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<p>Contact electrocatalysis (CEC) is an effective method for activating peroxymonosulfate (PMS) to efficiently degrade emerging pollutants. However, the intrinsic mechanisms of PMS activation via CEC are not fully understood. In this study, we employed a CEC system based on ultrasonication (US) treatment of fluorinated ethylene propylene (FEP) to investigate both the performance of PMS activation and the underlying degradation mechanism. The results demonstrate that the ultrasonically treated FEP-PMS (US/FEP/PMS) system achieves complete degradation of bisphenol A within 60 min. The degradation rate constants in the system are 11.53 and 4.77 times higher than those observed in the US/FEP and US/PMS systems, respectively. Electrochemical and chemical analyses reveal that the enhanced degradation efficiency of the US/FEP/ PMS system stems from electron exchange at the FEP-water interface under mechanical stimulation, facilitating PMS activation to produce both radical and nonradical reactive species. In addition, the US/FEP/PMS system is effective across various water matrices, indicating its potential for real-world applications. Theoretical calculations further confirm that the CEC system can reduce the potential barrier for PMS activation. This study provides crucial insights into the enhanced degradation of organic pollutants using CEC-triggered PMS-based advanced oxidation processes.</p>

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Contact-electro-catalysis triggers peroxymonosulfate activation for micropollutant degradation

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Yue Lai,
  • Keyi Li,
  • Senpei Lin,
  • Lihua Zhou,
  • Zhen Yu,
  • Yong Yuan

摘要

Contact electrocatalysis (CEC) is an effective method for activating peroxymonosulfate (PMS) to efficiently degrade emerging pollutants. However, the intrinsic mechanisms of PMS activation via CEC are not fully understood. In this study, we employed a CEC system based on ultrasonication (US) treatment of fluorinated ethylene propylene (FEP) to investigate both the performance of PMS activation and the underlying degradation mechanism. The results demonstrate that the ultrasonically treated FEP-PMS (US/FEP/PMS) system achieves complete degradation of bisphenol A within 60 min. The degradation rate constants in the system are 11.53 and 4.77 times higher than those observed in the US/FEP and US/PMS systems, respectively. Electrochemical and chemical analyses reveal that the enhanced degradation efficiency of the US/FEP/ PMS system stems from electron exchange at the FEP-water interface under mechanical stimulation, facilitating PMS activation to produce both radical and nonradical reactive species. In addition, the US/FEP/PMS system is effective across various water matrices, indicating its potential for real-world applications. Theoretical calculations further confirm that the CEC system can reduce the potential barrier for PMS activation. This study provides crucial insights into the enhanced degradation of organic pollutants using CEC-triggered PMS-based advanced oxidation processes.