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  • Effective removal of hazardous trace metals from recovery boiler fly ashes
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-20
    Teemu Kinnarinen, Mohammad Golmaei, Eeva Jernström, Antti Häkkinen

    The objective of this study is to introduce a treatment sequence enabling straightforward and effective recovery of hazardous trace elements from recovery boiler fly ash (RBFA) by a novel method, and to demonstrate the subsequent removal of Cl and K with the existing crystallization technology. The treatment sequence comprises two stages: dissolution of most other RBFA components than the hazardous trace elements in water in Step 1 of the treatment, and crystallization of the process chemicals in Step 2. Solid-liquid separation has an important role in the treatment, due to the need to separate first the small solid residue containing the trace elements, and to separate the valuable crystals, containing Na and S, from the liquid rich in Cl and K. According to the results, nearly complete recovery of cadmium, lead and zinc can be reached even without pH adjustment. Some other metals, such as Mg and Mn, are removed together with the hazardous metals. Regarding the removal of Cl and K from the process, in this non-optimized case the removal efficiency was satisfactory: 60–70% for K when 80% of sodium was recovered, and close to 70% for Cl when 80% of sulfate was recovered.

    更新日期:2017-11-20
  • Melamine-containing polyphosphazene wrapped ammonium polyphosphate: a novel multifunctional organic-inorganic hybrid flame retardant
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-20
    Shuilai Qiu, Chao Ma, Xin Wang, Xia Zhou, Xiaming Feng, Richard K.K. Yuen, Yuan Hu

    To achieve superior fire safety epoxy resins (EP), a novel multifunctional organic-inorganic hybrid, melamine-containing polyphosphazene wrapped ammonium polyphosphate (PZMA@APP) with rich amino groups was prepared and used as an efficient flame retardant. Thanks to the cross-linked polyphosphazene part, PZMA@APP exhibited high flame retardant efficiency and smoke suppression to the EP composites. Thermogravimetric analysis indicated that PZMA@APP significantly enhanced the thermal stability of EP composites. The obtained sample passed UL-94 V-0 rating with 10.0 wt% addition of PZMA@APP. Notably, inclusion of incorporating PZMA@APP leads to significantly decrease on fire hazards of EP, for instance, bring about a 75.6% maximum decrease in peak heat release rate and 65.9% maximum reduction in total heat release, accompanied with lower smoke production rate and higher graphitized char layer. With regards to mechanical property, the glass transition temperature of EP/PZMA@APP10.0 was as high as 184.5 °C. In particular, the addition of PZMA@APP did not worsen the mechanical properties, compared to pure APP. It was confirmed that the participation of melamine-containing polyphosphazene could significantly enhance the quality of char layer and thereby resulting the higher flame retardant efficiency of PZMA@APP.

    更新日期:2017-11-20
  • Magnetic multi-metal co-doped magnesium ferrite nanoparticles: an efficient visible light-assisted heterogeneous Fenton-like catalyst synthesized from saprolite laterite ore
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-20
    Yifei Diao, Zhikai Yan, Min Guo, Xidong Wang

    Magnetic nanoparticles of multi-metal co-doped magnesium ferrite (MgFe2O4) were synthesized from saprolite laterite ore by a hydrothermal method, and firstly proposed as a heterogeneous photon-Fenton-like catalyst for degradation of Rhodamine B (RhB). The factors that influence the degradation reaction including pH value, the concentration of H2O2 and the amount of catalyst, were systematically investigated. The doped MgFe2O4 exhibited a degradation efficiency up to 96.8%, and the chemical oxygen demand (COD) and total organic carbon (TOC) removal efficiencies about 85.6% and 68.3%, respectively, under visible light illumination for 180 min. The high activity is mainly attributed to the high specific surface area of the catalyst and the synergistic interaction between photo-catalytic oxidation and Fenton-like oxidation. Moreover, the catalyst also showed good stability and recycling performance for degrading RhB. After five consecutive degradation cycles, the activity decayed no more than 10%. Compared to other catalysts prepared from pure chemical agents, the multi-metal co-doped MgFe2O4 is more competitive due to its high activity, good stability, ease of recollection, and especially the use of saprolite laterite ore as precursor. This work may provide a new avenue to synthesize efficient ferrite catalysts for degrading organic pollutants in wastewater by using natural minerals.

    更新日期:2017-11-20
  • Mercuric Ion Capturing by Recoverable Titanium Carbide Magnetic Nanocomposite
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-20
    Asif Shahzad, Kashif Rasool, Waheed Miran, Mohsin Nawaz, Jiseon Jang, Khaled A. Mahmoud, Dae Sung Lee

    Two-dimensional metal carbides and nitrides (MXenes) have attracted increasing attention for application in water/wastewater treatment. The functionalization of MXenes to increase their stability while demonstrating high pollutant removal can facilitate sustainable water/wastewater treatment processes. In this study, the highly stable magnetic titanium carbide (Ti3C2Tx) MXene nanocomposite (MGMX nanocomposite) was successfully synthesized through a facile hydrothermal approach and was tested for aqueous-phase adsorptive removal of mercuric ions. The synthesized MGMX nanocomposite was studied using characteristic analyses, showing high stability as revealed by zeta-potential analysis and dynamic light-scattering technique. The MGMX nanocomposite presented excellent Hg(II) removal in a wide range of pH conditions, and an exceptional maximum experimental Hg(II) uptake capacity of 1128.41 mg g−1 was observed. The adsorption behavior was investigated using the Redlich-Peterson adsorption isotherm, pseudo second-order kinetics, and thermodynamics models. In the adsorption/desorption investigation, the MGMX nanocomposite was reusable for up to five cycles of adsorption/desorption. The stability, hydrophilic nature, available adsorptive surfaces, and easy separation after reaction make the MGMX nanocomposite an efficient sorbent for the removal of toxic Hg(II) for water purification.

    更新日期:2017-11-20
  • Construction of plasmonic Ag modified phosphorous-doped ultrathin g-C3N4 nanosheets/BiVO4 photocatalyst with enhanced visible-near-infrared response ability for ciprofloxacin degradation
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-15
    Yaocheng Deng, Lin Tang, Chengyang Feng, Guangming Zeng, Jiajia Wang, Yaoyu Zhou, Yani Liu, Bo Peng, Haopeng Feng

    To realize the full utilization of solar energy, the design of highly efficient photocatalyst with improved visible-near-infrared photocatalysis performance has attracted great attentions for environment pollutant removal. In this work, we rationally employed the surface plasmon resonance effect of metallic Ag in the phosphorus doped ultrathin g-C3N4 nanosheets (PCNS) and BiVO4 composites to construct a ternary Ag@PCNS/BiVO4 photocatalyst. It was applied for the photodegradation of ciprofloxacin (CIP), exhibiting 92.6% removal efficiency under visible light irradiation (λ > 420 nm) for 10 mg/L CIP, and presenting enhanced photocatalytic ability than that of single component or binary nanocomposites under near-infrared light irradiation (λ > 760 nm). The improved photocatalytic activity of the prepared Ag@PCNS/BiVO4 nanocomposite can be attributed to the synergistic effect among the PCNS, BiVO4 and Ag, which not only improves the visible light response ability and hinders the recombination efficiency of the photogenerated electrons and holes, but also retains the strong the redox ability of the photogenerated charges. According to the trapping experiment and ESR measurements results, radical dot OH, h+ and radical dot O2− all participated in the photocatalytic degradation process. Considering the SPR effect of metallic Ag and the established local electric field around the interfaces, a dual Z-scheme electrons transfer mechanism was proposed.

