicated that AgI nanoparticles were evenly distributed on the surface of Bi12O17Cl2 and the heterostructures were formed. The photochemical characterizations demonstrated that the promoted separation of carrier transfer in the AgI/Bi12O17Cl2 heterojunction was achieved. The degradation rate of sulfamethazine (SMZ) by AgI/Bi12O17Cl2 was about 7.8 times and 35.2 times higher than that of pristine Bi12O17Cl2 and BiOCl under visible light driven, respectively. It was also found that the amount of AgI in the AgI/Bi12O17Cl2 composites played an important role in photocatalytic activity and the optimized ratio was 25%. The AgI/Bi12O17Cl2 shows good catalytic stability and maintains similar reactivity after four cycles. Furthermore, the degradation intermediates of SMZ were identified by HPLC-MS, and the photocatalytic mechanism was proposed. These findings highlight the role of Bi12O17Cl2 on contaminant elimination and open up avenues for the rational design of highly efficient photocatalysts.

    更新日期:2018-01-18
  • Feasible and Clean Solid-Phase Synthesis of LiNbO3 by Microwave-Induced Combustion and Its Application as Catalyst for Low-Temperature Aniline Oxidation
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Neftali L. V. Carreno, Vinícius G. Deon, Ricardo M. Silva, Luiza R. Santana, Rodrigo M. Pereira, Marcelo O. Orlandi, Wellington M. Ventura, Anderson Dias, Jason G. Taylor, Humberto V. Fajardo, Marcia F. Mesko
    更新日期:2018-01-17
  • One-Step Conversion of Biomass-Derived Furanics into Aromatics by Brønsted Acid Ionic Liquids at Room Temperature
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Lingli Ni, Jiayu Xin, Kun Jiang, Lu Chen, Dongxia Yan, Xingmei Lu, Suojiang Zhang
    更新日期:2018-01-17
  • Optimization of Amidation Reactions Using Predictive Tools for the Replacement of Regulated Solvents with Safer Biobased Alternatives
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Tabitha H. M. Petchey, James W. Comerford, Thomas J. Farmer, Duncan J. Macquarrie, James Sherwood, James H. Clark
    更新日期:2018-01-17
  • Recyclable Carbon Nanofibers@Hierarchical I-Doped Bi2O2CO3–MoS2 Membranes for Highly Efficient Water Remediation under Visible-Light Irradiation
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Jundie Hu, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu
    更新日期:2018-01-17
  • Metal-free and Selective Oxidation of Furfural to Furoic Acid with an N-Heterocyclic Carbene Catalyst
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-17
    Navneet Kumar Gupta, Atsushi Fukuoka, Kiyotaka Nakajima

    Aerobic oxidation of biomass-derived furfural to furoic acid was studied with an N-heterocyclic carbene as a homogeneous catalyst. Carbene species generated in situ on 1,3-bis(2,4,6-trimethylphenyl) imidazolium chloride with a strong organic base (1,8-diazabicyclo[5.4.0]undec-7-ene) was highly active and selective for the formation of furoic acid in dimethyl sulfoxide at 40 °C. This reaction initiates the formation of a Breslow intermediate between an N-heterocyclic carbene and a furfural molecule, and the subsequent activation of molecular O2. While the active carbene catalyst promoted furfural dimerization to afford furoin as a side reaction, furoin was decomposed into the Breslow intermediate and furfural through a reverse reaction, which were then converted quantitatively to furoic acid. Kinetic studies revealed that the apparent activation energy for this furfural oxidation was only 20 kJ mol-1, which is significantly lower than that with a supported Au catalyst (30.4 kJ mol-1). The N-heterocyclic carbene catalyst can oxidize various furan-based aldehydes with high selectivity; however, the electron-withdrawing group bonded to the furan ring has a negative effect on the reaction rate. Furfural can also be oxidized selectively to furoic acid, even in the presence of by-products that are formed by acid-catalyzed dehydration of xylose with Amberlyst-70. As a result, a sequential reaction system based on initial dehydration and subsequent aerobic oxidation was developed for the production of furoic acid from xylose, without the need for furfural purification, using Amberlyst-70 (a solid acid) and an N-heterocyclic carbene catalyst.

    更新日期:2018-01-17
  • Sustainable Process Design Approach for On-Purpose Propylene Production and Intensification
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Ashwin Agarwal, Debalina Sengupta, Mahmoud El-Halwagi
    更新日期:2018-01-17
  • High Li+ ionic flux separator enhancing cycling stability of lithium metal anode
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Rui Jin, Lixin Fu, Hualan Zhou, Zhuyi Wang, Zhengfu Qiu, Liyi Shi, Jiefang Zhu, Shuai Yuan

    The metallic lithium anode provides unparalleled opportunities for rechargeable batteries with very high energy density. A main problem hindering the development of cells using metallic lithium anodes stems from the electrochemical instability of the interface between metallic lithium and organic liquid electrolytes. This paper reports an approach rationally designing the surface characteristic of separator for stable, dendrite-free operation of lithium-metal batteries. A unique polymer multilayer PEI(PAA/PEO)3 was fabricated on the microporous polyethylene (PE) separator by a simple layer-by-layer (LbL) assembly process, which maintains the pore structure and thickness of PE separator but remarkably enhances the ionic conductivity (from 0.36 mS cm-1 to 0.45 mS cm-1) and Li+ transference number (from 0.37 to 0.48), as well as stabilizes lithium metal anodes against the reaction with liquid electrolytes during storage and repeated charge/discharge cycles, which is responsible for restraining the electrode polarization and the formation of lithium dendrites, and therefore endows lithium metal batteries with long-term cycling at high columbic efficiency and excellent rate capability, as well as the improved safety.

