期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 688, 期 -, 页码 75-82出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.06.197
关键词
Benzophenone-3 and metabolite; Electrochemical degradation; Ti/SnO2-Sb/Ce-PbO2 anode; Mechanism and toxicity
资金
- National Science Fund for Distinguished Young Scholars [51625801]
- China Postdoctoral Science Foundation [2018M643671]
- Guangdong Innovation Team Project for Colleges and Universities [2016KCXTD023]
- Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme
Electrochemical degradation of sunscreen agent benzophenone-3 (BP-3) and its metabolite 4-hydroxybenzophenone (4-OH-BP) was investigated by using a Ti/SnO2-Sb/Ce-PbO2 anode. Results showed that the degradation of BP-3 and 4-OH-BP followed pseudo-first-order kinetics, and the rate constants were 0.083 and 0.113 min(-1) at a current density of 25 mA cm(-2), respectively. The electrochemical degradation of BP-3 and 4-OH-BP was efficient over a wide range of pH values, and the degradation was obviously accelerated in the presence of Cl-. Degradation intermediates were identified during the electrochemical process, and the degradation pathways, mainly including hydroxylation, carbonyl group broken from aromatic ring, benzene ring opening and carboxylation, were proposed. Quantitative structure-activity relationship model indicated that the potential risks of BP-3 and 4-OH-BP to fish, daphnia and green algae were decreased with the increase of reaction time. The energy consumption for the degradation of 90% BP-3 and 4-OH-BP was 3.3-62.1 and 3.6-79.5 Wh L-1, respectively. The results illustrate that the electrochemical technique with Ti/SnO2-Sb/Ce-PbO2 anode is expected to be an effective way for removing BP-3 and its metabolite 4-OH-BP from wastewater. (C) 2019 Elsevier B.V. All rights reserved.
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