In recent years, there has been growing interest in the mechanism (radical or nonradical) of persulfate activation processes. In this study, the enhancement of naproxen (NPX) degradation in a Cu⁰/peroxymonosulfate (PMS) system by complexing reagents was investigated. Surprisingly, neocuproine (NCP) alters the nature of reactive species in the Cu⁰/PMS system. A high-valent copper species, Cu(III)-NCP, was found to dominate NPX degradation rather than radicals under acid conditions for the first time. Moreover, systematically designed experiments revealed that the Cu(III)-NCP complex was a strong selective oxidant that reacted with organics through a single electron transfer pathway. Meanwhile, the degradation efficiency of NPX was highly dependent on the solution pH and dosage of Cu⁰ and NCP, but was irrelevant to the concentration of NPX. Additionally, the enhancement of NCP on other copper based PMS activation systems (i.e., Cu²⁺/HA/PMS and Cu⁰/HA/PMS systems) was investigated. Considering that the released copper can be removed by a simple precipitation method to meet the effluent standards, the new complex-enhanced Cu⁰/PMS system provided a new method to enhance the degradation efficiencies of pollutants by a copper-catalyzed Fenton-like system.

近年来，人们对过硫酸盐活化过程的机制（自由基或非自由基）越来越感兴趣。^{在本研究中，研究了络合试剂在 Cu 0} /过氧单硫酸盐 (PMS) 体系中对萘普生 (NPX) 降解的增强作用。令人惊讶的是，新铜嘌呤 (NCP) 改变了 Cu ⁰ /PMS 系统中活性物质的性质。首次发现高价铜物种 Cu(III)-NCP 在酸性条件下主导 NPX 降解，而不是自由基。此外，系统设计的实验表明，Cu(III)-NCP 配合物是一种强选择性氧化剂，可通过单一电子转移途径与有机物发生反应。同时，NPX的降解效率很大程度上取决于溶液的pH值和Cu的用量。⁰和 NCP，但与 NPX 的浓度无关。此外，还研究了 NCP 对其他基于铜的 PMS 活化系统（即 Cu ²⁺ /HA/PMS 和 Cu ⁰ /HA/PMS 系统）的增强作用。考虑到释放的铜可以通过简单的沉淀法去除以满足出水标准，新型复合增强Cu ⁰ /PMS系统为铜催化类Fenton系统提高污染物降解效率提供了一种新方法。