    更新日期:2018-01-17
  • An injectable, self-healing and stress sustainable hydrogel of BSA as a functional biocompatible material for controlled drug delivery in cancer cells
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Aekta Upadhyay, Ravinder Kandi, Chebrolu Pulla Rao

    Hydrogels have been utilised in the literature in tissue engineering, drug delivery and as enzyme biomimics. Herein, we report the synthesis of a functional biomaterial using BSA as scaffold and epichlorohydrin as a cross-linker. Our hydrogels were shown by scanning electron micrographs (SEM) to exhibit tunable pore size as a function of BSA concentration and therefore are well suited to encapsulate drug molecules for delivery applications. Our hydrogel is injectable, self-healing, as well it can withstand a physical weight of ~ 300 times of its own. The Dox loading by the gel was confirmed by the emission of red fluorescence. Fibrillar kind of structures are seen in SEM for Dox loaded hydrogels showing the encapsulation of Dox inside the pores of the hydrogel. The controlled release of drug in the phosphate buffer saline medium occurs over 5 days to an extent of 35-40% at pH 5.5 and 20-25% at pH 7.4. Since our hydrogels are made of BSA as matrix, their biocompatibility was proven by MCF-7, HeLa and MDA-MB 231cells wherein 95±5% of cells were found to be viable when treated with unloaded hydrogel. However, the Dox loaded hydrogel results in 70-80% of killing in case of all the three cancer cells. Fluorescence microscopy and FACS studies support controlled and time dependent release of Dox in MCF-7 cells for 24 hours where the drug goes into cytoplasm initially followed by nucleus. The cell cycle analysis carried out using MCF-7 cells clearly showed the cell death due to apoptosis and this is by arresting the G2/M phase as a function of time. All the data supports the utility of the synthesized BSA hydrogel as a biomaterial that will find application in controlled drug delivery.

    更新日期:2018-01-17
  • A Single-Layer TiO2 Film Composed of Mesoporous Spheres for High-Efficiency and Stable Dye-Sensitized Solar Cells
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Yuewu Huang, Haigang Wu, Qingjiang Yu, Jianan Wang, Cuiling Yu, Jinzhong Wang, Shiyong Gao, Shujie Jiao, Xitian Zhang, Peng Wang

    Mesoporous TiO2 spheres with high crystallinity and large specific surface area were facilely prepared via sol-gel and solvothermal methods. By tuning the time and temperature of the solvothermal process, the specific surface area and pore size of TiO2 spheres were fine-controlled without any additives. Compared with the dye-sensitized solar cell (DSC) based on the commercial P25 nanoparticles, the dye-sensitized solar cell employing optimized TiO2 spheres achieves an excellent efficiency of 10.3%, due to the outstanding dye loading and light scattering abilities as well as attenuated charge recombination. Furthermore, an impressive efficiency of 11.2% can be obtained after TiCl4 post-treatment. More importantly, in combination with a single-layer TiO2 film composed of mesoporous spheres and low-volatility electrolyte, the DSC exhibits high a efficiency and long-term durability.

    更新日期:2018-01-17
  • Activation of Persulfates Using Siderite as a Source of Ferrous Ions: Sulfate Radical Production, Stoichiometric Efficiency, and Implications
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Yong Feng, Deli Wu, Hailong Li, Jianfeng Bai, Yi-bo Hu, Chang-Zhong Liao, Xiao-yan Li, Kaimin Shih

    Ferrous ions (Fe2+) rapidly activate persulfates to produce sulfate radicals. However, the high reactivity of Fe2+ towards sulfate radicals means that they are easily scavenged, which reduces the stoichiometric efficiency of persulfates. To improve the stoichiometric efficiency, siderite was used to activate peroxydisulfate (PDS) and peroxymonosulfate (PMS), with phenol as a model contaminant. Near-100% degradation of phenol was achieved by siderite-activated PDS or PMS. In contrast, only 34% and 25% of the phenol was degraded by Fe2+- and nanoscale-magnetite-activated persulfates, respectively. The stoichiometric efficiencies of PMS and PDS activated by siderite were more than 4.4 and 3.6 times higher, respectively, than those activated by Fe2+. Electron paramagnetic resonance recorded both sulfate radicals and hydroxyl radicals. The effects of pH, iron dissolution, and scavenging were characterized, and the results indicated that siderite mainly activated persulfates by acting as a source of Fe2+, and that sulfate radicals were the major active species. The release of Fe2+ and the production of sulfate radicals were controllable via the pH of the solution. No deactivation occurred when the siderite was reused, because the acidic environment partially dissolved the surface. These findings may facilitate the application of iron-bearing materials for sulfate radical production.

    更新日期:2018-01-17
  • Redox Induced Fluorescence On–Off Switching Based on Nitrogen Enriched Graphene Quantum Dots for Formaldehyde Detection and Bioimaging
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Hui-Jun Li, Xiong Sun, FengFeng Xue, Nanquan Ou, Bo-Wen Sun, Dong-Jin Qian, Meng Chen, Ding Wang, JunHe Yang, XianYing Wang
    更新日期:2018-01-16
  • 更新日期:2018-01-16
  • 更新日期:2018-01-16
  • High-Performance Triboelectric Nanogenerator with Double-Surface Shape-Complementary Microstructures Prepared by Using Simple Sandpaper Templates
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Xu-Wu Zhang, Gui-Zhong Li, Gui-Gen Wang, Ji-Li Tian, Yi-Lin Liu, Da-Ming Ye, Zheng Liu, Hua-Yu Zhang, Jie-Cai Han
    更新日期:2018-01-16
  • Toward Preventing Accidents in Process Industries by Inferring the Cognitive State of Control Room Operators through Eye Tracking
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Laya Das, Mohd Umair Iqbal, Punitkumar Bhavsar, Babji Srinivasan, Rajagopalan Srinivasan
    更新日期:2018-01-16
  • Surface Modification of Basalt Fiber with Organic/Inorganic Composites for Biofilm Carrier Used in Wastewater Treatment
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Xiaoying Zhang, Xiangtong Zhou, Huicheng Ni, Xinshan Rong, Qian Zhang, Xiang Xiao, Huan Huan, Jun Feng Liu, Zhiren Wu
    更新日期:2018-01-16
  • Use of Biogenic Silica in Porous Alginate Matrices for Sustainable Fertilization with Tailored Nutrient Delivery
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Mailson de Matos, Bruno D. Mattos, Blaise L. Tardy, Orlando J. Rojas, Washington L. E. Magalhães
    更新日期:2018-01-16
  • A statistical approach for the identification of cellulolytic enzyme inhibitors using switchgrass dilute acid prehydrolyzates as a model system
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Angele Djioleu, Danielle Julie Carrier