    更新日期:2017-11-17
  • 3D MnO2 hollow microspheres ozone-catalysis coupled with flat-plate membrane filtration for continuous removal of organic pollutants: Efficient heterogeneous catalytic system and membrane fouling control
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-14
    Zhuoyan He, Dehua Xia, Yajing Huang, Xiuqin Tan, Chun He, Lingling Hu, Huanjunwa He, Jiawei Zeng, Wenjun Xu, Dong Shu

    A heterogeneous catalytic ozonation/membrane filtration (HCOMF) system was fabricated by integrating a flat-plate polyvinylidene fluoride (PVDF) membrane module along with a slurry catalytic ozonation reactor. The performance and catalytic activity of HCOMF was evaluated for degradation of model wastewater containing bisphenol A (BPA) and humid acid (HA) under different permeation flux in long-term continuous experiments. The membrane fouling was investigated by trans-membranous pressure (TMP), membrane filtration resistance, scanning electronic microscopy (SEM), and fluorescence spectra. The results showed that HCOMF system exhibited an excellent and stable catalytic activity in long-term continuous experiments owning to integration of 3D MnO2 hollow microsphere ozone-catalysis with flat-plate membrane filtration. The TMP of HCOMF system didn’t increase significantly, and the membrane resistance Rp and Rc declined from 4% and 16% to 1% and 4%, respectively, thus, the membrane fouling of HCOMF system was mitigated compared to MF system. The mitigation of membrane fouling in HCOMF system was attributed to the increase of hydrophilicity of membrane surface and change of HA fractions.

    更新日期:2017-11-15
  • Degradation of 2,4-dichlorophenol by activating persulfate and peroxomonosulfate using micron or nanoscale zero-valent copper
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-14
    Peng Zhou, Jing Zhang, Yongli Zhang, Gucheng Zhang, Wenshu Li, Chenmo Wei, Juan Liang, Ya Liu, Shihu Shu

    The ability of persulfate (PS) and peroxymonosulfate (PMS) activated by micron or nanoscale zero-valent copper (ZVC or nZVC) to degrade 2,4-dichlorophenol (2,4-DCP) was quantified under various conditions. Mechanism investigation revealed that PS and PMS accelerated the corrosion of ZVC or nZVC to release Cu+ under acidic conditions. The in-situ generated Cu+ further decomposed PS or PMS to produce SO4<img border="0" alt="radical dot" src="https://cdn.els-cdn.com/sd/entities/rad">− and <img border="0" alt="radical dot" src="https://cdn.els-cdn.com/sd/entities/rad">OH, which then dramatically degraded 2,4-DCP. The kobs for 2,4-DCP removal followed pseudo-first-order kinetics, kobs of ZVC/PMS and nZVC/PMS systems were 10 ∼ 30 times greater than these in ZVC/PS and nZVC/PS systems. The nZVC/PMS system was most effective to remove 2,4-DCP which even did better than the nZVI/PMS system, with rate constant values ranging from 0.041 to 1.855 min−1. At higher pH ZVC is ineffective, but nZVC can activate PS and PMS to significantly degrade 2,4-DCP at pH up to 7.3. The 2,4-DCP degradation pathway was found to involve dechloridation, dehydrogenation, hydroxylation, ring open and mineralization. 56.7% and 45.3% of TOC removals were respectively obtained in the ZVC/PMS and nZVC/PMS systems within 120 min. This study helps to comprehend the application of zero-valent metals in reactive radicals-based oxidation processes and the reactivity of Cu+ as an activator of PS and PMS.

    更新日期:2017-11-15
  • Comparison analysis on the thermal runaway of lithium-ion battery under two heating modes
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-13
    Tangqin Wu, Haodong Chen, Qingsong Wang, Jinhua Sun

    The thermal stability evaluation of materials in a soft-pack commercial cell is tested using C80 calorimeter, including anode, cathode, separator and full cell (mixing of the three materials including additional electrolyte). Thermal runaway characteristic of the commercial cell is tested on the accelerating rate calorimeter (ARC) with two heating modes, including internal heating mode and external heating mode. The results show that the thermal stability of internal material for tested cell follows the below order: anode < separator < cathode. The voltage drop is influenced by the consumption of cathode and separator, while the effect of anode consumption on the voltage can be negligible. Both onset temperature and critical temperature in external heating mode are larger than that in internal heating mode. Thermal runaway induced by high temperature of the tested cell can be divided into three stages: 1) the cell can work under normal mode and all the internal exothermal reaction can be ignorable, 2) the exothermal of anode which can be detected and the thermal runaway can be stopped by effective heat dissipation, and 3) the cathode reaction and separator melting which cause the cell voltage drop and thermal runaway of the cell is inevitable in this stage.

    更新日期:2017-11-14
  • Generation and application of a novel transgenic zebrafish line Tg(cyp1a:mCherry) as an in vivo assay to sensitively monitor PAHs and TCDD in the environment
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-13
    Shao-Lin Xie, Muhammad Junaid, Wan-Ping Bian, Juan-Juan Luo, Jabir Hussain Syed, Chao Wang, Wen-Xu Xiong, Yan-Bo Ma, Aping Niu, Xiao-Jun Yang, Ji-Xing Zou, De-Sheng Pei

    The polycyclic aromatic hydrocarbons (PAHs) and 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) are classified as human carcinogens, and can also cause serious health problems. To develop a convenient bio-monitoring tool for the detection of PAHs and TCDD in the environment, we generated a transgenic zebrafish line Tg(cyp1a:mCherry) with cyp1a promoter driving mCherry expression. Here, Tg(cyp1a:mCherry) embryos were treated with different concentrations of TCDD and five US EPA priority PAHs congeners. The results showed that the expressions of mCherry and endogenous cyp1a were consistent with the PAHs exposure concentrations and were largely induced by TCDD and ≥4-ring PAHs. Moreover, the sensitivity of Tg(cyp1a:mCherry) embryos was also evaluated through monitoring of the PAHs contamination in the water and soil samples. The elevated red fluorescent signals and cyp1a expression levels were observed in Tg(cyp1a:mCherry) zebrafish after exposure to water samples and soil organic extracts with higher concentrations of ≥4-ring PAHs. These results further strengthen our findings of concentration- and congener-dependent response of the newly established zebrafish. Taken together, the newly established zebrafish line will prove as a sensitive, efficient and convenient tool for monitoring PAHs and TCDD contamination in the environment.

    更新日期:2017-11-14
  • Diversity, abundance, and persistence of antibiotic resistance genes in various types of animal manure following industrial composting
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-13
    Xun Qian, Jie Gu, Wei Sun, Xiao-Juan Wang, Jian-Qiang Su, Robert Stedfeld

    Aerobic composting is used widely for animal manure recycling, and it may reduce the amount of antibiotic resistance genes (ARGs) that enter the environment. We sampled three types of animal (bovine, chicken, and pig) manure and the corresponding composts from 12 large-scale farms, and tested multiple ARGs and mobile genetic elements (MGEs) by high-throughput qPCR. A total of 109 ARGs were detected in the manure and compost samples, thereby demonstrating that both are important ARG reservoirs. The diversity and abundance of ARGs were significantly higher in chicken and pig manure than bovine manure, but industrial composting was more efficient at reducing the ARGs in chicken manure than pig and bovine manure. Composting universally reduced some ARGs, but inconsistently influenced other ARGs from different types of animal manures. Network analysis detected the widespread co-occurrence of ARGs and MGEs. floR, ermF, catB3, aac(6′)-lb(akaaacA4), and aadA were identified as suitable indicator genes for estimating the total abundance of ARGs. Our results suggest that different animal species had significant effects on the diversity, abundance, and persistence of ARGs, where the abundance of transposons, heavy metal concentration, total nitrogen level, and the dosage and duration of exposure to antibiotics may explain these differences.

