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Journal of Hazardous Materials

Qiang Wang, Liping Huang, Yuzhen Pan, Xie Quan, Gianluca Li Puma
The role of Fe(III) was investigated as an electron-shuttle mediator to enhance the reduction rate of the toxic heavy metal hexavalent chromium (Cr(VI)) in wastewaters, using microbial fuel cells (MFCs). The direct reduction of chromate (CrO4(-)) and dichromate (Cr2O7(2-)) anions in MFCs was hampered by the electrical repulsion between the negatively charged cathode and Cr(VI) functional groups. In contrast, in the presence of Fe(III), the conversion of Cr(VI) and the cathodic coulombic efficiency in the MFCs were 65...
October 6, 2016: Journal of Hazardous Materials
Mingfei Xing, Zegang Fu, Yaping Wang, Jingyu Wang, Zhiyuan Zhang
In this study, a novel process for the removal of toxic lead from the CRT funnel glass and synchronous preparation of high silica glass powder was developed by a carbon-thermal reduction enhanced glass phase separation process. CRT funnel glass was remelted with B2O3 in reducing atmosphere. In the thermal process, a part of PbO contained in the funnel glass was reduced into metallic Pb and detached from the glass phase. The rest of PbO and other metal oxides (including Na2O, K2O, Al2O3, BaO and CaO) were mainly concentrated in the boric oxide phase...
October 6, 2016: Journal of Hazardous Materials
Jakub Trawiński, Robert Skibiński
The photolytic and photocatalytic transformation of tiapride with the use of TiO2 and H2O2 was investigated. A novel micro-scale method for simultaneous irradiation with simulated full solar spectrum of multiple samples in photostability chamber was proposed. RP-UHPLC-DAD coupled with ESI-Q-TOF mass spectrometer was used for the quantitative and qualitative analysis of the processes. Quantitative method was fully validated, and kinetic parameters of tiapride photodegradation were compared. Structures of twenty-one photoproducts as well as phototransformation pathways were proposed...
October 6, 2016: Journal of Hazardous Materials
Yuanyuan Chen, Jian Li, Jin Wei, Atufa Kawan, Li Wang, Xuezhen Zhang
Cyanobacterial blooms and their associated toxins pose a great threat to human beings. The situation is even worse for those whose drinking water source is a cyanotoxin-polluted water body. Therefore, efficient and safe treatments urgently need to be developed. The present study verified the application of vitamin C on the inhibition of toxic Microcystis aeruginosa. Our results showed that vitamin C drove the Fenton reaction and significantly sterilized cultures of M. aeruginosa. The algicidal activity of vitamin C was dependent on its involvement in iron (Fe) metabolism...
October 6, 2016: Journal of Hazardous Materials
Devrim Kaya, Ipek Imamoglu, F Dilek Sanin, Rayford B Payne, Kevin R Sowers
Aroclor 1254 was the second most produced commercial PCB mixture and is found in soils, sediments and sewage throughout the globe. This commercial PCB mixture is considered particularly toxic because of the relatively high concentrations of congeners with dioxin-like properties. The potential for risk reduction by microbial reductive dechlorination of Aroclor 1254 (A1254) was investigated in sediment microcosms from Grasse River (GR), Massena, NY. The specificity of A1254 dechlorination was doubly- and singly-flanked chlorines in meta positions and to a less extent doubly-flanked para chlorines of 2345-substituted chlorobiphenyl rings...
October 5, 2016: Journal of Hazardous Materials
Febelyn Reguyal, Ajit K Sarmah, Wei Gao
Magnetisation of carbonaceous adsorbent using iron oxide (FexOy) has potential to decrease the recovery cost of spent adsorbent because it could be separated magnetically. However, formation of various phases of FexOy and iron hydroxide (Fex(OH)y) during synthesis particularly the non-magnetic phases are difficult to control and could significantly reduce the magnetic saturation of the adsorbent. Hence, formation of the most magnetic FexOy, Fe3O4, on biochar via oxidative hydrolysis of FeCl2 under alkaline media was performed to synthesise magnetic adsorbent using pine sawdust biochar (magnetic pine sawdust biochar: MPSB)...
October 4, 2016: Journal of Hazardous Materials
Ting Dong, Shengbin Cao, Guangbiao Xu
A depth filtrating system with rotatable and taper-shaped filter column was reported to highly remove and recover oil from wastewater. In the work, structure filters made of kapok fibers were prepared by air-laying-bonding method. The oil removed from wastewater was then recovered from the oil-loaded filter by rotating the filter column, and the resulted filter was reused. The filtrating system demonstrated extremely high oil/water separation in which oil was completely retained by the filter at the first 20-100min while water passed through the filter's body with a flow rate of 560mL/min using 11,500-13,150mg/L vegetable oil or diesel polluted water...