    The identification of biomass pretreatment-generated compounds that impede cellulose hydrolysis is critical for improving the overall biomass saccharification process. The aim of this study was to correlate the identification and concentrations of switchgrass dilute acid pretreatment-generated compounds to cellulolytic enzyme inhibition and to tie this back to processing parameters. Twenty-four dilute acid prehydrolyzates were prepared with switchgrass at temperatures from 140°C to 180°C, processing times from 10 to 40 min, and sulfuric acid concentrations of 0.5% or 1% (v/v). Results showed that all the switchgrass prehydrolyzates significantly reduced cellulolytic enzyme activities when assayed against model substrates. Exoglucanase was the most sensitive with its activity reduction, ranging from 58% to 88%; the inhibitory effect on β-glucosidase and the cellulase cocktail ranged from 32% to 63% and 16% to 41%, respectively. Polyphenolic compounds were the most detrimental pretreatment-generated products to the cellulolytic enzymes, especially to exoglucanase. Limited enzyme inhibition, with acceptable biomass digestibility were observed with pretreatment conditions corresponding to 160°C. The statistical based approach used in this study proved to be a valid method to assess the effect of pretreatment-generated compounds on cellulolytic enzyme activities, linking their generation to pretreatment processing parameters.

    更新日期:2018-01-16
  • A green approach to produce graphene thin film on conductive LCD matrix for the oxidative transformation of ciprofloxacin
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Govindaraj Divyapriya, Prabhu Thangadurai, Indumathi M Nambi

    This study demonstrates the use of disposed Liquid Crystal Display (LCD) glass as a supporting matrix for the fabrication of binder/linker free thin film graphene electrode. Graphene oxide (GO) was drop casted onto the LCD matrix and electrochemically reduced to form ErGO−LCD electrode which was subsequently employed for the electro-Fenton oxidation of ciprofloxacin. Fourier transform infrared spectrum confirm the presence of (i) functional groups such as C=O, N–H, C≡N, C–N on LCD matrix (ii) attachment of GO onto the LCD and (iii) reduction of oxygen functionalities at the surface of ErGO–LCD electrode. Raman and X-ray photoelectron spectroscopy were performed to examine the nature and chemical composition of GO−LCD and ErGO−LCD electrodes. Cyclic voltammetry and electrochemical impedance spectroscopic studies revealed that the enhancement of oxidation-reduction properties and reduction of charge transfer resistance (Rct 17 Ω) in the presence of [Fe(CN)6]3−/4− redox species. Electro-Fenton results revealed that the high concentration of H2O2 (45 mg L─1) was produced at acidic pH as compared to neutral (20 mg L−1) or alkaline (15 mg L−1) condition. Furthermore, higher current efficiency for the production of H2O2 was found at −1.0 V (63%) as compared to −1.5 V (59%) and −2.0 V (51%). Degradation studies showed >99% removal of ciprofloxacin was observed at pH 3.5 as compared to pH 7.0 (92%) or pH 9.0 (77%) at −1.5 V. The reuse experiments suggested that the electrode is stable and reusable for more than 7 cycles of experiments. The average pseudo first order kinetic rate constant for seven cycles of reuse was found to be 0.017 min─1.

    更新日期:2018-01-16
  • NH2OH-Mediated Lignin Conversion to Isoxazole and Nitrile
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Hongji Li, Min Wang, Huifang Liu, Nengchao Luo, Jianmin Lu, Chaofeng Zhang, Feng Wang

    Conversion of lignin to aromatic compounds via C-C/C-O bond cleavage has been an attractive but challenging subject in recent years. We herein report the first protocol that converts lignin model and pre-oxidized lignin to isoxazole and aromatic nitrile. Isoxazole motif is constructed by β-hydroxyl ketone condensation with hydroxylamine. Magnesium oxide promotes oximation reaction and an intramolecular condensation. Aromatic nitriles and esters are obtained via Beckmann rearrangement or acidolysis reaction depending on selected additive. The hydroxylamine-mediated strategy works well for the pre-oxidized lignin conversion to aromatic isoxazole, nitrile and ester monomers with up to 7.6% yield.

    更新日期:2018-01-16
  • Structural Characterization of Loblolly Pine derived Biochar by X-ray Diffraction and Electron Energy Loss Spectroscopy
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Seunghyun Yoo, Stephen Kelley, David Tilotta, Sunkyu Park

    Biochar from lignocellulosic biomass is emerging as a sustainable material with versatile applications, but its detailed property is poorly understood due to the structural complexity. We propose a biochar structural development model based on the experimental results including composition analysis, surface area/pore analysis, x-ray diffraction analysis, electron microscope imaging, and electron energy loss spectroscopy. Loblolly pine derived biochars were produced at different carbonization temperatures from 300 to 1,000℃. Fixed carbon, sp2 content, and number of graphene layer increased with the increased carbonization temperature. Alternating average C-C bond length, interlayer spacing distance, and layer coherence length were observed. Bulk plasmon excitation energy was correlated to the average C-C bond length that it serves as a good indicator of the carbon structure development. Based on the experimental results, four different structural development phases are identified, which provide a comprehensive understanding of biochar nano-carbon crystallite development. Unlike previous biochar structure models, which proposed radially growing polyaromatic carbon crystallite, we propose a lengthwise growing polyaromatic carbon crystallite model. This experimental-based biochar model should be helpful when determining structure of unknown biomass derived carbon materials and disordered pyrolytic carbon materials.