    更新日期:2017-11-13
  • Electrolysis assisted persulfate with annular iron sheet as anode for the enhanced degradation of 2, 4-dinitrophenol in aqueous solution
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-12
    Jun Li, Yi Ren, Leiduo Lai, Bo Lai

    Annular iron sheet (AIS), playing a dual role of anode electrode and source of activator, was combined with electrolysis technology for the activation of persulfate to improve the degradation of 2, 4-dinitrophenol (DNP) in aqueous solution. In this study, effects of current density (0–10.0 mA/cm2), persulfate (PS) dosage (0–8.0 mM), initial pH (3.0–11.0), reaction temperature (25–60 °C) and reaction time (0–30 min) on COD removal of DNP in aqueous solution were investigated, respectively. COD removal reached its maximal value (63.4%) after 15 min treatment due to the synergistic effect in electro/AIS/PS system under the optimal conditions. Furthermore, comparative studies of 7 different experimental processes were setup. In addition, the reasonable DNP degradation pathway was proposed based on intermediates detected by HPLC. According to characterization analysis of SEM-EDS, XRD and XPS of the generated flocculation in electro/AIS/PS system, the possible reaction mechanism was proposed in detail. In a word, the electrolysis process coupled with annular iron sheet as anode activating persulfate technology shows a significant synergetic effect in enhancing degradation of DNP in aqueous solution.

    更新日期:2017-11-13
  • Ultrasonic-enhanced Fenton-like degradation of bisphenol A using a bio-synthesized schwertmannite catalyst
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-12
    Xiang Li, Yongkui Zhang, Yi Xie, Yu Zeng, Panyu Li, Tonghui Xie, Yabo Wang

    Schwertmannite (Sch) was synthesized by Acidithiobacillus ferrooxidans and used as Fenton-like catalyst for bisphenol A (BPA) degradation combining with ultrasonic technology (US). Physicochemical characterizations showed that the bio-synthesized Sch particles had a pompon-like morphology with high BET surface area of 92.92 m2/g. The degradation reaction showed a two-stage pseudo-first-order kinetic process consisting of an induction period and a followed rapid degradation period. A synergistic effect existed between US and Sch on activating H2O2 and the synergy factor was calculated to be 2.32. The catalytic efficiency of the system was mainly affected by pH, Sch dosage and temperature, but less relevant to H2O2 concentration. Free radical dot OH radicals in the bulk solution were identified to be the dominant oxidant, which were produced by both heterogeneous and homogeneous processes. The promotional effect of US on Fenton-like degradation of BPA can be ascribed to the reasons of (1) increasing the radical generation by ultrasonic cavitation; (2) reducing the apparent activation energies of degradation reaction; (3) accelerating the dissolution of iron and (4) keeping the high surface area of catalyst by continuous surface cleaning. Ecotoxicity tests indicated lower toxicities of intermediates than BPA. In addition, Sch exhibited high reusability in the recycle study.

    更新日期:2017-11-13
  • Highly Selective and Efficient Adsorption of Hg2+ by a Recyclable Aminophosphonic Acid Functionalized Polyacrylonitrile Fiber
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-11
    Gang Xu, Lu Wang, Yujia Xie, Minli Tao, Wenqin Zhang

    Mercury ions, even an ultra-trace amount in water, present a serious environmental concern. Hence, searching for cost-effective and high-performance Hg2+ adsorbents has acquired increasingly attention but still remained challenging. In this work, aminophosphonic acid was immobilized onto polyacrylonitrile fiber by chemical grafting approaches. The functionalized fiber (PANAPF) possessed high adsorption selectivity and efficiency for Hg2+ when compared with other coexisting ions viz. Pb2+, Cd2+, Ag+, Zn2+, Cu2+, Ni2+, Co2+, Ca2+ and Mg2+. The adsorption results revealed that PANAPF exhibited high removal capacities for Hg2+ over a wide pH range from 3 to 11. The adsorption process was better described by the pseudo second-order kinetic model, indicating the chemical interaction between Hg2+ and active groups on the PANAPF. Moreover, the maximum adsorption capacity as calculated from the Langmuir adsorption model of 358 mg g−1 was higher than that of many other adsorbents. The PANAPF could be reused more than 10 times and it is able to decrease Hg2+ below 50 μg L−1 which is the maximum discharge standard for mercury containing wastewater in China. A continuous-flow process was also implemented to remove Hg2+. The results suggested the environmentally friendly PANAPF could be a promising candidate for Hg2+ removal in wastewater treatment.

    更新日期:2017-11-11
  • Sorption-desorption of antimony species onto calcined hydrotalcite: surface structure and control of competitive anions
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-10
    Leonel Vinicius Constantino, Juliana Nunes Quirino, Taufik Abrão, Paulo Sérgio Parreira, Alexandre Urbano, Maria Josefa Santos

    Calcined hydrotalcite can be applied to remove anionic contaminants from aqueous systems such as antimony species due to its great anion exchange capacity and high surface area. Hence, this study evaluated antimonite and antimonate sorption-desorption processes onto calcined hydrotalcite in the presence of nitrate, sulfate and phosphate. Sorption and desorption experiments of antimonite and antimonate were carried out in batch equilibrium and the post-sorption solids were analyzed by X-ray Fluorescence (EDXRF). Sorption data were better fitted by dual-mode Langmuir-Freundlich model (R2>0.99) and desorption data by Langmuir model. High maximum sorption capacities were found for the calcined hydrotalcite, ranging from 617 to 790 meq kg−1. The competing anions strongly affected the antimony sorption. EDXRF analysis and mathematical modelling showed that sulfate and phosphate presented higher effect on antimonite and antimonate sorption, respectively. High values for sorption efficiency (SE=99%) and sorption capacity were attributed to the sorbent small particles and the large surface area. Positive hysteresis indexes and low mobilization factors (MF>3%) suggest very low desorption capacity to antimony species from LDH. These calcined hydrotalcite characteristics are desirable for sorption of antimony species from aqueous solutions.

    更新日期:2017-11-10
  • Changes in element availability induced by sterilization in heavy metal contaminated substrates: A comprehensive study
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-10
    Thomas Krauße, Eileen Schütze, René Phieler, David Fürst, Dirk Merten, Georg Büchel, Erika Kothe

    Microbiome analyses of soils and microcosm experiments depend on conditions that include sterilization in order to perform experimental manipulation of microbial communities. Still, they should represent conditions close to nature. When using metal contaminated soils, sterilization methods might alter metal availability. Here, four typical metal contaminated substrates were analyzed, representing different contamination histories and soil types. They included two very poor substrates, as they are often found at metal contaminated sites. The low contents in organic carbon and nitrogen as well as two substrates with slightly higher nutrient availability were used to perform a comprehesive study for element availability changes induced by sterilization. Autoclaving, dry heat or gamma raγ sterilization were applied and compared to a non-treated control. The sterile substrates were analyzed using sequential extraction to account for different associations of the elements. Metals forming specific (hydro)oxide layers were specifically analyzed since they in turn may also impact other metals or ions. In addition, (heavy) metals and (micro)nutrients were analyzed for changes in speciation. The effects of autoclaving (wet heat) was found acceptable, while γ-ray irradiation did show unexpected extensive changes in metal associations, especially for one substrate. Dry heat changed metal availability to the highest degree.

