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Journal of Hazardous Materials

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https://www.readbyqxmd.com/read/28314194/electrocatalytic-reduction-of-low-concentration-thiamphenicol-and-florfenicol-in-wastewater-with-multi-walled-carbon-nanotubes-modified-electrode
#1
Dongli Deng, Fei Deng, Bobin Tang, Jinzhong Zhang, Jiang Liu
The electrocatalytic reduction of thiamphenicol (TAP) and florfenicol (FF) was investigated with multi-walled carbon nanotubes (MWCNTs) modified electrode. MWCNTs was dispersed in pure water with the assistance of dihexadecyl phosphate (DHP), and then modified on glassy carbon electrode (GCE). The electrocatalytic reduction conditions, such as bias voltage, supporting electrolyte and its initial pH, and the initial concentrations of TAP and FF, were also optimized. The experimental results indicated that the removal efficiencies of 2mgL(-1) TAP and FF in 0...
March 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28324713/monolithic-cobalt-doped-carbon-aerogel-for-efficient-catalytic-activation-of-peroxymonosulfate-in-water
#2
Peidong Hu, Mingce Long, Xue Bai, Cheng Wang, Caiyun Cai, Jiajun Fu, Baoxue Zhou, Yongfeng Zhou
As an emerging carbonaceous material, carbon aerogels (CAs) display a great potential in environmental cleanup. In this study, a macroscopic three-dimensional monolithic cobalt-doped carbon aerogel was developed by co-condensation of graphene oxide sheets and resorcinol-formaldehyde resin in the presence of cobalt ions, followed by lyophilization, carbonization and thermal treatment in air. Cobalt ions were introduced as a polymerization catalyst to bridge the organogel framework, and finally cobalt species were retained as both metallic cobalt and Co3O4, wrapped by graphitized carbon layers...
March 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28324712/comparison-of-gaseous-polycyclic-aromatic-hydrocarbon-metabolites-according-to-their-specificity-as-biomarkers-of-occupational-exposure-selection-of-2-hydroxyfluorene-and-2-hydroxyphenanthrene
#3
Damien Barbeau, Simon Lutier, Marie Marques, Renaud Persoons, Anne Maitre
Exposure to Polycyclic Aromatic Hydrocarbons (PAHs) occurs by respiratory, digestive and dermal absorption. Biomonitoring takes all pathways into account but sensitive and specific biomarkers are required. Different gaseous PAHs metabolites were used due to their abundance in the atmospheric mixtures but none of them were selected as better biomarker than the others. To identify the best candidates for assessing occupational airborne exposure, relation between atmospheric levels of Naphtalene, Fluorene and Phenanthrene and urinary metabolites concentrations was studied in a carbon electrode workers group...
March 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28285110/graphitic-carbon-nitride-phosphorus-rich-aluminum-phosphinates-hybrids-as-smoke-suppressants-and-flame-retardants-for-polystyrene
#4
Yongqian Shi, Bin Yu, Lijin Duan, Zhou Gui, Bibo Wang, Yuan Hu, Richard K K Yuen
Graphitic carbon nitride/organic aluminum hypophosphites (g-C3N4/OAHPi) hybrids, i.e., CPDCPAHPi and CBPODAHPi, were synthesized by esterification and salification reactions, and then incorporated into polystyrene (PS) to prepare composites through a melt blending method. Structure and morphology characterizations demonstrated the successful synthesis of PDCPAHPi, BPODAHPi and their hybrids. The g-C3N4 protected OAHPi from external heat and thus improved the thermal stability of OAHPi. Combining g-C3N4 with OAHPi contributed to reduction in peak of heat release rate, total heat release and smoke production rate of PS matrix...
March 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28285107/selective-removal-of-heavy-metal-ions-by-disulfide-linked-polymer-networks
#5
Dongah Ko, Joo Sung Lee, Hasmukh A Patel, Mogens H Jakobsen, Yuhoon Hwang, Cafer T Yavuz, Hans Chr Bruun Hansen, Henrik R Andersen
Heavy metal contaminated surface water is one of the oldest pollution problems, which is critical to ecosystems and human health. We devised disulfide linked polymer networks and employed as a sorbent for removing heavy metal ions from contaminated water. Although the polymer network material has a moderate surface area, it demonstrated cadmium removal efficiency equivalent to highly porous activated carbon while it showed 16 times faster sorption kinetics compared to activated carbon, owing to the high affinity of cadmium towards disulfide and thiol functionality in the polymer network...