    更新日期:2018-01-16
  • Exploit Carbon Materials to Accelerate Initiation and Enhance Process Stability of CO Anaerobic Open-Culture Fermentation
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-16
    Fan Lü, Ke-jian Guo, Hao-wen Duan, Li-ming Shao, Pin-Jing He

    The aim of this study was to investigate the possibility of improving anaerobic fermentation of carbon monoxide (CO), a dominant component in syngas, through the assistance of different carbon materials (activated carbon, biochar, graphene, carbon cloth, and carbon fibre). Results showed that only biochar and activated carbon could promote CO utilization when the pCO increased from 0.07 to 0.21 atm and promoted CO methanization but was delayed until the pCO further increased from 0.21 to 0.41 atm. Compared to the control without carbon material addition, the CO conversion rate increased by up to 149% and 193% and the methane (CH4) production rate was up to 238% and 186%, respectively, for the biochar and activated carbon scenarios. Graphene and carbon cloth did not accelerate CO utilization but could stabilize the bio-reaction at a high pCO. Natural stable carbon isotope signals revealed that CH4 production from CO was mainly via acetate at low pCO and via hydrogen at high pCO. Result from high-throughput sequencing showed that biochar and activated carbon boosted the growth of Rikenellaceae and Thiobacillus in the solid phase. Synergistaceae which can be in co-culture with Methanobacterium was boosted in the liquid phase in biochar group and activated carbon group.

    更新日期:2018-01-16
  • Conversion of Furfuryl Alcohol to Levulinic Acid in Aqueous Solution Catalyzed by Shell Thickness-Controlled Arenesulfonic Acid Functionalized Ethyl-Bridged Organosilica Hollow Nanospheres
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-15
    Sai An, Daiyu Song, Yingnan Sun, Qingqing Zhang, Panpan Zhang, Yihang Guo

    A series of arenesulfonic acid functionalized ethyl-bridged organosilica hollow nanospheres, ArSO3H-Et-HNS, with different shell thicknesses (2-6 nm) were successfully fabricated by P123 and/or F127-directed sol-gel co-condensation route and carefully controlled molar composition of the starting materials in the synthetic gel. The ArSO3H-Et-HNS were applied in the synthesis of levulinic acid (LA) from the hydrolysis of furfuryl alcohol (FAL), and the influence of experimental parameters including solvent nature, volume ratio of FAL-to-solvent-to-water, shell thickness of hollow nanospheres and reaction temperature were considered. The hydrolysis activity of the ArSO3H-Et-HNS outperformed commercially available HY-zeolite, Amberlyst-15 and p-toluenesulfonic acid, regardless of the shell thickness of the hollow nanospheres; additionally, P123-directed ArSO3H-Et-HNS with the thinnest shell (2 nm) and the largest BET surface area (529 m2 g–1) exhibited the highest hydrolysis activity among various ArSO3H-Et-HNS nanohybrids, and under the conditions of 0.72 mol L-1 FAL in 4:1 acetone-H2O, 3 wt% catalyst and 120 oC, the yield of LA reached 83.1% after the reaction proceeded for 120 min. The excellent hydrolysis activity of the ArSO3H-Et-HNS was explained in terms of the strong Brønsted acid nature, unique hollow spherical nanostructures with opening shell and hydrophobic surface. Based on the catalytic test results and the identified intermediates, the reaction mechanism of the ArSO3H-Et-HNS-catalyzed hydrolysis of FAL to LA was tentatively revealed. Finally, the reusability of the ArSO3H-Et-HNS was studied through three consecutive catalytic cycles.

    更新日期:2018-01-16
  • Ultrasound Assisted Hydrotropic Extraction: A Greener Approach for the Isolation of Geraniol from the Leaves of Cymbopogon martinii
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-15
    Miral R. Thakker, Jigisha K. Parikh, Meghal A Desai

    Geraniol, a prime constituent in the leaves of Cymbopogon martinii, has the varied range of biological activities and applications. For the selective isolation of geraniol, a newer concept of combining hydrotropic extraction with ultrasound was adopted. This was conceptualized to reduce the time of extraction and hydrotrope requirement while maintaining the quality of the product. Sodium cumene sulfonate was selected as a suitable hydrotrope amongst sodium cumene sulfonate, sodium salicylate, sodium salt of para toluene sulfonic acid and resorcinol using the solubilization study. The screening of extraction parameters viz., ultrasound amplitude, cycle time, volume of hydrotropic solution, hydrotropic concentration, ultrasonic power and sonication time was carried out using the Taguchi method. Optimization of process parameters was performed using central composite response surface design. 1.9012 % (w/w) yield of geraniol was obtained under optimized conditions (65 % ultrasound amplitude, 65 mL volume of 1 M aqueous solution of sodium cumene sulfonate, 60 W ultrasound power, 70 % cycle time and 16 min of sonication time). A microscopic study was also performed to understand the extraction mechanism. Ultrasound assisted hydrotropic extraction turned out to be the best sustainable alternative compared to the hydrotropic extraction because of shortening of extraction time and reduction in hydrotrope concentration.