    更新日期:2017-11-10
  • Influence of compost and biochar on microbial communities and the sorption/degradation of PAHs and NSO-substituted PAHs in contaminated soils
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-10
    Gabriel Sigmund, Caroline Poyntner, Guadalupe Piñar, Melanie Kah, Thilo Hofmann

    Diffusely contaminated soils often remain untreated as classical remediation approaches would be disproportionately expensive. Adding compost can accelerate the biodegradation of organic contaminants and adding biochar can immobilize contaminants through sorption. The combined use of compost and biochar to reduce polycyclic aromatic hydrocarbon (PAH) and NSO-substituted PAH contamination has, however, not previously been systematically investigated. We have therefore investigated the processes involved (i) through sorption batch experiments, (ii) by monitoring changes in bacterial, fungal and archaeal communities using denaturing gradient gel electrophoresis, and (iii) through degradation experiments with fluorene, phenanthrene, pyrene, carbazole, dibenzothiophene, and dibenzofuran. Sorption coefficients for organic contaminants in soils increased tenfold following 10% compost addition and up to a hundredfold with further addition of 5% biochar. The rate of PAH and NSO-PAH degradation increased up to twofold following compost addition despite increased sorption, probably due to the introduction of additional microbial species into the autochthonous soil communities. In contrast, degradation of PAHs and NSO-PAHs in soil-compost-biochar mixtures slowed down up to tenfold due to the additional sorption, although some degradation still occurred. The combined use of biochar and compost may therefore provide a strategy for immobilizing PAHs and NSO-PAHs and facilitating degradation of remaining accessible contaminant fractions.

    更新日期:2017-11-10
  • Quantifying the interactions among metal mixtures in toxicodynamic process with generalized linear model
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-10
    Jianfeng Feng, Yongfei Gao, Yijun Ji, Lin Zhu

    Predicting the toxicity of chemical mixtures is difficult because of the additive, antagonistic, or synergistic interactions among the mixture components. Antagonistic and synergistic interactions are dominant in metal mixtures, and their distributions may correlate with exposure concentrations. However, whether the interaction types of metal mixtures change at different time points during toxicodynamic (TD) processes is undetermined because of insufficient appropriate models and metal bioaccumulation data at different time points. In the present study, the generalized linear model (GLM) was used to illustrate the combined toxicities of binary metal mixtures, such as Cu–Zn, Cu–Cd, and Cd–Pb, to zebrafish larvae (Danio rerio). GLM was also used to identify possible interaction types among these method for the traditional concentration addition (CA) and independent action (IA) models. Then the GLM were applied to quantify the different possible interaction types for metal mixture toxicity (Cu–Zn, Cu–Cd, and Cd–Pb to D. rerio and Ni–Co to Oligochaeta Enchytraeus crypticus) during the TD process at different exposure times. We found different metal interaction responses in the TD process and interactive coefficients significantly changed at different exposure times (p < 0.05), which indicated that the interaction types among Cu–Zn, Cu–Cd, Cd–Pb and Ni–Co were time dependent. Our analysis highlighted the importance of considering joint actions in the TD process to understand and predict metal mixture toxicology on organisms. Moreover, care should be taken when evaluating interactions in toxicity prediction because results may vary at different time points. The GLM could be an alternative or complementary approach for BLM to analyze and predict metal mixture toxicity.

    更新日期:2017-11-10
  • Tuning role and mechanism of paint sludge for characteristics of sewage sludge carbon: Paint sludge as a new macro-pores forming agent
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-07
    Siyang Li, Jinxi Feng, Shuanghong Tian, Shenyu Lan, Chao Fan, Xiaosheng Liu, Ya Xiong

    For the first time, paint sludge waste (PS) was used as a pore forming agent in the preparation of sewage sludge derived carbon (SC). The tuning role and mechanism of PS for characteristics of SC were explored. It was found that a sludge carbon (SCPS-Zn) with rich macro-, meso- and micro- porous could be produced by one-step pyrolytic process of sludge in the presence of PS and ZnCl2. Its surface area could reach as high as 680.5 m2 g−1 as 88.4 times and 4.8 times of sludge carbon without addition of PS and ZnCl2 (SC) and only addition of ZnCl2 (SCZn), respectively. The macro- pores fabricated by PS provided much inner-space for ZnCl2 to generate meso- and micro- porous, leading to a hierarchical porous structure. SCPS-Zn showed a high adsorption capacity of 685.4 mg g−1 for Chrysophenine, which is 1.3 and 1.7 times that of SCPS and SCZn respectively. The adsorption difference could be simply attributed to the fact that the great molecules were difficult to enter micro- pores of SCZn. It was also found that the difference was also dependent on orientation of Chrysophenine, which was related to pH value of solution.

    更新日期:2017-11-10
  • An innovative method for the solidification/stabilization of PAHs-contaminated soil using sulfonated oil
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-07
    Fujun Ma, Bin Wu, Qian Zhang, Deshan Cui, Qingbing Liu, Changsheng Peng, Fasheng Li, Qingbao Gu

    Stabilization/solidification (S/S) has been successfully employed in many superfund sites contaminated with organic materials. However, this method’s long-term effectiveness has not been fully evaluated and the increase in soil volume following treatment is unfavorable to follow-up disposal. The present study developed a novel method for the S/S of PAHs-contaminated soil with the facilitation of sulfonated oil (SO). Adding SO significantly improved the unconfined compressive strength (UCS) values of Portland cement and activated carbon (PC-AC) treated soil samples, and the UCS values of the soil sample treated with 0.02% of SO were up to 2.3 times higher than without SO addition. When the soil was treated with PC-AC-SO, the PAHs leaching concentrations were 14%–25% of that in leachates of the control soil, and high molecular weight PAHs including benzo(a)pyrene were rarely leached. Freeze/thaw durability tests reveal that the leachability of PAHs was not influenced by freeze-thaw cycles. The UCS values of PC-AC-SO treated soil samples were 2.2–3.4 times greater than those of PC-AC treated soil samples after 12 freeze-thaw cycles. The PC-AC-SO treated soils resist disintegration better when compared to the PC-AC treated soils. The SEM micrographs reveal that the soils’ compactness was significantly improved when treated with SO.

    更新日期:2017-11-10
  • New insights into bisphenols removal by nitrogen-rich nanocarbons: Synergistic effect between adsorption and oxidative degradation
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-07
    Peiyuan Xiao, Pei Wang, Huimin Li, Qiuyun Li, Yanpeng Shi, Xi-Lin Wu, Hongjun Lin, Jianrong Chen, Xiengke Wang

    In this work, nitrogen-rich graphene-like carbon sheets (N-GLCS) with high specific surface area (488.4 m2/g), narrow pore distribution and high N-doping (18.4 at%) were prepared and applied as both adsorbent and catalyst for the removal of bisphenols. Adsorption experiments demonstrated the high adsorption capacities of the N-GLCS toward bisphenol F (BPF) (222.9 mg/g), bisphenol A (BPA) (317.8 mg/g), and bisphenol C (BPC) (540.4 mg/g). Results showed that about 98.6% of BPA (70 mg/L) was removed at pH 7.0 within 80 min after the adsorption-catalytic degradation process. The N-GLCS also showed a superb reusability for the catalytic oxidative degradation of BPA (70 mg/L) with the removal percentage maintains over 83% after 5 cycles. With the synergistic combination of the excellent adsorption and catalytic properties of the N-GLCS, trace amount of pollutants can be preconcentrated and immobilized at the surface of N-GLCs, at the same time, active radicals were also produced at the surface of the N-GLCS by the activation of peroxydisulfate (PS), and finally the pollutants can be degraded in-situ by the active radicals. These findings provide a new avenue towards the efficient removal of trace-level EDCs from water solution by using the coupled adsorption-advanced oxidation processes.

