In this work, the degradation kinetics and mechanism of diclofenac (DCF) using peracetic acid (PAA) activated by zero valent copper (ZVC) were systematically investigated. It was found that PAA could be catalyzed effectively by ZVC to produce HO^•, CH₃COO^• and CH₃COOO^•, which were responsible for the removal of DCF. Based on the XPS, XRD and FESEM characterization results of ZVC before and after reaction, the corrosion of ZVC was occurred to produce Cu⁺ under acidic condition, which was the main activator for PAA, H₂O₂ and O₂. The recommended pH for this reaction system was 3.0, and DCF degradation was enhanced gradually with increasing ZVC dose and PAA dose. The existence of Cl^-, CO₃^2–, Fe³⁺, Cu²⁺ and dissolved organic matter (DOM) promoted DCF degradation in ZVC/PAA system, while SO₄^2- and NO₃^– had almost no influence on DCF removal. Six intermediates were identified in this system, and the probable degradation mechanism of DCF was thus proposed, including seven transformation pathways, i.e., hydroxylation, amidation, dechlorination-cyclizaiton, dechlorination-hydrogenation, dechlorination-hydroxylation, decarboxylation and formylation. This study provides a new method for PAA activation and DCF removal from the polluted water.

在这项工作中，系统研究了使用由零价铜 (ZVC) 活化的过乙酸 (PAA) 降解双氯芬酸 (DCF) 的动力学和机制。结果表明，ZVC 可以有效地催化 PAA 产生 HO ^•、CH ₃ COO ^•和 CH ₃ COOO ^•，这些物质负责去除 DCF。基于ZVC反应前后的XPS、XRD和FESEM表征结果，ZVC在酸性条件下发生腐蚀，生成Cu ⁺，Cu ⁺是PAA、H ₂ O ₂和O ₂的主要活化剂. 该反应体系的推荐pH值为3.0，随着ZVC剂量和PAA剂量的增加，DCF降解逐渐增强。Cl ^-、CO ₃ ^2-、Fe ³⁺、Cu ²⁺和溶解有机物（DOM）的存在促进了ZVC/PAA体系中DCF的降解，而SO ₄ ^2-和NO ₃ ^-对 DCF 去除几乎没有影响。该体系中鉴定出6个中间体，提出了DCF可能的降解机理，包括羟基化、酰胺化、脱氯-环化、脱氯-加氢、脱氯-羟基化、脱羧和甲酰化7种转化途径。该研究为从污水中活化PAA和去除DCF提供了一种新方法。