    更新日期:2018-01-16
  • Channel Interactions and Robust Inference for Ratiometric β-lactamase Assay Data: a Tox21 Library Analysis.
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-15
    Fjodor Melnikov, Jui-Hua Hsieh, Nisha S Sipes, Paul T. Anastas

    Ratiometric β-lactamase (BLA) reporters are widely used to study transcriptional responses in a high throughput screening (HTS) format. Typically, a ratio readout (background/target fluorescence) is used for toxicity assessment and structure-activity modeling efforts from BLA HTS data. This ratio readout may be confounded by channel-specific artifacts. To maximize the utility of BLA HTS data, we analyzed the relationship between individual channels and ratio readouts after fitting 10,000 chemical titration series screened in seven BLA stress-response assays from the Tox21 initiative. Similar to previous observations, we found that activity classifications based on BLA ratio readout alone are confounded by interference patterns for up to 85% (50 % on average) of active chemicals. Most Tox21 analyses adjust for this issue by evaluating target and ratio readout direction. In addition, we found that the potency and efficacy estimates derived from the ratio readouts may not represent the target channel effects and thus complicates chemical activity comparison. From these analyses we recommend a simpler approach using a direct evaluation of the target and background channels as well as the respective noise levels when using BLA data for toxicity assessment. This approach eliminates the channel interference issues and allows for straightforward chemical assessment and comparisons.

    更新日期:2018-01-15
  • Facile strategy in designing epoxy/paraffin multiple phase change materials for thermal energy storage applications
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-15
    Qingsong Lian, Yan Li, Asim A. S. Sayyed, Jue Cheng, Junying Zhang

    Designing novel phase change materials (PCMs) is of vital importance in achieving the sustainable development of energy. Here, we facilely prepare a series of novel multiple solid-solid PCMs (SSPCMs, EPPa-X systems) by blending paraffin, epoxy resin with crystalline side chains (D18), and poly(propylene oxide)diamine together followed by a one-pot curing process. Strong intermolecular forces between paraffin and D18 (based on their good compatibility) and reliable three-dimensional (3-D) crosslinking network of epoxy resin form a unique encapsulation mechanism, which provides the EPPa-X SSPCMs with excellent shape-stable properties and superior thermal stability (remain stable below 180 oC) without sacrificing too much latent heat of paraffin (only 1.6% latent heat loss). Due to the combination of two melting process at 36 oC and 60 oC derived from D18 and paraffin, respectively, the latent heat of the EPPa-50 system is high to 152.6 J/g. Besides, the supercooling extent of D18 decreased from 13.6 oC to 10.5 oC with the adding of paraffin due to the heterogeneous nucleation effect. The novel EPPa-X SSPCMs possess tremendous potential for a wide range of applications due to their facile preparation, low cost, high reliability, and excellent phase change properties; while the unique encapsulation mechanism may open a new door for preparing other novel types of PCMs.

    更新日期:2018-01-15
  • High-Temperature Batch and Continuous-Flow Transesterification of Alkyl and Enol Esters with Glycerol and its Acetal Derivatives
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-15
    Roberto Calmanti, Manuele Galvan, Emanuele Amadio, Alvise Perosa, Maurizio Selva

    A new procedure for the transesterification of safe alkyl acetates and formates with model glycerol acetals (GAs: Solketal and glycerol formal) was explored in the absence of any catalysts at 180-275 °C. Highly selective transformations occurred in both batch and continuous-flow (CF) modes: particularly, the enol derivative isopropenyl acetate (iPAc) was the best performing reactant by which quantitative acetylation reactions were achieved with yields on GAs acetates > 95% and productivity up to 31 mg min-1. An excess acylating agent was necessary (2-20 molar equivs.), but the unconverted ester was fully recovered and could be reused. The reaction plausibly involved multiple mechanisms where either the electrophilic and the nucleophilic activation of reagents took place through both traces of acetic acid (formed in situ by the hydrolysis of esters) and the autoprotolysis of GAs. iPAc confirmed a superior performance than other esters also for the thermal (catalyst-free) conversion of glycerol: in this case, although acylation and acetalization processes were simultaneously possible, conditions were optimised to achieve the exhaustive transesterification of glycerol to triacetin, in both batch and CF modes. Triacetine was isolated in 99% yield.

    更新日期:2018-01-15
  • An Ultrafast-Versatile-Domestic-Microwave-Oven Based Graphene Oxide Reactor for the Synthesis of Highly Efficient Graphene Based Hybrid Electrocatalysts
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-14
    Barun Kumar Barman, Karuna Kar Nanda

    Graphene oxide (GO) itself can act as a high temperature REACTOR for ultrafast and in-situ synthesis of graphene based hybrids within 60 s in open atmosphere. When solid GO treated with microwave, it generates huge heat followed by reduction and exfoliation within 60 s. By exploiting this simple GO reactor, graphene based hybrids such as Fe3C-G@rGO, Co-Fe3C-G@rGO, Fe-Fe3C-NG@rGO, CoO@rGO and Pt@rGO (G represents graphene and NG represents N-doped graphene) by simply mixing appropriate precursors with GO and treating with microwave. The experiments neither require any external high temperature reactors/furnaces or any chemical reagents or solvents. Overall, these rGO based hybrids show very efficient oxygen evolution reaction (OER), oxygen reduction reaction (ORR) and methanol oxidation activity compared to their traditional counterparts. Among those catalyst, CoO@rGO and Co-Fe3C-G@rGO show outstanding OER performances with very low over potential () and archived 10 mA/cm2 current density only 1.52 V and 1.56 V potential with long term stability. Fe-Fe3C-NG@rGO hybrid nanostructures shows better oxygen reduction performances with similar onset potential with precious Pt/C catalyst. The Pt@rGO shows very stable methanol oxidation activity compared with the Pt/C catalyst. The high catalytic activity and stability are believed to be due to the better adherence of inorganic nanostructures onto rGO and this methodology open a new era of synthesis of rGO based various hybrids nanostructures for various applications.

