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Electrochemical pretreatment of coal gasification wastewater with Bi-doped PbO2 electrode: Preparation of anode, efficiency and mechanism.
Chemosphere. 2020 Jun; 248:126021.C

Abstract

Coal gasification wastewater (CGW) contains a large amount of toxic pollutants, which seriously affects the subsequent biochemical treatment. In order to investigate the efficiency of electrocatalytic oxidation on pretreatment of CGW, lead dioxide electrodes doped with PEG and Bi were successfully prepared. Scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction were comprehensively used to characterize the lead dioxide electrode and the electrochemical performance was also tested by linear sweep voltammetry curve, cyclic voltammetry curve and AC impedance. Biodegradability and toxicity of CGW were evaluated by dehydrogenase activity and acute toxicity, respectively. Results showed that the doping of PEG and Bi significantly improved the electrochemical performance and catalytic oxidation performance of lead dioxide electrodes. The degradation rate of phenol by Sn-Sb/PbO2 (PEG + Bi) electrode were 1.57 times of that by pure lead dioxide electrode. The removal of TOC and total phenols were 53.2% and 82.7%, respectively at 120 min under 40 mA cm-2 by Sn-Sb/PbO2 (PEG + Bi) electrode. The changes of biodegradability, biological toxicity and by-products were analyzed. Furthermore, 3,5-dimethylphenol was used as characteristic pollutant to study the degradation mechanism of phenolic pollutants in electrocatalytic system. According to the intermediate products detected by GC-MS, possible degradation pathways in electrocatalytic system were proposed.

Authors+Show Affiliations

State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China.School of Environmental and Geography Sciences, Shanghai Normal University, Shanghai, 200234, China.State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China.State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China.State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China. Electronic address: czqhit@163.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32007776

Citation

Li, Jiaxin, et al. "Electrochemical Pretreatment of Coal Gasification Wastewater With Bi-doped PbO2 Electrode: Preparation of Anode, Efficiency and Mechanism." Chemosphere, vol. 248, 2020, p. 126021.
Li J, Li M, Li D, et al. Electrochemical pretreatment of coal gasification wastewater with Bi-doped PbO2 electrode: Preparation of anode, efficiency and mechanism. Chemosphere. 2020;248:126021.
Li, J., Li, M., Li, D., Wen, Q., & Chen, Z. (2020). Electrochemical pretreatment of coal gasification wastewater with Bi-doped PbO2 electrode: Preparation of anode, efficiency and mechanism. Chemosphere, 248, 126021. https://doi.org/10.1016/j.chemosphere.2020.126021
Li J, et al. Electrochemical Pretreatment of Coal Gasification Wastewater With Bi-doped PbO2 Electrode: Preparation of Anode, Efficiency and Mechanism. Chemosphere. 2020;248:126021. PubMed PMID: 32007776.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electrochemical pretreatment of coal gasification wastewater with Bi-doped PbO2 electrode: Preparation of anode, efficiency and mechanism. AU - Li,Jiaxin, AU - Li,Mo, AU - Li,Da, AU - Wen,Qinxue, AU - Chen,Zhiqiang, Y1 - 2020/01/24/ PY - 2019/11/28/received PY - 2020/01/22/revised PY - 2020/01/23/accepted PY - 2020/2/3/pubmed PY - 2020/5/10/medline PY - 2020/2/3/entrez KW - 3, 5-dimethylphenol KW - Coal gasification wastewater KW - Electrocatalytic oxidation KW - Lead dioxide electrode SP - 126021 EP - 126021 JF - Chemosphere JO - Chemosphere VL - 248 N2 - Coal gasification wastewater (CGW) contains a large amount of toxic pollutants, which seriously affects the subsequent biochemical treatment. In order to investigate the efficiency of electrocatalytic oxidation on pretreatment of CGW, lead dioxide electrodes doped with PEG and Bi were successfully prepared. Scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction were comprehensively used to characterize the lead dioxide electrode and the electrochemical performance was also tested by linear sweep voltammetry curve, cyclic voltammetry curve and AC impedance. Biodegradability and toxicity of CGW were evaluated by dehydrogenase activity and acute toxicity, respectively. Results showed that the doping of PEG and Bi significantly improved the electrochemical performance and catalytic oxidation performance of lead dioxide electrodes. The degradation rate of phenol by Sn-Sb/PbO2 (PEG + Bi) electrode were 1.57 times of that by pure lead dioxide electrode. The removal of TOC and total phenols were 53.2% and 82.7%, respectively at 120 min under 40 mA cm-2 by Sn-Sb/PbO2 (PEG + Bi) electrode. The changes of biodegradability, biological toxicity and by-products were analyzed. Furthermore, 3,5-dimethylphenol was used as characteristic pollutant to study the degradation mechanism of phenolic pollutants in electrocatalytic system. According to the intermediate products detected by GC-MS, possible degradation pathways in electrocatalytic system were proposed. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/32007776/Electrochemical_pretreatment_of_coal_gasification_wastewater_with_Bi_doped_PbO2_electrode:_Preparation_of_anode_efficiency_and_mechanism_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(20)30214-9 DB - PRIME DP - Unbound Medicine ER -