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Yang X.-J.,East China University of Science and Technology | Yang X.-J.,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process | Xu X.-M.,East China University of Science and Technology | Xu X.-C.,East China University of Science and Technology | And 6 more authors.
Catalysis Today | Year: 2016

A heterogeneous Fenton-like catalyst was used for the oxidation of Bisphenol A (BPA), which is a typical endocrine disruptor. A simple semi-empirical kinetic equation was developed to define the effects of experimental conditions (initial concentration of H2O2, initial concentration of BPA, temperature and the catalyst loading) on the reaction rate. The plausible pathway of the degradation process was proposed. A pseudo-first-order reaction rate expression with respect to BPA concentration was developed to fit all data for these experiments, and the equation of k obs (observed rate constant) was obtained with the apparent activation energy of 42.2kJ/mol. In order to reduce the operational cost, the values of parameters (temperature, initial concentration of H2O2 and pH) that optimize the catalytic performance were studied by means of a response surface methodology. Finally, a plausible mechanism was proposed on the basis of kinetics and optimization studies, which illustrates the reaction process and optimization in a microscopic view. © 2016 Elsevier B.V. Source


Liu K.,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process | Liu K.,East China University of Science and Technology | Chen L.,Shanghai Fisheries Research Institute | Zhang W.,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process | And 4 more authors.
Ecotoxicology | Year: 2015

Lead (Pb) and decabromodiphenyl ether (BDE209) are the main contaminants at e-waste recycling sites, and their potential toxicological effects on terrestrial organisms have received extensive attention. However, the impacts on the oxidative perturbations and hydroxyl radical (·OH) generation in earthworms of exposure to the two chemicals remain almost unknown. Therefore, indoor incubation tests were performed on control and contaminated soil samples to determine the effects of Pb in earthworms Eisenia fetida in the presence of BDE209 through the use of several biomarkers in microcosms. The results have demonstrated that the addition of BDE209 (1 or 10 mg kg−1) decreased the enzymatic activities [superoxide dismutase, catalase (CAT), peroxidase] and total antioxidant capacity (T-AOC) compared with exposure to BDE209 alone (50, 250 or 500 mg kg−1). Electron paramagnetic resonance spectra indicated that ·OH radicals in earthworms were significantly induced by Pb in the presence of BDE209. The changing pattern of malondialdehyde (MDA) contents was accordant with that of ·OH intensity suggested that reactive oxygen species might lead to cellular lipid peroxidation. Furthermore, CAT exhibited more sensitive response to single Pb exposure than the other biomarkers, while T-AOC, ·OH and MDA might be three most sensitive biomarkers in earthworms after simultaneous exposure to Pb and BDE209. The results of these observations suggested that oxidative stress appeared in E. fetida, and it may play an important role in inducing the Pb and BDE209 toxicity to earthworms. © 2014, Springer Science+Business Media New York. Source


Zhang R.,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process | Zhang R.,East China University of Science and Technology | Zhang W.,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process | Zhang W.,East China University of Science and Technology | And 5 more authors.
Environmental Science and Pollution Research | Year: 2016

Lead (Pb) and decabromodiphenyl ether (BDE209) are main pollutants at electric waste (e-waste) recycling sites (EWRSs), and their joint toxicological effects have received extensive attention. Frequently, soil pollution at EWRSs usually results from the occurrence of repeated single or multiple pollution events, with continuous impacts on soil microorganisms. Therefore, a laboratory incubation study was conducted to determine Pb bioavailability and microbial toxicity in repeated Pb-polluted soil in the presence of BDE209 for the first time. We evaluated the impacts of repetitive exposure trials on chemical fractions of Pb, and the results showed that repeated single Pb pollution event resulted in an increase of carbonates fraction of Pb, which was different from one-off single Pb exposure. Moreover, one-off Pb-treated groups exhibited higher IR (reduced partition index) values on day 30 and all treatments remained the same IR level at the end of incubation period. The parameters of microbial toxicity were well reflected by soil enzymes. During the entire incubation, the dehydrogenase and urease activities were significantly inhibited by Pb (P < 0.01), and BDE209 supply could weaken the adverse influence. Additionally, significant correlations between available or metastable Pb and the two soil enzymes were clearly observed (P < 0.05 or 0.01). Such observations would provide useful information for ecological effects of Pb and BDE209 at EWRSs. © 2015, Springer-Verlag Berlin Heidelberg. Source


Zhang W.,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process | Zhang W.,East China University of Science and Technology | Liu K.,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process | Liu K.,East China University of Science and Technology | And 6 more authors.
Environmental Toxicology and Pharmacology | Year: 2014

Decabromodiphenyl ether (BDE209) is the major contaminant at e-waste recycling sites (EWRSs), and its potential toxicological effects on terrestrial organisms have received extensive attention. However, the impacts of BDE209 on the antioxidant defense system in terrestrial organisms remain vague. Therefore, indoor incubation tests were performed systematically on control and contaminated soil samples to determine the effects of BDE209 on the antioxidant system of earthworm Eisenia fetida. The results showed that compared to the controls, superoxide dismutase (SOD) activities in all treated groups were elevated significantly after 21 and 28 days exposure; catalase (CAT) activities were much higher in all tests during the entire exposure period; peroxidase (POD) and glutathione-s-transferase (GST) activities generally decreased and indicated contrary response trend; the total antioxidant capacity (T-AOC) after exposure to low level of BDE209 (1mgkg-1) was induced, whereas at 10 and 100mgkg-1 concentrations it showed suppression status; electron paramagnetic resonance (EPR) spectra suggested that hydroxyl radicals (OH) in earthworms were significantly induced by BDE209; the changes in malondialdehyde (MDA) contents suggested that reactive oxygen species (ROS) might lead to cellular lipid peroxidation in earthworms. The results of these observations suggested that severe oxidative stress occurred in E. fetida, and it may play an important role in inducing the BDE209 toxicity to earthworms. © 2014 Elsevier B.V. Source


Zhang W.,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process | Zhang W.,East China University of Science and Technology | Li L.,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process | Li L.,East China University of Science and Technology | And 9 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2012

Perchloroethylene (PCE) as a typical chlorinated hydrocarbon solvent was widely used in industry. Now the groundwater of contaminated sites is badly polluted due to improper handling of PCE, which results in a serious threat to human health and ecological security. Air stripping in sieve plate tower for the treatment of the water polluted by PCE was studied. The results are as follows: After air stripping, PCE concentration declined from 25.68 mg/L to 0.62 mg/L, and removal rate amounted to 97.59%; Gas-liquid ratio obviously affected PCE removal rate and the optimum gas-liquid ratio was around 200; Initial concentration influenced the removal effect slightly; Waste water was better treated by 4 plates column; Experimental data followed one-order decay model very well; Economic cost was about ¥0.31 per ton of waste water, and therefore air stripping as a pre-treatment process of biochemical method was desirable. Source

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