Perfluorooctanoic acid (PFOA) has been extensively studied as a persistent organic pollutant due to its persistence, immunotoxicity, and bioaccumulation. In this research, Fe/Ni foam electrodes were used to remove PFOA from simulated and practical factory wastewater using the electrocoagulation (EC) technique. To improve degradation, NaClO was added to the EC system to complete the “preadsorption–degradation” reaction system (EC-NaClO). The removal of 100 mg L⁻¹ PFOA (100 mL) reached 95.4% and defluorination was 68.5%. Although ClO˙, ˙OH, Cl˙, and electron transfer cannot directly attack PFOA molecules in this process, they do play important roles in reactions with the intermediate products. Based on the investigation of various driving forces, a PFOA adsorption mechanism on Fe flocs was proposed. The PFOA degradation mechanism was concluded based on the results of the quenching experiments and the contributions of various reactive species. According to the intermediates tested by HPLC-MS, two possible PFOA degradation pathways were proposed, and the results showed that PFOA was decomposed by losing –CF₂– or –COO– units stepwise. The EC-NaClO process with the Fe/Ni foam electrode demonstrated efficient “preadsorption–degradation” and improved recyclability, implying that the EC-NaClO technique has high potential for efficient and complete removal of PFOA from industrial PFOA-containing wastewater.

中文翻译：

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使用 Fe/Ni 泡沫电极的 NaClO 辅助电凝聚技术对水中 PFOA 进行有效的预吸附降解

全氟辛酸 (PFOA) 因其持久性、免疫毒性和生物累积性而被广泛研究为一种持久性有机污染物。在这项研究中，使用 Fe/Ni 泡沫电极通过电凝聚 (EC) 技术从模拟和实际工厂废水中去除 PFOA。为了改善降解，将NaClO添加到EC系统中以完成“预吸附-降解”反应系统（EC-NaClO）。去除 100 mg L ^-1PFOA (100 mL) 达到 95.4%，脱氟率为 68.5%。虽然ClO˙、˙OH、Cl˙和电子转移在此过程中不能直接攻击PFOA分子，但它们在与中间产物的反应中确实发挥了重要作用。在研究各种驱动力的基础上，提出了 PFOA 对 Fe 絮凝物的吸附机理。基于淬火实验的结果和各种活性物质的贡献，得出了 PFOA 降解机制。根据 HPLC-MS 检测的中间体，提出了 2 种可能的 PFOA 降解途径，结果表明 PFOA 通过失去-CF _{2被分解。}– 或 –COO– 单位逐步进行。使用 Fe/Ni 泡沫电极的 EC-NaClO 工艺表现出高效的“预吸附 - 降解”和改善的可回收性，这意味着 EC-NaClO 技术具有从工业 PFOA 废水中有效和完全去除 PFOA 的巨大潜力。