New insights on the role of NaCl electrolyte for degradation of organic pollutants in the system of electrocatalysis coupled with advanced oxidation processes

电解质 化学 降级(电信) 污染物 氯化物 电催化剂 无机化学 环境化学 电化学 电极 有机化学 计算机科学 电信 物理化学
作者
Lei Tian,Zhu Meng,Longshuai Zhang,Lijuan Zhou,Jie‐Ping Fan,Daishe Wu,Jian‐Ping Zou
出处
期刊:Journal of environmental chemical engineering [Elsevier BV]
卷期号:10 (3): 107414-107414 被引量:24
标识
DOI:10.1016/j.jece.2022.107414
摘要

The role of sodium chloride (NaCl) in pollutant degradation in electrocatalysis coupled with advanced oxidation processes (EAOPs) system remains debatable and the formation of toxic chlorine-substituted byproducts during this process has raised growing concern. Herein, the role of NaCl electrolyte for the degradation of p-nitrophenol (4-NP) in the EAOPs (Co3O4/PMS/NaCl) system was identified. Different from the effect of mass transfer, the presence of NaCl electrolyte improved the 4-NP degradation efficiency and the degradation products were affected by the concentrations of peroxymonosulfate (0.01–8 mM) and Cl- (10–100 mM). Besides, different active species (SO4•−, HOCl, or Cl•/ClO•) with different amounts can be produced in the EAOPs systems with three typical PMS concentrations (0.01, 0.032 and 4 mM). Moreover, the formation of chlorine-substituted byproducts can be effectively avoided via adjusting the concentrations of PMS and NaCl to inhibit the formation of Cl•/ClO•. Finally, this EAOPs system was used to degrade the kimchi processing wastewater and 34% of COD and 99% of TN were removed, revealing it has a good practical application. This study illuminates a new role of NaCl as the electrolyte for the degradation of organic pollutants in the EAOPs system for the first time.
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