    更新日期:2017-11-10
  • New Hybrid Adsorbent Based on Porphyrin Functionalized Silica for Heavy Metals Removal: Synthesis, Characterization, Isotherms, Kinetics and Thermodynamics Studies
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-07
    Smaail Radi, Chahrazad El Abiad, Nuno M.M. Moura, Maria A.F. Faustino, M. Graça P.M.S. Neves

    The pollution of water resources due to the disposal of toxic heavy metals has been a growing global concern for the last decades. For this purpose, the search for effective and economic material based adsorbents is required, due to the efficiency of the process. In this work, a novel inorganic-organic hybrid material based on silica chemically modified with a porphyrin (SiNTPP), with a high metal removal efficiency, was developed. The new material was characterized using a set of suitable techniques such as 13C NMR of the solid state, elemental analysis, FTIR, nitrogen adsorption-desorption isotherm, BET surface area, BJH pore sizes and scanning electron microscopy (SEM). The new material surface exhibits good chemical and thermal stability based on the obtained thermogravimetric curves (TGA). An adsorption study was accomplished to investigate the effect of porphyrin-silica hybrid on the removal of Pb(II), Zn(II), Cd(II) and Cu(II) from aqueous solutions using a batch method. The effect of various parameters, such as initial metal concentration, pH, temperature, as well as the kinetics and thermodynamics for sorption on SiNTPP were investigated. The studies demonstrate that adsorption is fast, as proved by the achievement of equilibrium within 25 min. The metals removal from aqueous solution are better adapted to the Langmuir isotherm model than to the Freundlich model. The thermodynamic parameters (ΔG°, ΔH° and ΔS°) disclose that the process was endothermic and spontaneous in nature, and the adsorption process follows a pseudo-second order kinetics. The adsorbent can be regenerated continuously without affecting its extraction percentage. Its effectiveness is highly justified compared to previous described materials.

    更新日期:2017-11-10
  • Sorption and desorption of 17α-ethinylestradiol onto sediments affected by rhamnolipidic biosurfactants
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-07
    Yan-Ping Guo, Yong-You Hu, Hui Lin, Xue-Lian Ou

    Many studies have addressed the desorption and mobilization performances of sorbed contaminants affected by different rhamnolipidic biosurfactants. Study results have been mixed and complicated. Rhamnolipids are always microbial produced with variable homologues. In this study, two representative rhamnolipidic fractions (i.e., RL-F1 and RL-F2, which are mono- and di-rhamnolipids, respectively) were investigated and compared to determine their influence on 17α-ethynylestradiol (EE2) distribution within sediment-water sorption and desorption systems. In general, the coexistence of RL-F1 and EE2 enhanced EE2 sorption in a wider monorhamnolipidic dosage range when freshly treated sorbate was used. The sorbed EE2 concentration decreased as the RL-F1 dosage increased in the aged sorbate desorption systems. However, RL-F2 facilitated EE2 mobilization in both sorption and desorption processes. Experimental data were estimated using a conceptual model that considered the sorbed rhamnolipids and aqueous micelles for organic partitioning. The model results indicated that the rhamnolipid type is an important factor influencing organic distribution, in addition to sorbate aging process and sediment characteristics. The use of a rhamnolipidic mixture containing both mono- and di-rhamnosyl components may not achieve the desired effect when the biosurfactant-enhanced mobilization or immobilization approach is selected. These results $L̫VxnLE$L̫Vxning and applying rhamnolipids to remediate contaminants.

    更新日期:2017-11-10
  • Analysis of Contaminated Nuclear Plant Steel by Laser-Induced Breakdown Spectroscopy
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-07
    Adam Lang, Dirk Engelberg, Nicholas T. Smith, Divyesh Trivedi, Owen Horsfall, Anthony Banford, Philip A. Martin, Paul Coffey, William R. Bower, Clemens Walther, Martin Weiß, Hauke Bosco, Alex Jenkins, Gareth T.W. Law

    Laser Induced Breakdown Spectroscopy (LIBS) has the potential to allow direct, standoff measurement of contaminants on nuclear plant. Here, LIBS is evaluated as an analytical tool for measurement of Sr and Cs contamination on type 304 stainless steel surfaces. Samples were reacted in model acidic (PUREX reprocessing) and alkaline (spent fuel ponds) Sr and Cs bearing liquors, with LIBS multi-pulse ablation also explored to measure contaminant penetration. The Sr II (407.77 nm) and Cs I (894.35 nm) emission lines could be separated from the bulk emission spectra, though only Sr could be reliably detected at surface loadings > 0.5 mg cm−2. Depth profiling showed decay of the Sr signal with time, but importantly, elemental analysis indicated that material expelled from LIBS craters is redistributed and may interfere in later laser shot analyses.

    更新日期:2017-11-10
  • Field-scale multi-phase LNAPL remediation: validating a new computational framework against sequential field pilot trials
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-04
    Kaveh Sookhak Lari, Colin D. Johnston, John L. Rayner, Greg B. Davis

    Remediation of subsurface systems, including groundwater, soil and soil gas, contaminated with light non-aqueous phase liquids (LNAPLs) is challenging. Field-scale pilot trials of multi-phase remediation were undertaken at a site to determine the effectiveness of recovery options. Sequential LNAPL skimming and vacuum-enhanced skimming, with and without water table drawdown were trialled over 78 days; in total extracting over 5 m3 of LNAPL. For the first time, a multi-component simulation framework (including the multi-phase multi-component code TMVOC-MP and processing codes) was developed and applied to simulate the broad range of multi-phase remediation and recovery methods used in the field trials. This framework was validated against the sequential pilot trials by comparing predicted and measured LNAPL mass removal rates and compositional changes. The framework was tested on both a Cray supercomputer and a cluster. Simulations mimicked trends in LNAPL recovery rates (from 0.14 to 3 mL/s) across all remediation techniques each operating over periods of 4–14 days over the 78 day trial. The code also approximated order of magnitude compositional changes of hazardous chemical concentrations in extracted gas during vacuum-enhanced recovery. The verified framework enables longer term prediction of the effectiveness of remediation approaches allowing better determination of remediation endpoints and long-term risks.

    更新日期:2017-11-05
  • Statistical comparison of leaching behavior of incineration bottom ash using seawater and deionized water: significant findings based on several leaching methods
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-02
    Ke Yin, Xiaomin Dou, Fei Ren, Wei-Ping Chan, Victor Wei-Chung Chang

    Bottom ashes generated from municipal solid waste incineration have gained increasing popularity as alternative construction materials, however, they contains elevated heavy metals posing a challenge for its free usage. Different leaching methods are developed to quantify leaching potential of incineration bottom ashes meanwhile guide its environmentally friendly application. Yet, there are diverse IBA applications while the in situ environment is always complicated, challenging its legislation. In this study, leaching tests were conveyed using batch and column leaching methods with seawater as opposed to deionized water, to unveil the metal leaching potential of IBA subjected to salty environment, which is commonly encountered when using IBA in land reclamation yet not well understood. Statistical analysis for different leaching methods suggested disparate performance between seawater and deionized water primarily ascribed to ionic strength. Impacts of leachant are metal-specific dependent on leaching methods and have a function of intrinsic characteristics of incineration bottom ashes. Leaching performances were further compared on additional perspectives, e.g. leaching approach and liquid to solid ratio, indicating sophisticated leaching potentials dominated by combined geochemistry. It is necessary to develop application-oriented leaching methods with corresponding leaching criteria to preclude discriminations between different applications, e.g., terrestrial applications vs. land reclamation.

