The application of the integrated Fe^II/EDDS/UV/PAA (FEUP) process (EDDS = ethylenediamine-N,N’-disuccinic acid; PAA = peracetic acid) as a novel advanced oxidation process (AOP) for the degradation of a model contaminant, namely, naproxen (NAP), at neutral pH was investigated. The enhanced NAP degradation in this system at pH 7 was primarily attributable to the continuous activation of PAA via the UV-assisted Fe^II/Fe^III cycle. A four-phase conceptual process of NAP degradation was established. The instantaneous degradation stage (IDS), in which Fe^II and PAA instantaneous react within 1 s, resulted in the degradation of ∼20% of NAP. The rapid degradation stage (RDS), in which the regenerated Fe^II rapidly activates PAA to produce the hydroxyl radicals (•OH) and organic radicals including CH₃C(O)O•, CH₃C(O)OO•, CH₃OO• and •CH₃ (defined as R-C•) without being scavenged by the Fe^II/Fe^III-EDDS complexes, contributed to the degradation of ∼55% of NAP. The slow degradation stage (SDS), during which Fe^II/Fe^III-EDDS complexes started competing for radicals, and resulted in the degradation of ∼15% of NAP. The continuous degradation stage (CDS), in which hydrogen peroxide (H₂O₂) was the only oxidant because PAA was exhausted, corresponded to the degradation of another ∼10% of NAP. The effect of water matrices including Cl^-/Br^-, HCO₃^-/CO₃^2-, and humic acid (HA) was evaluated: Br^-, HCO₃^-/CO₃^2-, and HA exhibited an inhibiting effect on NAP degradation, while Cl^- showed no influence on NAP degradation in the FEUP process. A superior degradation performance was achieved under a low Fe^II dosage and neutral conditions, demonstrating the great potential of the FEUP process for practical applications.

集成的Fe ^II / EDDS / UV / PAA（FEUP）工艺（EDDS =乙二胺-N，N'-二丁二酸； PAA =过氧乙酸）作为一种新型的高级氧化工艺（AOP）用于模型降解研究了中性pH下的污染物，即萘普生（NAP）。在此系统中，pH 7时NAP降解的增强主要归因于通过UV辅助的Fe ^II / Fe ^III循环对PAA的连续活化。建立了NAP降解的四个阶段的概念过程。Fe ^II和PAA在1 s内瞬时反应的瞬时降解阶段（IDS）导致约20％的NAP降解。快速降解阶段（RDS），其中再生的Fe ^II快速活化PAA产生羟基自由基（•OH）和有机自由基，包括CH ₃ C（O）O•，CH ₃ C（O）OO•，CH ₃ OO•和•CH ₃（定义为RC•） Fe ^II / Fe ^III -EDDS络合物清除^后，导致了约55％的NAP降解。Fe ^II / Fe ^III -EDDS络合物开始竞争自由基的缓慢降解阶段（SDS），导致NAP降解约15％。连续降解阶段（CDS），其中过氧化氢（H ₂ O ₂）是唯一的氧化剂，因为PAA已耗尽，相当于另外约10％的NAP降解。水基质含Cl的效果^- /溴^-，HCO ₃ ^- / CO ₃ ^2-，和腐殖酸（HA）进行评价：溴^-，HCO ₃ ^- / CO ₃ ^2-和HA显示对NAP具有抑制作用降解，而氯^-显示在FEUP进程NAP降解没有影响。在低Fe ^II剂量和中性条件下获得了优异的降解性能，证明了FEUP工艺在实际应用中的巨大潜力。