March 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28285105/tunable-preparation-of-ruthenium-nanoparticles-with-superior-size-dependent-catalytic-hydrogenation-properties
#6
Yuan Zhao, Yaodong Luo, Xuan Yang, Yaxin Yang, Qijun Song
Ruthenium (Ru) featured with an unusual catalytic behavior is of great significance in several heterogeneous and electro-catalytic reactions. The preparation of tractable Ru nanocatalysts and the building of highly active catalytic system at ambient temperature remains a grand challenge. Herein, a facile strategy is developed for the controllable preparation of Ru nanoparticles (NPs) with the sizes ranging from 2.6 to 51.5nm. Ru NPs show superior size-dependent catalytic performance with the best kinetic rate constant as high as -1...
March 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28285104/eco-friendly-membrane-process-and-product-development-for-complete-elimination-of-chromium-toxicity-in-wastewater
#7
Jyothi M S, Vignesh Nayak, Mahesh Padaki, R Geetha Balakrishna, Khantong Soontarapa
Hydrophobic polysulphone (PSf) was reformed into a hydrophilic polymer by sulphonation (via electrophilic substitution) and was subsequently made into a composite by incorporating nano titania to reduce Cr (VI) in the concentrated feed to Cr (III), thus eliminating the hazards of Cr (VI). The modified polymer and its composites were characterized by spectroscopic and microscopic techniques. The composite membranes exhibited enhanced hydrophilicity and flux and were evaluated for the rejection of chromium. The effect of pH and interference of counter ions towards rejection was studied...
March 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28285103/alkaline-textile-wastewater-biotreatment-a-sulfate-reducing-granular-sludge-based-lab-scale-study
#8
Qian Zeng, Tianwei Hao, Hamish Robert Mackey, Li Wei, Gang Guo, Guanghao Chen
In this study the feasibility of treating dyeing wastewater with sulfate reducing granular sludge was explored, focusing on decolorization/degradation of azo dye (Procion Red HE-7B) and the performance of microbial consortia under alkaline conditions (pH=11). Efficiency of HE-7B degradation was influenced strongly by the chemical oxygen demand (COD) concentration which was examined in the range of 500-3000mg/L. COD removal efficiency was reduced at high COD concentration, while specific removal rate was enhanced to 17...
March 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28285111/modeling-aerobic-biotransformation-of-vinyl-chloride-by-vinyl-chloride-assimilating-bacteria-methanotrophs-and-ethenotrophs
#9
Yiwen Liu, Huu Hao Ngo, Wenshan Guo, Jing Sun, Dongbo Wang, Lai Peng, Bing-Jie Ni
Recent studies have investigated the potential of enhanced groundwater Vinyl Chloride (VC) remediation in the presence of methane and ethene through the interactions of VC-assimilating bacteria, methanotrophs and ethenotrophs. In this study, a mathematical model was developed to describe aerobic biotransformation of VC in the presence of methane and ethene for the first time. It examines the metabolism of VC by VC-assimilating bacteria as well as cometabolism of VC by both methanotrophs and ethenotrophs, using methane and ethene respectively, under aerobic conditions...
March 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28285109/stabilization-of-nanoscale-zero-valent-iron-nzvi-with-modified-biochar-for-cr-vi-removal-from-aqueous-solution
#10
Haoran Dong, Junmin Deng, Yankai Xie, Cong Zhang, Zhao Jiang, Yujun Cheng, Kunjie Hou, Guangming Zeng
Three types of modified biochar (BC) were produced respectively with acid (HCl) treatment (HCl-BC), base (KOH) treatment (KOH-BC) and oxidation (H2O2) treatment (H2O2-BC) of raw biochar. Both the raw biochar and modified biochars supported zero valent iron nanopartilces (nZVI) (i.e. nZVI@BC, nZVI@HCl-BC, nZVI@KOH-BC and nZVI@H2O2-BC) were synthesized and their capacities for Cr(VI) removal were compared. The results showed that the nZVI@HCl-BC exhibited the best performance and the underlying mechanisms were discussed...