    更新日期:2017-11-05
  • Novel synthesis of cyano-functionalized mesoporous silica nanospheres (MSN) from coal fly ash for removal of toxic metals from wastewater
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-01
    Bangda Wang, Yuexi Zhou, Lei Li, Hui Xu, Yinglong Sun, Yi Wang

    Trace amounts of toxic metals are usually difficult to be purified by conventional chemical precipitation or physical adsorption in wastewater. In this study, in order to realize high-value utilization of coal fly ash for wastewater purification, a novel method was applied to prepare high-performance mesoporous silica materials from coal fly ash. In comparison with a commonly used method, characterizations revealed that the new method obtained mesoporous silica nanospheres with uniformly distributed cyano groups (denoted by MSN), while the common method only obtained irregular sponge-like microstructure (denoted by ISM). Besides, MSN showed better hydrothermal stability, higher specific surface area (693 m2/g) and more ordered mesopores from the comparison. Moreover, the sorption experiments of simulated wastewater suggested that MSN was better in removing toxic metals (Ni2+ and Cd2+) than ISM. For the practical wastewater from a battery plant, 2 g/L dosage of MSN showed excellent performance for purification of trace amounts of various toxic metals (Ni, Cd, Mn, Zn, Hg and Pb), the concentration of which reduced to ppb level after MSN treated. The results suggested that MSN can be an effective and low-cost sorbent for removing various toxic metals from wastewater.

    更新日期:2017-11-02
  • A novel method of utilization of hot dip galvanizing slag using the heat waste from itself for protection from radiation
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-01
    Mengge Dong, Xiangxin Xue, Ashok Kumar, He Yang, M.I. Sayyed, Shan Liu, Erjun Bu
    更新日期:2017-11-02
  • Carbon nano tubes functionalized with novel functional group- amido-amine for sorption of actinides
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-01
    A.K. Singh Deb, S. Pahan, K. Dasgupta, S. Panja, A.K. Debnath, P.S. Dhami, Sk. M. Ali, C.P. Kaushik, J.S. Yadav
    更新日期:2017-11-02
  • Radioactive Iodine Capture and Storage from Water using Magnetite Nanoparticles Encapsulated in Polypyrrole
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-11-01
    Dilip K.L. Harijan, Vimlesh Chandra, Taeseung Yoon, Kwang S. Kim
    更新日期:2017-11-02
  • Experimental investigation of the inerting effect of crystalline II type Ammonium Polyphosphate on explosion characteristics of micron-size Acrylates Copolymer dust
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-31
    Yuan Yu, Yunhao Li, Qingwu Zhang, Weishun Ni, Juncheng Jiang

    The inerting effect of crystalline II type Ammonium Polyphosphate (APP-II) on explosion characteristics of micron-size Acrylates Copolymer (ACR) powders was experimentally studied. The inerting mechanism was analysed by combining thermogravimetry (TG) and differential scanning calorimetry (DSC) tests. The results indicated that the maximum explosion pressure (Pmax) and explosion index (Kst) was 10.4 bar and 416 bar m/s, respectively for ACR powders. The minimum explosion concentration (MEC) of ACR powders ranged from 20 to 30 g/m3, and the experimental minimum ignition energy (MIE) of the ACR dust cloud was 10 mJ. Therefore, ACR dust was determined to be severely combustible dust. There existed a minimum inerting concentration (MIC), and the explosion of ACR powders can be inerted completely by 80 wt% APP-II. Furthermore, 30 and 40 wt% APP-II had a significant inerting effect on the MIE of ACR dust.According to TG and DSC tests, thermal stability of ACR would be augmented by the introduction of APP-II. The addition of APP-II triggered lower maximum mass loss rate (MMLR), higher temperature corresponding to mass loss of 90% (T0.1), chars yield, and endothermic peaks. Consequently, the ACR dust explosion was inerted by the chemical interaction of ACR/APP-II mixtures and endothermic decomposition of APP-II.

    更新日期:2017-11-01
  • 更新日期:2017-11-01
  • Investigation of Cr(VI) reduction potential and mechanism by Caldicellulosiruptor saccharolyticus under glucose fermentation condition
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-29
    Ya-Nan Bai, Yong-Ze Lu, Nan Shen, Tai-Chu Lau, Raymond Jianxiong Zeng
    更新日期:2017-10-30
  • Assessment of reactive oxygen species generated by electronic cigarettes using acellular and cellular approaches
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-29
    Jiayuan Zhao, Yipei Zhang, Jennifer D. Sisler, Justine Shaffer, Stephen S. Leonard, Anna M. Morris, Yong Qian, Dhimiter Bello, Philip Demokritou

    Electronic cigarettes (e-cigs) have fast increased in popularity but the physico-chemical properties and toxicity of the generated emission remain unclear. Reactive oxygen species (ROS) are likely present in e-cig emission and can play an important role in e-cig toxicity. However, e-cig ROS generation is poorly documented. Here, we generated e-cig exposures using a recently developed versatile exposure platform and performed systematic ROS characterization on e-cig emissions using complementary acellular and cellular techniques: 1) a novel acellular Trolox-based mass spectrometry method for total ROS and hydrogen peroxide (H2O2) detection, 2) electron spin resonance (ESR) for hydroxyl radical detection in an acellular and cellular systems and 3) in vitro ROS detection in small airway epithelial cells (SAEC) using the dihydroethidium (DHE) assay. Findings confirm ROS generation in cellular and acellular systems and is highly dependent on the e-cig brand, flavor, puffing pattern and voltage. Trolox method detected a total of 1.2-8.9 nmol H2O2eq./puff; H2O2 accounted for 12-68% of total ROS. SAEC cells exposed to e-cig emissions generated up to eight times more ROS compared to control. The dependency of e-cig emission profile on e-cig features and operational parameters should be taken into consideration in toxicological studies.

    更新日期:2017-10-30
  • Experimental study on ignition mechanisms of wet granulation sulfur caused by friction
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-29
    Haoyuan Dai, Jianchun Fan, Shengnan Wu, Yanqiu Yu, Di Liu, Zhibin Hu

    It is common to see fire accidents caused by friction during the storage and transportation of wet granulation sulfur. To study the sulfur ignition mechanism under friction conditions, a new rotating test apparatus is developed to reproduce friction scenes at lab scale. A series of experiments are performed under different normal loads. The SEM-EDS and the XRD were utilized to examine the morphologies and compositions of the tested specimens and the friction products. Experimental results show that these two methods are mostly in agreement with each other. The iron-sulfide compounds are produced and the proportion of iron-sulfide compounds is reduced with normal loads increasing, compared to the total number of the friction products. The facts implied by the integration analysis of friction products with the temperature changes of the near friction surface unveil an underlying mechanism that may explain sulfur ignition by friction in real scenarios. The sulfur ignition may be mainly caused by the spontaneous combustion of iron sulfide compounds produced by friction under low normal load with 200N. With the increase of normal loads, the resulting iron-sulfide compounds are decreasing and the high temperature from friction heat begins to play a major role in causing fire.

