Efficient degradation of 2,4-dichlorophenol in water by sequential electrocatalytic reduction and oxidation with a Pd-MWCNTs/Ni-foam electrode
文献类型: 外文期刊
作者: Huang, Weibin 1 ; Liu, Andi 1 ; Tang, Bobin 2 ; Fu, Yuanhang 1 ; Zhang, Jinzhong 1 ;
作者机构: 1.Southwest Univ, Coll Resources & Environm, Chongqing Key Lab Agr Resources & Environm, Chongqing 400715, Peoples R China
2.Chongqing Engn Technol Res Ctr Import & Export Foo, Chongqing Customs, Tech Ctr, Chongqing 400020, Peoples R China
关键词: Pd-MWCNTs; Ni-foam electrode; 2; 4-Dichlorophenol; Sequential electrocatalytic reduction and oxidation; Mineralization; Electro-Fenton oxidation; Degradation mechanism
期刊名称:ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH ( 影响因子:5.8; 五年影响因子:5.4 )
ISSN: 0944-1344
年卷期: 2023 年 30 卷 27 期
页码:
收录情况: SCI
摘要: Our previous study indicated excellent dechlorination efficiency and phenol conversion rate in the electrocatalytic reduction of 2,4-dichlorophenol (2,4-DCP) with a Pd-MWCNTs/Ni-foam electrode; it is deserved to investigate whether this electrode can efficiently degrade phenol in electro-Fenton oxidation (EFO) process and realize the effective mineralization of 2,4-DCP in aqueous solution. In this work, the sequential electrocatalytic reduction and oxidation of 2,4-DCP were studied after examining phenol degradation in the EFO process. The results showed that the removal efficiency of 0.31 mM phenol could reach 96.76% after 90-min degradation with the rate constant of 0.0367 min(-1), and hydroxy radicals (center dot OH) were the main active species in the EFO process. In the sequential electrocatalytic reduction and oxidation processes, the removal efficiencies of 2,4-DCP, phenol, and total organic carbon (TOC) reached 99.72%, 97.07%, and 61.45%, respectively. The possible degradation mechanism of 2,4-DCP was proposed through monitoring the reaction products, and the stability and reusability of the electrode were also examined. This study suggested that 2,4-DCP in wastewater can be effectively mineralized to realize its efficient degradation through the sequential electrocatalytic reduction and oxidation.
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