Performance enhancement of electrochemical degradation of H-acid wastewater via novel membrane electrode assembly electrolyser

Xi Wang, Yuxiang Xiao, Luyang Wang, Dandan Wu, Xu Wu*, Denise Bildan, Maryam Bayati, Terence Xiaoteng Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A membrane electrode assembly (MEA) based electrolyser is designed and fabricated for H-acid wastewater treatment and harmful chemical degradation. The electrochemical O3 and H2O2 generation performance has been greatly enhanced owing to the nano PbO2 catalyst on the anode and the PTFE/C catalyst on the cathode. Since the anode oxidation (AO) combined with oxygen reduction reaction (ORR) enhances ·OH radical generation, the in situ AO-ORR coupling system shows better mineralization efficiency and lower electrochemical energy consumption for organic degradation. Additionally, the nano PbO2 anode exhibited excellent stability and maintained high degradation efficiencies after 15 times of successive reuse of the in situ AO-ORR coupling system. Based on 16 identified intermediates categorized as primary, secondary, and downstream intermediates, a possible degradation pathway of the H-acid electrochemical oxidation was proposed and the toxicity was drastically reduced after the degradation.

Original languageEnglish
Article number127394
Number of pages12
JournalSeparation and Purification Technology
Volume346
Early online date5 Apr 2024
DOIs
Publication statusE-pub ahead of print - 5 Apr 2024

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