Advanced oxidation processes (AOPs) based on persulfate (PS) has attracted great attention due to its high efficiency for degradation of organic pollutants. Manganese-based materials have been considered as the desirable catalysts for in-situ chemical oxidation since they are abundant in the earth's crust and environment-friendly. In this study, manganese oxyhydroxide (MnOOH) was used as an activator for PS to degrade p-chloroaniline (PCA) from wastewater. The effects of MnOOH dosage, PS dosage and initial pH on PCA degradation performance were studied. Experimental results showed that PCA degradation efficiency was enhanced by higher MnOOH and PS addition, and the degradation efficiency was slightly inhibited as the initial pH increased from 3 to 9. MnOOH showed excellent stability and reusability when used as the activator of PS. In addition, a comprehensive study was conducted to determine the PS activation mechanism. The results revealed that PS activation by MnOOH followed a nonradical mechanism. No ¹O₂ was generated, and the main active substance in the reaction was the activated PS molecule on the surface of MnOOH. The hydroxyl group on the catalyst surface acted as a bridge connecting PS and the catalyst, leading to the activation of PS. The intermediates during PCA degradation were also analyzed, and three possible degradation pathways of PCA were proposed. This study expects to deepen the understanding of the PS activation mechanism by manganese oxide, and provides technical support for the practical application of AOPs of manganese-based materials for wastewater treatment.

基于过硫酸盐（PS）的先进氧化工艺（AOP）由于其降解有机污染物的高效率而备受关注。锰基材料被认为是进行原位化学氧化的理想催化剂，因为它们在地壳中含量丰富并且对环境友好。在这项研究中，羟基氧化锰（MnOOH）被用作PS的活化剂，以降解废水中的对氯苯胺（PCA）。研究了MnOOH用量，PS用量和初始pH值对PCA降解性能的影响。实验结果表明，较高的MnOOH和PS添加量可提高PCA的降解效率，并且当初始pH从3增加到9时，降解效率受到轻微抑制。MnOOH在用作PS的活化剂时显示出优异的稳定性和可重复使用性。此外，进行了全面的研究以确定PS激活机制。结果表明，MnOOH激活PS遵循非自由基机制。没有生成¹ O ₂，反应中的主要活性物质是MnOOH表面的活化PS分子。催化剂表面上的羟基充当连接PS和催化剂的桥，导致PS活化。还分析了PCA降解过程中的中间体，并提出了PCA降解的三种可能途径。这项研究期望加深对锰氧化物对PS活化机理的理解，并为锰基材料AOPs在废水处理中的实际应用提供技术支持。