    更新日期:2017-10-30
  • Joint release rate estimation and measurement-by-measurement model correction for atmospheric radionuclide emission in nuclear accidents: An application to wind tunnel experiments
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-29
    Xinpeng Li, Hong Li, Yun Liu, Wei Xiong, Sheng Fang

    The release rate of atmospheric radionuclide emissions is a critical factor in the emergency response to nuclear accidents. However, there are unavoidable biases in radionuclide transport models, leading to inaccurate estimates. In this study, a method that simultaneously corrects these biases and estimates the release rate is developed. Our approach provides a more complete measurement-by-measurement correction of the biases with a coefficient matrix that considers both deterministic and stochastic deviations. This matrix and the release rate are jointly solved by the alternating minimization algorithm. The proposed method is generic because it does not rely on specific features of transport models or scenarios. It is validated against wind tunnel experiments that simulate accidental releases in a heterogonous and densely built nuclear power plant site. The sensitivities to the position, number, and quality of measurements and extendibility of the method are also investigated. The results demonstrate that this method effectively corrects the model biases, and therefore outperforms Tikhonov’s method in both release rate estimation and model prediction. The proposed approach is robust to uncertainties and extendible with various center estimators, thus providing a flexible framework for robust source inversion in real accidents, even if large uncertainties exist in multiple factors.

    更新日期:2017-10-30
  • Heterologous expression and characterization of three laccases obtained from Pleurotus ostreatus HAUCC 162 for removal of environmental pollutants
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-28
    Rui Zhuo, Hongbo Yu, Peng Yuan, Jiahui Fan, Longjiao Chen, Yuan Li, Fuying Ma, Xiaoyu Zhang
    更新日期:2017-10-28
  • Adsorptive removal of indole and quinoline from model fuel using adenine-grafted metal-organic frameworks
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-28
    Mithun Sarker, Ji Yoon Song, Ah Rim Jeong, Kil Sik Min, Sung Hwa Jhung
    更新日期:2017-10-28
  • Investigating binding characteristics of cadmium and copper to DOM derived from compost and rice straw using EEM-PARAFAC combined with two-dimensional FTIR correlation analyses
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-28
    Mei Huang, Zhongwu Li, Bin Huang, Ninglin Luo, Qiu Zhang, Xiuqing Zhai, Guangming Zeng
    更新日期:2017-10-28
  • A novel fungal arsenic methyltransferase, WaarsM reduces grain arsenic accumulation in the transgenic rice plant
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-28
    Shikha Verma, Pankaj Kumar Verma, Alok Kumar Meher, Amit Kumar Bansiwal, Rudra Deo Tripathi, Debasis Chakrabarty

    Rice (Oryza sativa L.) grown on arsenic-containing soil and water become a primary dietary source of arsenic and pose a significant health risk. Gene modification is an important and practical approach to reduce arsenic accumulation in rice grains. Here, we reported a WaarsM gene of soil fungus Westerdykella aurantiaca, expressed in rice able to convert toxic inorganic arsenicals to methylated arsenic species, therefore, reduce arsenic accumulation in rice grains. In response to arsenic treatment in hydroponics, WaarsM expressing transgenic lines showed a marked increase in arsenic resistance and reduced its accumulation compared to NT. Also, WaarsM expressing transgenic Line 1 evolved c.a. 157 ng and c.a. 43 ng volatile arsenicals (mg−1 fresh weight) after 72 hours of exposure to 25 μM AsIII and 250 μM AsV, respectively. Transgenic line 1, grown in soil irrigated with arsenic-containing water accumulates about 50% and 52% lower arsenic than the NT in shoot and root, respectively; while arsenic concentration in polished seeds and husk of the transgenic line was reduced by 52% compared to NT. Thus, the present study demonstrates that the expression of WaarsM in rice induces arsenic methylation and volatilization, provides a potential strategy to reduce arsenic accumulation in rice grain.

    更新日期:2017-10-28
  • 更新日期:2017-10-28
  • A novel process for preparation of titanium dioxide from Ti-bearing electric furnace slag: NH4HF2-HF leaching and hydrolyzing process
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-28
    Fuqiang Zheng, Yufeng Guo, Guanzhou Qiu, Feng Chen, Shuai Wang, Yulei Sui, Tao Jiang, Lingzhi Yang
    更新日期:2017-10-28
  • Biotransformation and detoxification of selenite by microbial biogenesis of selenium-sulfur nanoparticles
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-27
    M. Vogel, S. Fischer, A. Maffert, R. Hübner, A. Scheinost, C. Franzen, R. Steudtner
    更新日期:2017-10-28
  • Removal and recovery of Critical Rare Elements from contaminated waters by living Gracilaria gracilis
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-27
    Jéssica Jacinto, Bruno Henriques, A.C. Duarte, Carlos Vale, E. Pereira
    更新日期:2017-10-28
  • Evaluating the Diffusive Gradients in Thin Films Technique for the Prediction of Metal Bioaccumulation in Plants Grown in River Sediments
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-25
    Zhixin Song, Baoqing Shan, Wenzhong Tang
    更新日期:2017-10-26
  • Determination of the soil hazardous concentrations of bisphenol A using the species sensitivity approach
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-25
    Jin Il Kwak, Jongmin Moon, Dokyung Kim, Rongxue Cui, Youn-Joo An
    更新日期:2017-10-25
  • Synthesis of thiourea-immobilized polystyrene nanoparticles and their sorption behavior with respect to silver ions in aqueous phase
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-24
    Ji-In Yun, Saurabha Bhattarai, Yeoung-Sang Yun, Youn-Sik Lee
    更新日期:2017-10-25
  • Recent Developments in Nanostructured Inorganic Materials for Sorption of Cesium and Strontium: Synthesis and Shaping, Sorption Capacity, Mechanisms, and Selectivity – A Review
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-24
    Delhia Alby, Clarence Charnay, Marc Heran, Bénédicte Prelot, Jerzy Zajac
    更新日期:2017-10-24
  • Highly ordered TiO2 nanotube arrays wrapped with g-C3N4 nanoparticles for efficient charge separation and increased photoelectrocatalytic degradation of phenol
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-24
    Huan Wang, Yinghua Liang, Li Liu, Jinshan Hu, Wenquan Cui
    更新日期:2017-10-24
  • 更新日期:2017-10-24
  • Identification and Evaluation of Bioremediation Potential of Laccase Isoforms Produced by Cyathus bulleri on Wheat Bran
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-23
    Arpita Vats, Saroj Mishra

    Multiplicity in laccases among lignin degrading fungal species is of interest as it confers the ability to degrade several types of lignocellulosics. The combination of laccases produced on such substrates could be beneficial for treatment of complex aromatics, including dyes. In this study, we report on production of high units (679.6 U g−1 substrate) of laccase on solid wheat bran (WB) by Cyathus bulleri. Laccase, purified from the culture filtrates of WB grown fungus, was effective for oxidation of veratryl alcohol, Reactive blue 21 and several dyes without assistance of externally added mediators. De novo sequencing of the ‘purified’ laccase lead to identification of several peptides that originated from different laccase genes. Transcriptome analysis of the fungus, cultivated on WB, confirmed presence of 8 isozymes, that were re-amplified and sequenced from the cDNA prepared from WB grown fungus. The 8 isozymes were grouped into 3 classes, based on their sequence relationship with other basidiomycete laccases. The isoforms produced on WB decolorized (by ∼57%) and degraded textile effluent far more effectively, compared to laccase obtained from Basal salt cultivated fungus. The decolorization and degradation was also accompanied by more than 95% reduction in phytotoxicity.