March 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28282571/photocatalytic-degradation-of-2-4-methylphenoxy-ethanol-over-tio2-spheres
#11
Marina Ilkaeva, Igor Krivtsov, Eva Díaz, Zakariae Amghouz, Yolanda Patiño, Sergei Khainakov, José R García, Salvador Ordóñez
The photocatalytic TiO2-assisted decomposition of 2-(4-methylphenoxy)ethanol (MPET) in aqueous solution has been studied for the first time. The intermediate compounds of MPET photodegradation have been also determined. A toxic p-cresol is formed in significant quantities during the photocatalytic reaction. A solvent-exchange approach for a template-free preparation of spherical TiO2 particles has been described, which is based solely on precipitation of hydrous titania from aqueous titanium peroxo complex by using organic solvents...
March 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28279873/a-novel-route-to-utilize-waste-engine-oil-by-blending-it-with-water-and-coal
#12
Kang Zhang, Qing Cao, Li'e Jin, Ping Li, Xiaohua Zhang
Coal-oil-water slurry (COWS) synfuel can be prepared successfully by waste engine oil (WEO), water and coal in the existence of Tween 80 and SL. The effects of coal type, coal particle size distribution, and WEO blending proportion (α) on the slurryability of COWS were investigated, and certain essential properties, such as slurryability, rheology, thixotropy, and stability of COWS were examined. The results show that the maximum coal content of COWS decreases with an increment in α, ranging from 60wt.% at α=0 to 48wt...
March 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28279871/filtration-and-removal-performances-of-membrane-adsorbers
#13
Yilmaz Yurekli, Mehmet Yildirim, Levent Aydin, Melih Savran
Membrane adsorbers are promising candidates for the efficient and effective removal of heavy metals in waste water due to their unattainable adsorption and filtration capabilities. In the present study, zeolite nanoparticles incorporated polysulfone (PSf10) membrane was synthesized by means of non-solvent induced phase separation technique for the removal of lead and nickel ions in water. PSf10 showed a remarkable sorption capability and after repeated (adsorption/desorption)5 cycles in batch experiments, it preserved 77% and 92% of its initial sorption capacity for the lead and nickel, respectively...
March 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28279868/interactions-of-specific-extracellular-organic-matter-and-polyaluminum-chloride-and-their-roles-in-the-algae-polluted-water-treatment
#14
Xiaomin Tang, Huaili Zheng, Baoyu Gao, Chuanliang Zhao, Bingzhi Liu, Wei Chen, Jinsong Guo
Extracellular organic matter (EOM) is ubiquitous in the algae-polluted water and has a significant impact on the human health and drinking water treatment. We investigate the different characteristics of dissolved extracellular organic matter (dEOM) and bound extracellular organic matter (bEOM) recovered from the various growth period of Microcystis aeruginosa and the interactions of them and polyaluminum chloride (PACl). The roles of the different EOM in the algae-polluted water treatment are also discussed...
March 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28273567/transformation-and-toxicity-evaluation-of-tetracycline-in-humic-acid-solution-by-laccase-coupled-with-1-hydroxybenzotriazole
#15
Kai Sun, Qingguo Huang, Shunyao Li
Enzyme-based catalyzed oxidative coupling reactions (E-COCRs) are considered as viable technologies to transform a variety of pharmaceutical antibiotics. This study indicated that the extracellular fungal laccase from Pleurotus ostreatus was effective in transforming tetracycline (TC) with 1-hydroxybenzotriazole (HBT) present at varying conditions during E-COCRs. The presence of humic acid (HA) showed suppressive effect on the transformation rate constants (k) of TC, and the k values for TC decreased as HA concentration increased...
