Unveiling electron transfer and radical transformation pathways in coupled electrocatalysis and persulfate oxidation reactions for complex pollutant removal.

Autor: Li S; School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China., Jiang X; School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China., Xu W; School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China. Electronic address: weichengxu@fosu.edu.cn., Li M; School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, PR China., Liu Z; Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China. Electronic address: kezliu@ust.hk., Han W; Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China., Yu C; School of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, PR China., Li J; School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China., Wang H; School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China., Yeung KL; Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China; Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2024 Sep 20; Vol. 267, pp. 122456. Date of Electronic Publication: 2024 Sep 20.
DOI: 10.1016/j.watres.2024.122456
Abstrakt: The degradation of multiple organic pollutants in wastewater via advanced oxidation processes might involve different radicals, of which the types and concentrations vary upon interacting with different pollutants. In this study, electrochemical activation of peroxymonosulfate (E/PMS) using advanced activated carbon cloth (ACC) as electrode was applied for simultaneous degradation of mixed pollutants, e.g., metronidazole (MNZ) and p-chloroaniline (PCA). 92.5 % of MNZ and 91.4 % of PCA can be degraded at the cathode and anode at a low current density and PMS concentration, respectively. The rate constants for the simultaneous removal of MNZ and PCA in the E/PMS/MNZ(PCA) system were 118 times and 6 times higher than those in the sole PMS system, and 2.5 times and 1.6 times higher than those in the E/Na 2 SO 4 /MNZ(PCA) system, respectively. Different electrochemical characteristics, EPR spectra and radical quenching tests verified that the degradation of MNZ and PCA in the optimal system proceeded primarily through non-radical-dominated oxidation, involving electron transfer and 1 O 2 effect. The system also exhibited low energy consumption (0.215 kWh/m -3 ·order -1 ), broad operational pH range, excellent removal efficiency for water matrix, and low by-products toxicity, indicating its strong potential for practical applications. The ACC, with its super stable, low cost, and electrochemical activity, make it as a promising materials applicable in the E/PMS system for degradation of multiple pollutants. The study further elucidated the mechanism of pollutant interaction with electrode materials in terms of radical and non-radical transformation, providing fundamental insight into the application of this system for treatment of complex wastewater.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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