    更新日期:2018-01-15
  • Metal-free sulfonylation of 3,4-dihalo-2(5H)-furanones (X= Cl, Br) with sodium sulfinates under air atmosphere in aqueous media via a radical pathway
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-14
    Liang Cao, Jianxiao Li, Han-Qing Wu, Kai Jiang, Zhi-Feng Hao, Shihe Luo, ZhaoYang Wang

    A convenient and environmentally friendly protocol has been developed for the preparation of various sulfonylated 2(5H)-furanones by the sulfonylation of Csp2-X compounds with sodium sulfinates via a metal-free radical pathway. For low-cost Csp2-Cl substrates, there is also a satisfactory reactivity with moderate to excellent yields as well as high atom economy. Importantly, the application of this method into a gram-scale (even over 10 g) preparation can be accomplished.

    更新日期:2018-01-15
  • Green recovery of titanium and effective regeneration of TiO2 photocatalysts from spent SCR catalysts
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-12
    Qijun Zhang, Yufeng Wu, Tieyong Zuo

    The extensive use of selective catalytic reduction (SCR) catalysts will afford many spent SCR catalysts. The mass fraction of the titanium component is over 80% in spent SCR catalysts, but currently, it is usually thrown away without proper recycling. This work aims to develop a clean, green, and economical approach to recovering titanium and regenerating TiO2 photocatalysts from spent SCR catalysts based on the conversion of the titanium component. This titanium component is converted into metastable α-Na2TiO3 with high efficiency (> 98%) using a NaOH molten salt method, and the optimal conditions were found to be a roasting temperature of 550 °C, a NaOH-to-spent-SCR-catalysts mass ratio of 1.8:1, a roasting time of 10 min, and a NaOH concentration of 60-80 wt.%. And a possible chemical reaction mechanism is proposed. A subsequent hydrothermal treatment of α-Na2TiO3 regenerates TiO2 photocatalysts with high purity (> 99.0%) that can satisfy commercial requirements. In addition, the present iron element contained in spent SCR catalysts is doped into regenerated TiO2 photocatalysts, resulting in providing visible-light-driven photocatalytic activities. The regenerated TiO2 photocatalysts possess superior photocatalytic degradation capacities for dye pollutants and can be used to efficiently treat wastewater. This work introduces a promising technology for the cyclical regeneration of titanium from spent SCR catalysts.

    更新日期:2018-01-13
  • Lignin functionalized with succinic anhydride as building block for bio-based thermosetting polyester coatings
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-12
    Carmela Scarica, Raffaella Suriano, Marinella Levi, Stefano Turri, Gianmarco Griffini

    Novel lignin-based thermosetting polyester (PE) coating systems are presented in this work. These new materials are based on the functionalization of a soluble fraction of softwood kraft lignin recovered from solvent extraction with increasing amounts of succinic anhydride (SAn), to obtain SAn/lignin adducts via the formation of ester bonds on the hydroxyl groups in lignin. A thorough chemical, physical and thermal characterization of the resulting esterified materials was conducted to confirm the successful covalent incorporation of SAn in the lignin macromolecule. Such functionalized SAn/lignin adducts were employed as building blocks for the preparation of crosslinked lignin-based PE coatings in different curing conditions. These PE coatings highlighted improved thermal stability, film forming ability, solvent resistance, dynamic surface hardness and higher hydrophobic character compared with the unmodified parent lignin precursor. In addition, the adhesion strength of these systems on different substrates was also assessed. The results of this study demonstrate an easily accessible approach to develop high-lignin-content thermosetting PE systems and provide evidence of the potential of these materials as bio-derived coatings and adhesives.

    更新日期:2018-01-13
  • Biobased Anethole/Polymethacrylate Cross-linked Materials with Good Transparency and High thermostability
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-12
    Fengkai He, Kaikai Jin, Jing Sun, Qiang Fang

    A series of new thermo-crosslinkable polymers with both excellent transparency and thermostability derived from a biorenewable plant oil (anethole) are reported here. By using the plant oil as the feedstock, a new monomer (anethole-based methacrylate) containing propenyl and acryloyl functional units is successfully synthesized via a simple two-step reaction route. Copolymerizing the monomer with methyl methacrylate (MA) in the presence of radical initiator gives the copolymers, which are post-polymerized at high temperature to form the polymers, exhibiting the thermostability and the transmittance depending on the content of the anethole-based methacrylate. With the increasing of the content of the anethole-based methacrylate, the thermostability of the crosslinked polymers raises while the transparency decreases. The best results are obtained when the molar ratio between methyl acrylate and anethole-based methacrylate is 2:1. In that case, the cured polymer shows a glass transition temperature (Tg) of 148 C and a coefficient of thermal expansion (CTE) of 152.58 ppm/°C, as well as high transparency with the transmittance of more than 92% from 450 to 1100 nm. These data exhibit that the new methacrylate-containing polymers derivated from a biorenewable can be used as the high performance optical materials with both good transparency and high thermostability.

    更新日期:2018-01-13
  • Heat Transfer Blocks Diagram: A Novel Tool for Targeting and Design of Heat Exchanger Networks Inside Heat Integrated Water Allocation Networks
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-12
    Xiaodong Hong, Zuwei Liao, Jingyuan Sun, Binbo Jiang, Jingdai Wang, Yongrong Yang
    更新日期:2018-01-12
  • Multiwalled Carbon Nanotubes Anode in Lithium-Ion Battery with LiCoO2, Li[Ni1/3Co1/3Mn1/3]O2 and LiFe1/4Mn1/2Co1/4PO4 Cathodes
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Daniele Di Lecce, Paolo Andreotti, Mattia Boni, Giulia Gasparro, Giulia Rizzati, Jang-Yeon Hwang, Yang-Kook Sun, Jusef Hassoun

    Multiwalled carbon nanotubes (MWCNTs) are studied for the first time as the anode in lithium-ion batteries using LiCoO2, Li[Ni1/3Co1/3Mn1/3]O2 and LiFe1/4Mn1/2Co1/4PO4 cathodes. The anode material has a partially graphitic structure and nanotube morphology, which ensure stable cycling, Coulombic efficiency exceeding 99% as well as remarkable rate-capability in lithium half-cell, and suggest the compatibility for full-cell application. The performance of each lithium-ion array appears strongly related to the different structural, morphological and electrochemical features of the positive electrodes. The study in full-cell of the MWCNT anode, to date mostly investigated in lithium half-cell, is therefore performed under various conditions. The MWCNT/Li[Ni1/3Co1/3Mn1/3]O2 combination reveals promising behavior in terms of cycling stability, reversible capacity and Coulombic efficiency, which well demonstrates the potential suitability of MWCNTs as anodes in lithium-ion cell.