March 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28279870/a-method-for-simulating-the-entire-leaking-process-and-calculating-the-liquid-leakage-volume-of-a-damaged-pressurized-pipeline
#16
Guoxi He, Yongtu Liang, Yansong Li, Mengyu Wu, Liying Sun, Cheng Xie, Feng Li
The accidental leakage of long-distance pressurized oil pipelines is a major area of risk, capable of causing extensive damage to human health and environment. However, the complexity of the leaking process, with its complex boundary conditions, leads to difficulty in calculating the leakage volume. In this study, the leaking process is divided into 4 stages based on the strength of transient pressure. 3 models are established to calculate the leaking flowrate and volume. First, a negative pressure wave propagation attenuation model is applied to calculate the sizes of orifices...
February 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28279869/vapor-intrusion-risk-of-fuel-ether-oxygenates-methyl-tert-butyl-ether-mtbe-tert-amyl-methyl-ether-tame-and-ethyl-tert-butyl-ether-etbe-a-modeling-study
#17
Jie Ma, Desen Xiong, Haiyan Li, Yi Ding, Xiangcheng Xia, Yongqi Yang
Vapor intrusion of synthetic fuel additives represents a critical yet still neglected problem at sites contaminated by petroleum fuel releases. This study used an advanced numerical model to investigate the vapor intrusion potential of fuel ether oxygenates methyl tert-butyl ether (MTBE), tert-amyl methyl ether (TAME), and ethyl tert-butyl ether (ETBE). Simulated indoor air concentration of these compounds can exceed USEPA indoor air screening level for MTBE (110μg/m(3)). Our results also reveal that MTBE has much higher chance to cause vapor intrusion problems than TAME and ETBE...
February 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28273577/enhanced-sulfur-removal-by-a-tuned-composite-structure-of-cu-zn-fe-and-al-elements
#18
Waleed Mohammad Zahid, Mohamed Abdelhalim Othman, Ahmed Elhag Abasaeed
Several combinations of high sulfur affinity elements of Cu, Zn, Fe, and Al were used to prepare sorbent materials that remove hydrogen sulfide (H2S) from air contaminated streams. The combination of these four elements in composite crystallinity structure resembling hydrotalcite-like and aurichalcite-like compounds showed excellent H2S uptake. Further tuning of the relative ratio among these elements resulted in outstanding H2S uptake. XRD revealed that the final sorbent material was featured by crystallinity structure that had two adjacent lower reflection angles...
February 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28273572/assessing-the-dynamic-changes-of-rhizosphere-functionality-of-zea-mays-plants-grown-in-organochlorine-contaminated-soils
#19
Claire Blondel, Loïc Briset, Nicolas Legay, Cindy Arnoldi, Franck Poly, Jean-Christophe Clément, Muriel Raveton
The persistent organochlorine pesticides (OCPs) in soils are suspected to disturb soil biogeochemical cycles. This study addressed the dynamic changes in soil functionality under lindane and chlordecone exposures with or without maize plant. Decreases in soil ammonium concentration, potential nitrogen mineralization and microbial biomass were only OCP-influenced in bulk soils. OCPs appeared to inhibit the ammonification step. With plants, soil functionality under OCP stress was similar to controls demonstrating the plant influence to ensure the efficiency of C- and N-turnover in soils...
February 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28273570/novel-geochemistry-inspired-method-for-the-deep-removal-of-vanadium-from-molybdate-solution
#20
Jialiang Zhang, Yuping Deng, Qiuyue Zhou, Peixin Qin, Yubo Liu, Chengyan Wang
Separation of vanadium from molybdates is an essential task for processing the leaching solution of hazardous spent hydrodesulphurization (HDS) catalyst. In this study, the difference in the main naturally occurring mineral forms of Mo and V inspired us to develop a method for the deep removal of V from molybdate solution using Fe3O4 as an adsorbent. First, the adsorbent was synthesized with coprecipitation method, and then it was characterized by XRD, TEM, and VSM. The synthesized material consisted of pure Fe3O4 nanoparticles that exhibited paramagnetic property, with a saturated magnetization of 68...
February 28, 2017: Journal of Hazardous Materials
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