October 4, 2016: Journal of Hazardous Materials
Umamaheswari B, Rama Rajaram
Microaerobic degradation of 2-Mercaptobenzothiazole (2-MBT) was investigated using an isolated bacterial strain CSMB1. It was identified as Alcaligenes sp. MH146 by genomic analysis. The isolate degraded 50mg/L concentration of 2-MBT which was measured in terms of Total organic carbon (TOC) (700mg/L). A maximum degradation of 86% with a residual TOC concentration of 101mg/L was obtained after 72h, with the biomass growth of 290mg/L. The presence of specific activity of catechol 2, 3 oxygenase was observed in all the tested derivatives of benzothiazoles and the benzene ring opening was observed through meta cleavage...
October 3, 2016: Journal of Hazardous Materials
Yim Ling Mak, Jing Li, Chih-Ning Liu, Shuk Han Cheng, Paul K S Lam, Jinping Cheng, Leo L Chan
Ciguatoxins (CTXs) are natural biotoxins produced by benthic dinoflagellates of the genus Gambierdiscus, which are bioaccumulated and biotransformed along food chains in coral ecosystems. They are neurotoxins that activate voltage-gated sodium channels and disrupt ion conductance in the excitable tissues. Pacific ciguatoxin-1 (P-CTX-1) is the most prevalent and potent CTX congener present in fishes from the Pacific Ocean. In this study, P-CTX-1 was administrated to larval marine medaka (2h post-hatch) via microinjection...
October 1, 2016: Journal of Hazardous Materials
Wang Hailei, Li Ping, Wang Ying, Liu Lei, Yao Jianming
Phanerochaete chrysosporium was seeded to a sequencing batch reactor treating phenol wastewater. Compared to the contrast reactor (R1), the bioaugmented reactor (R2) exhibits better performance in sludge settling ability, as well as biomass and phenol removal, even though the added fungus is not persistently surviving in the reactor. Bioaugmentation improved bacterial population, growing up to 10,000 times higher than that of eukaryotes. Metagenomic sequencing results show the bioaugmentation finally increases bacterial and eukaryotic richness, but reduces their community diversity...
October 1, 2016: Journal of Hazardous Materials
Esmaeil Zarei, Ali Azadeh, Nima Khakzad, Iraj Mohammadfam
Pipelines are one of the most popular and effective ways of transporting hazardous materials, especially natural gas. However, the rapid development of gas pipelines and stations in urban areas has introduced a serious threat to public safety and assets. Although different methods have been developed for risk analysis of gas transportation systems, a comprehensive methodology for risk analysis is still lacking, especially in natural gas stations. The present work is aimed at developing a dynamic and comprehensive quantitative risk analysis (DCQRA) approach for accident scenario and risk modeling of natural gas stations...
October 1, 2016: Journal of Hazardous Materials
M Gil-Díaz, P Pinilla, J Alonso, M C Lobo
The effectiveness of single- and multi-metal(loid) immobilization of As, Cd, Cr, Pb and Zn using different doses of nanoscale zero-valent iron (nZVI) was evaluated and compared in two different soils, a calcareous and an acidic one. The effectiveness of nZVI to immobilize metal(loid)s in soil strongly depended on the metal characteristics, soil properties, dose of nZVI and presence of other metal(loid)s. In the case of single contamination, this nanoremediation strategy was effective for all of the metal(loid)s studied except for Cd...
September 30, 2016: Journal of Hazardous Materials
Chunsheng Lei, Xiaofeng Zhu, Bicheng Zhu, Chuanjia Jiang, Yao Le, Jiaguo Yu
The preparation of hierarchical porous materials as catalysts and sorbents has attracted much attention in the field of environmental pollution control. Herein, Ni/Mg/Al layered double hydroxides (NMA-LDHs) hierarchical flower-like hollow microspheres were synthesized by a hydrothermal method. After the NMA-LDHs was calcined at 600°C, NMA-LDHs transformed into Ni/Mg/Al layered double oxides (NMA-LDOs), which maintained the hierarchical flower-like hollow structure. The crystal phase, morphology, and microstructure of the as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy elemental mapping, Fourier transform infrared spectroscopy, and nitrogen adsorption-desorption methods...
September 30, 2016: Journal of Hazardous Materials
Mengjie Fan, Nannan Zhou, Peiwen Li, Liuliu Chen, Yingwen Chen, Shubao Shen, Shemin Zhu
Tetrabromobisphenol A(TBBPA), a pollutant in industrial wastewaters, needs to be removed due to its high toxicity and persistence. The main biodegradation pathway for TBBPA has been studied, and bisphenol A(BPA), which is toxic to the environment, is recognized as the general terminal product. In this study, we explored a new approach for the anaerobic biodegradation of TBBPA in a bioelectrochemical system (BES) through co-metabolic degradation of TBBPA with glucose. The half-life of TBBPA was significantly reduced to 13...