    更新日期:2018-01-12
  • 更新日期:2018-01-12
  • Green Chemistry and the Search for New Plasticizers
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    J. Patrick Harmon, Rainer Otter
    更新日期:2018-01-12
  • A Critical Review and Analysis on the Recycling of Spent Lithium-Ion Batteries
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Weiguang Lv, Zhonghang Wang, Hongbin Cao, Yong Sun, Yi Zhang, Zhi Sun
    更新日期:2018-01-12
  • 更新日期:2018-01-12
  • Highly biocompatible, underwater superhydrophilic and multifunctional biopolymer membrane for efficient oil/water separation and aqueous pollutant removal
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Minxiang Zeng, Ian Echols, Pingmei Wang, Shijun Lei, Jianhui Luo, Baoliang Peng, Lipeng He, Lecheng Zhang, Dali Huang, Carlos Mejia, Ling Wang, M. Sam Mannan, Zhengdong Cheng

    Conventional wastewater treatment systems generally require multiple steps and complex procedures to remove aqueous pollutants and oil contaminants from polluted water. Herein, we fabricate an underwater superoleophobic membrane by crosslinking konjac glucomannan on pristine fabrics, demonstrating that the concept of oil-water separation and the principle of aqueous pollutant removal can be integrated. Such biopolymer-modified fabric not only separates oil-water mixtures with high efficiency (up to 99.9%), but also exhibits the intriguing characteristic of removing water-soluble pollutants (including polyaromatic dyes and heavy metal ions). As a proof of concept, the synthetic wastewater purified with biopolymer membranes was used to cultivate and irrigate pinto beans, causing no observable deleterious effect on seed germination and growth. These results further confirm the biocompatibility and effectiveness of biopolymer membranes, offering an encouraging solution to challenges including wastewater treatment, fuel purification, and clean-up of oil spills.

    更新日期:2018-01-12
  • Biorefining of bilberry (Vaccinium myrtillus L.) pomace using microwave hydro-diffusion and gravity, ultrasound assisted and bead milling extraction
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Harish Karthikeyan Ravi, Cassandra Breil, Maryline Abert Vian, Farid Chemat, Petras Rimantas Venskutonis

    Bio-refining of bilberry pomace using innovative technologies such as microwave hydro diffusion and gravity extraction (MHG) and ultrasound assisted extraction (UAE) with different concentrations of ethanol/water as the solvent was established. Bead milling was also utilized in this sequential extraction scheme to remove the lipophilic fraction. Solubility index of target polyphenols was predicted using a computational tool (COSMO-RS) and compared to experimental results obtained by in vitro antioxidant activity assessments. MHG extracts obtained using microwave power of 2 W/g had the highest Folin-Ciocalteu reducing capacity (43.46 ± 0.48 mg GAE/g of extract), total flavonoid (4.17 ± 0.04 mg QE/g of extract), total monomeric anthocyanin content (12.19 ± 0.13 mg D3GE/g of extract) and radical scavenging capacity (22.64 ± 2.23 mg TE/g of extract). In UA ethanol/water extracts the highest flavonoid (10.41 ± 0.08 mg QE/g of extract) and anthocyanin content (12.19 ± 0.51 D3GE mg/g of extract) was present in ethanol (100%), these results were in good correlation with computational prediction. The lipid fraction recovered from pomace using bead milling extraction was mainly composed of oil rich in polyunsaturated linoleic and linolenic acids.

    更新日期:2018-01-12
  • 更新日期:2018-01-11
  • 更新日期:2018-01-11
  • Toward the Rational Design of Sustainable Hair Dyes Using Cheminformatics Approaches: Step 1. Database Development and Analysis
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Tova N. Williams, Melaine A. Kuenemann, George A. Van Den Driessche, Antony J. Williams, Denis Fourches, Harold S. Freeman
    更新日期:2018-01-11
  • CO2-Switchable Pickering Emulsion Using Functionalized Silica Nanoparticles Decorated by Amine Oxide-Based Surfactants
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Yongmin Zhang, Xiaofei Ren, Shuang Guo, Xuefeng Liu, Yun Fang
    更新日期:2018-01-11
  • Enhancement of mass transfer intensification for essential oil release from Lavandula pubescence using integrated ultrasonic-microwave technique and enzymatic pre-treatment
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Marwan M.A. Rashed, Abduljalil D.S. Ghaleb, JingPeng Li, Ahlam Nagi, Yuan Hua-wei, Zhu Wen-you, Qunyi Tong

    This work was designed to utilize the integration of ultrasonic-microwave assisted preceded by enzymolysis pre-treatment to enhance the extraction efficiency of essential oil (EO) from wild Lavandula pubescens (Lp). Cellulase (C-ase), hemicellulase (H-ase) and mixed enzymes (C-ase/H-ase) were used at 10 mg/100 mL of the liquid phase. Gas chromatography mass spectrometry (GC-MS) system was used for chemical composition analyses of Lavandula pubescens essential oil (Lp-EO). C-ase pre-treatment achieved the highest yield (0.50%) of EO and highest ratio of carvacrol (29.22%) as the main compound in comparison to other treatments. Changes in the morphological structure of Lp tissues were tracked using Scanning electron microscope (SEM). Free radical-scavenging activity was assessed using DPPH•-SA and ABTS•+SA assays. The optimal extraction conditions were enzyme concentration of 14.82mg/100mL, sonication time of 38.18min, and microwave power at 333W. At these conditions, the maximum %yield, %DPPH•-SA, and ABTS•+SA were 0.67%, 65.40% and 0.025 (as mM Trolox), respectively. Results exhibited that the isolated Lp-EO could be used as anti-free radical and anti-bacterial agents in the biological systems.