    更新日期:2017-10-24
  • Utilization of red mud and Pb/Zn smelter waste for the synthesis of a red mud-based cementitious material
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-23
    Yuan-Cheng Li, Xiao-Bo Min, Yong Ke, Li-Yuan Chai, Mei-Qing Shi, Chong-Jian Tang, Qing-Wei Wang, Yan-Jie Liang, Jie Lei, De-Gang Liu
    更新日期:2017-10-24
  • Synthesis of Au nanoparticle-decorated carbon nitride nanorods with plasmon-enhanced photoabsorption and photocatalytic activity for removing various pollutants from water
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-23
    Yali Chang, Zixiao Liu, Xiaofeng Shen, Bo Zhu, Daniel K. Macharia, Zhigang Chen, Lisha Zhang
    更新日期:2017-10-24
  • Bioaugmentation of strain Methylobacterium sp. C1 towards p-nitrophenol removal with broad spectrum coaggregating bacteria in sequencing batch biofilm reactors
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-20
    Wenlong Yue, Mei Chen, Zhongqin Cheng, Liqun Xie, Mengying Li

    This work was conducted in order to evaluate an instance of bioaugmentation, namely, the addition of a novel p-nitrophenol (PNP)-degrading bacterium Methylobacterium sp. C1 coaggregated with two other broad-spectrum coaggregating strains (Bacillus megaterium T1 and Bacillus cereus G5) within sequence batch biofilm reactors (SBBRs). Results showed that biofilms consisting of C1 and coaggregating bacteria were resistant to shock loads and were more efficient at PNP removal. High-throughput sequencing data revealed that biofilms formed in the presence of the coaggregating bacteria demonstrated greater microbial diversity. These results suggest that broad-spectrum coaggregating bacteria may be capable of mediating the immobilization of exogenous degrading bacteria into biofilms, rendering them more resistant to toxic compounds and environmental stresses. This represents the first attempt to assess the bioaugmentation of PNP-contaminated wastewater treatment through the utilization of broad-spectrum coaggregating bacteria.

    更新日期:2017-10-20
  • Toluene and acetaldehyde removal from air on to graphene-based adsorbents with microsized pores
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-19
    Ji Min Kim, Ji Hoon Kim, Chang Yeon Lee, Dong Wook Jerng, Ho Seon Ahn

    Volatile organic compound (VOC) gases can cause harm to the human body with exposure over the long term even at very low concentrations (ppmv levels); thus, effective absorbents for VOC gas removal are an important issue. In this study, accordingly, graphene-based adsorbents with microsized pores were used as adsorbents to remove toluene and acetaldehyde gases at low concentrations (30 ppm). Sufficient amounts of the adsorbents were prepared for use on filters and were loaded uniformly at 0.1–0.5 g on a 50 × 50 mm2 area, to evaluate their adsorption features with low gas concentrations. The morphology and chemical composition of the adsorbents were characterized using scanning electron microscopy, N2 adsorption–desorption isotherms, X-ray photoelectron spectroscopy, and Raman spectroscopy. Microwave irradiation and heat treatment near 800 °C under KOH activation resulted in enlargement of the pristine graphene surface and its specific surface area; maximum volume capacities of 3,510 m3/g and 630 m3/g were observed for toluene and acetaldehyde gas. The high removal efficiency for toluene (98%) versus acetaldehyde (30%) gas was attributed to π-π interactions between the pristine graphene surface and toluene molecules.

    更新日期:2017-10-20
  • Alkaline hydrothermal stabilization of Cr(VI) in soil using glass and aluminum from recycled municipal solid wastes
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-18
    Concetta Eliana Gattullo, Caterina D’Alessandro, Ignazio Allegretta, Carlo Porfido, Matteo Spagnuolo, Roberto Terzano
    更新日期:2017-10-19
  • Accelerated degradation of sulfamethazine in water by VUV/UV photo-Fenton process: Impact of sulfamethazine concentration on reaction mechanism
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-18
    Dong Wen, Zhengdi Wu, Yubin Tang, Mengkai Li, Zhimin Qiang
    更新日期:2017-10-18
  • Impact of direct application of biogas slurry and residue in fields: in situ analysis of antibiotic resistance genes from pig manure to fields
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-18
    Chengjun Pu, Hang Liu, Guochun Ding, Ying Sun, Xiaolu Yu, Junhao Chen, Jingyao Ren, Xiaoyan Gong

    Biogas slurry and residue contaminated with antibiotics are widely used as fertilizers in vegetable crop planting. However, their impact on the spreading of antibiotic resistance genes (ARGs) in vegetable fields is still largely unknown. In the present study, antibiotic resistant bacteria (ARB), ARGs and bacterial communities from pig manure to fields were monitored by using viable plate counts, high-throughput fluorescent quantitative PCR (HT-qPCR) and Illumina MiSeq sequencing. Eighty-three ARGs and 3 transposons genes were detected. Anaerobic digestion reduced relative abundance of tetracycline and Macrolide-Lincosamide-Streptogramin (MLSB) resistance genes. However, the number of ARB and the relative abundance of sulfa, aminoglycoside and florfenicol, chloramphenicol, and amphenicol (FCA) resistance genes, respectively, enriched up to 270 times and 52 times in biogas residue. Long-term application of biogas slurry and residue contaminated with antibiotics in fields increased the rate of ARB as well as relative abundance of ARGs and transposons genes. Additionally, bacterial communities significantly differed between the soil treated with biogas slurry and residue and the control sample, especially the phyla Bacteroidetes and Actinobacteria. Based on network analysis, 19 genera were identified as possible hosts of the detected ARGs. Our results provide an important significance for reasonable application of biogas slurry and residue.

    更新日期:2017-10-18
  • Application of critical water-alcohol composite medium to treat waste printed circuit boards: Oil phase products characteristic and debromination
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-18
    Fu-Rong Xiu, Yingying Qi, Shengquan Wang, Wenjie Nie, Huiwei Weng, Mengjun Chen
    更新日期:2017-10-18
  • Simultaneous Molybdate (Mo(VI)) Recovery and Hazardous Ions Immobilization via Nanoscale Zerovalent Iron
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-18
    Dongxu Qian, Yiming Su, Yuxiong Huang, Huaqiang Chu, Xuefei Zhou, Yalei Zhang
    更新日期:2017-10-18
  • A new model based on adiabatic flame temperature for evaluation of the upper flammable limit of alkane-air-CO2 mixtures
    J. Hazard. Mater. (IF 6.065) Pub Date : 2017-10-17
    Mingqiang Wu, Gequn Shu, Rui Chen, Hua Tian, Xueying Wang, Yue Wang

    For security issue of alkane used in Organic Rankine Cycle, a new model to evaluate the upper flammability limits for mixtures of alkanes, carbon dioxide and air has been proposed in present study. The linear relationship was found at upper flammability limits between molar fraction of diluent in alkane-CO2 mixture and calculated adiabatic flame temperature. The prediction ability of the variable calculated adiabatic flame temperature model that incorporated the linear relationship above is greatly better than the models that adopted the fixed calculated adiabatic flame temperature at upper flammability limit. The average relative differences between results predicted by the new model and observed values are less than 3.51% for upper flammability limit evaluation. In order to enhance persuasion of the new model, the observed values of n-butane-CO2 and isopentane-CO2 mixtures measured in this study were used to confirm the validity of the new model. The predicted results indicated that the new model possesses the capacity of practical application and can adequately provide safe non-flammable ranges for alkanes diluted with carbon dioxide.

    更新日期:2017-10-17
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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