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Efficient degradation of 2,4-dichlorophenol in water by sequential electrocatalytic reduction and oxidation with a Pd-MWCNTs/Ni-foam electrode

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Abstract

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 (·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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Funding

National Key Research and Development Program of China (No. 2018YFD0800601) and Chongqing Natural Science Foundation of China (cstc2021jcyj-msxmX1126).

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  1. Weibin Huang and Andi Liu contributed equally to this work.

Authors and Affiliations

  1. Chongqing Key Laboratory of Agricultural Resources and Environment, College of Resources and Environment, Southwest University, Chongqing, 400715, China

    Weibin Huang, Andi Liu, Yuanhang Fu & Jinzhong Zhang

  2. Technical Center, Chongqing Customs, Chongqing Engineering Technology Research Center of Import and Export Food Safety, Chongqing, 400020, People’s Republic of China

    Bobin Tang

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  1. Weibin Huang
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Contributions

Weibin Huang: methodology, investigation, data curation, and writing — reviewing and editing. Andi Liu: conceptualization, methodology, investigation, and writing — reviewing and editing. Bobin Tang: methodology and investigation. Yuanhang Fu: methodology and investigation. Jinzhong Zhang: supervision, conceptualization, funding acquisition, and writing — reviewing and editing.

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Correspondence to Jinzhong Zhang.

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Huang, W., Liu, A., Tang, B. et al. Efficient degradation of 2,4-dichlorophenol in water by sequential electrocatalytic reduction and oxidation with a Pd-MWCNTs/Ni-foam electrode. Environ Sci Pollut Res 30, 70760–70770 (2023). https://doi.org/10.1007/s11356-023-27464-6

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