    更新日期:2018-01-11
  • Synthesis of High-Performance Titanium Sub-Oxides for Electrochemical Applications Using Combination of Sol-Gel and Vacuum-Carbothermic Processes
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Sheng-Siang Huang, Yu-Hsiang Lin, Wesley Chuang, Pei-Sian Shao, Chung-Hsien Chuang, Jyh-Fu Lee, Meng-Lin Lu, Yu-Ting Weng, Nae-Lih Wu

    A series of nanocrystalline titanium (Ti) sub-oxides, including TiO, Ti2O3, Ti3O5 and Ti4O7, with high surface area and activity are successively synthesized using a facile synthesis method that combines the sol-gel and the energy-efficient vacuum carbothermic (SG-VC) processes. The combination results in synergy in producing nanomaterials with high surface area (>100 m2 g-1), good conductivity and rich intra-grain defect features, giving the oxides unique surface activities suitable for particular electrochemical applications. The phase compositions of the resulting powders are primarily determined by two process parameters, including the carbothermic carbon (C) content, expressed as the C-to-Ti molar ratio of the reactant powder, and the cooling protocol. Carbothermic C contents exceeding a threshold (C/Ti ~3.7) exclusively produced non-Magnéli phase (MP) oxides including TiO and Ti2O3, while the MP oxides, Ti3O5 and Ti4O7, can be formed only with lower C contents combined with selected quenching protocols that kinetically limit oxygen replenishment during cooling. Examples of the resulting MP Ti4O7 powder exhibiting outstanding pseudocapacitance and oxygen-evolution-reaction catalysis activity are demonstrated.

    更新日期:2018-01-11
  • Valorization of acid isolated high yield lignin nanoparticles as innovative antioxidant/antimicrobial organic materials
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Weijun Yang, Elena Fortunati, Daqian Gao, Giorgio Mariano Balestra, Geremia Giovanale, Xiaoyan He, Luigi Torre, Josè M. Kenny, Debora Puglia

    In this study, dissolution of pristine alkali lignin into ethylene glycol, followed by addition of different acidic conditions (HCl, H2SO4 and H3PO4 at different pH) has been considered as a simple method to prepare high yield lignin nanoparticles (LNP). Field emission scanning electron microscopy (FESEM), Nano-Zetzsozer (ZS), gel permeation chromatography (GPC) and thermo gravimetric analysis (TGA) have been utilized to determine the influences of the precipitation procedures on particle size, Zeta potential, molecular weight and thermal stability of final obtained LNP. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and nuclear magnetic resonance (NMR) were also considered to investigate the influences of lignin chemical structures and composition on its antioxidative and antimicrobial behaviours. Results from DPPH (1,1-Diphenyl-2-picryl-hydrazyl) activity revealed the antioxidant response of LNP aqueous solution, whereas results from antimicrobial tests confirmed LNP as effective antibacterial agents against Gram negative bacteria Pseudomonas syringae pv. tomato (CFBP 1323) (Pst), Xanthomonas axonopodis pv. vesicatoria (CFBP 3274) (Xav) and Xanthomonas arboricola pv. pruni (CFBP 3894) (Xap) plant pathogen strains. The results confirmed how high efficient antioxidant and antimicrobial LNP could be considered as an easy methodology for plant pathogens control.

    更新日期:2018-01-11
  • Pt Nanoparticles Deposited and Tannic Acid-Reduced Graphene Oxide for Switchable Bioelectronics and Biosensors Based on Direct Electrochemistry
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-11
    Bilge Akkaya, Bekir Çakıroğlu, Mahmut Ozacar

    In this study, we reported a novel biosensor based on direct electrochemistry of glucose oxidase (GOx) at Pt nanoparticles deposited and tannic acid-reduced graphene oxide nanocomposite modified glassy carbon electrode. Tannic acid (TA) was utilized for the simultaneous green reduction of Pt4+ and graphene oxide (GO), and as a modifying agent for the GOx immobilization and formation of switchable surface with pH and temperature alterations. Upon the oxidation of TA to quinone electrochemically, enhanced electron transfer was obtained, and a third generation biosensor was fabricated by using π-π interaction between GO and TA, and Schiff-base assisted hydrogen bonds between GOx-TA interactions. The redox peaks was observed at a formal potential of −0.462 V with a peak separation (ΔEp) of 56 mV, which reveals the fast electron transfer. The linear response to glucose oxidation was 2-10 mM with a limit of detection of 1.21 μM and a sensitivity of 27.51 μAmM−1cm−2. Upon the deposition of poly(N-isopropylacrylamide) (PNIPAAm) onto the constructed biosensor via hydrogen bonds, on-off biosensor was fabricated with a zipper-like interfacial properties upon the formation of shrunken and compact globule PNIPAAm structure, and varying surface charge. Therefore, this study confirmed the versatile aspect of natural TA without using complicated methods.

    更新日期:2018-01-11
  • Preventing Discoloration of Poly(vinyl alcohol)-Coated Paper Hydrophobized by Gas Grafting with Palmitoyl Chloride
    ACS Sustainable Chem. Eng. (IF 5.951) Pub Date : 2018-01-10
    Tai-Ju Lee, Dong-Jin Lee, Jin-Ho Seo, Kwang-Seob Lee, David Guerin, Philippe Martinez, Myoung-Ku Lee, Jeong-Yong Ryu
    更新日期:2018-01-11
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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