September 29, 2016: Journal of Hazardous Materials
Di Gu, Nan Shao, Yanji Zhu, Hongjun Wu, Baohui Wang
The STEP concept has successfully been demonstrated for driving chemical reaction by utilization of solar heat and electricity to minimize the fossil energy, meanwhile, maximize the rate of thermo- and electrochemical reactions in thermodynamics and kinetics. This pioneering investigation experimentally exhibit that the STEP concept is adapted and adopted efficiently for degradation of nitrobenzene. By employing the theoretical calculation and thermo-dependent cyclic voltammetry, the degradation potential of nitrobenzene was found to be decreased obviously, at the same time, with greatly lifting the current, while the temperature was increased...
September 29, 2016: Journal of Hazardous Materials
Guifang Liu, Xuchun Li, Bangjun Han, Liwei Chen, Linan Zhu, Luiza C Campos
Fenton or Fenton-like processes have been regarded as feasible methods to degrade a wide variety of contaminants by generating reactive species, but the efficiency is still challenged by the slow transformation from Fe(III) to Fe(II) and pH. This study employed hydroxylamine (HA) to improve the oxidation efficiency of Fe(II)/HSO5(-) (Fe(II)/PMS) process, by selecting sulfamethoxazole (SMX) as the target compound. The degradation efficiency and mechanism of SMX by the HA/Fe(II)/PMS process were elucidated for the first time...
September 28, 2016: Journal of Hazardous Materials
Pierre Le Pape, Fabienne Battaglia-Brunet, Marc Parmentier, Catherine Joulian, Cindy Gassaud, Lidia Fernandez-Rojo, Jean-Michel Guigner, Maya Ikogou, Lucie Stetten, Luca Olivi, Corinne Casiot, Guillaume Morin
Acid mine drainages (AMD) are major sources of pollution to the environment. Passive bio-remediation technologies involving sulfate-reducing bacteria (SRB) are promising for treating arsenic contaminated waters. However, mechanisms of biogenic As-sulfide formation need to be better understood to decontaminate AMDs in acidic conditions. Here, we show that a high-As AMD effluent can be decontaminated by an indigenous SRB consortium. AMD water from the Carnoulès mine (Gard, France) was incubated with the consortium under anoxic conditions and As, Zn and Fe concentrations, pH and microbial activity were monitored during 94days...
September 28, 2016: Journal of Hazardous Materials
Siqi Li, Xiaodan Zhang, Yuming Huang
The nanoporous carbons (NPC) derived from a one-step carbonization of zeolitic imidazolate framework-8 (ZIF-8) were synthesized and used for ciprofloxacin (CIP) removal from water. The resultant products were characterized by SEM, TEM, FT-IR, Raman, N2 adsorption-desorption analysis, XRD, TGA and Zeta potential. The optimized NPC-700 (carbonized at 700°C for 2h) exhibited an optimal performance in CIP adsorption removal. CIP adsorption on NPC-700 as a function of contact time, initial CIP concentration, adsorbent dosage, pH, ionic strength and humic acid concentration were investigated...
September 28, 2016: Journal of Hazardous Materials
Prem Rajak, Moumita Dutta, Salma Khatun, Moutushi Mandi, Sumedha Roy
This study reveals protective role of l-ascorbic acid (25, 50 and 100μg/mL) against toxic impacts of acute sub-lethal exposure of Acephate (5μg/mL) in a non-target organism Drosophila melanogaster. Organismal effect was evident from increased impairment in climbing activities (9 folds) of treated individuals who also manifested altered ocular architecture. These anomalies were reduced with l-ascorbic acid (l-AA) supplementation. Acephate induced apoptotic lesions in eye imaginal discs and gut confirmed tissue damage that also reduced with l-AA co-treatment...
September 28, 2016: Journal of Hazardous Materials
Ilya Perederiy, Vladimiros G Papangelakis
It has been shown previously that amorphous FeO-SiO2 slags are not amenable to high pressure oxidative acid leaching - unlike their crystalline counterparts. Independent studies of glass and silicate mineral dissolution at ambient conditions suggest that acid attack can be hindered by the formation of a passive silica layer. The current work extends this finding to the case of high temperature dissolution of amorphous FeO-SiO2 slags by providing evidence for the formation of a passive silica layer within slag particles under high pressure oxidative acid leaching conditions (250°C, 70g/L initial H2SO4, 0...
September 24, 2016: Journal of Hazardous Materials
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