Heterogeneous sulfate radical-based advanced oxidation processes (SR-AOPs) have been widely reported over the last decade as a promising technology for pollutant removal from wastewater. In this study, a novel peroxymonosulfate (PMS) activator was obtained by visible-light-driven Mn(II) oxidation in the presence of nitrate. The photochemically synthesized manganese oxides (PC-MnO_x) were polymorphic amorphous nanoparticles and nanorods, with an average oxidation state of approximately 3.0. It possesses effective PMS activation capacity and can remove 20 mg L^-1 acid organic II (AO7) within 30 min. The AO7 removal performance of PC-MnO_x was slightly decreased in natural waterbodies and in the presence of CO₃^2-, while it showed an anti-interference capacity for Cl^-, NO₃^- and humic acid. Chemical quenching, reactive oxygen species (ROS) trapping, X-ray photoelectric spectroscopy (XPS), in-situ Raman spectroscopy, and electrochemical experiments supported a nonradical mechanism, i.e., electron transfer from AO7 to the metastable PC-MnO_x-PMS complex, which was responsible for AO7 oxidation. The PC-MnO_x-PMS system also showed substrate preferences based on their redox potentials. Moreover, PC-MnO_x could activate periodate (PI) but not peroxydisulfate (PDS) or H₂O₂. Overall, this study provides a new catalyst for PMS activation through a mild and green synthesis approach.

在过去的十年中，基于多相硫酸根的高级氧化工艺（SR-AOPs）作为一种有前途的废水去除技术被广泛报道。在这项研究中，在硝酸盐存在下，通过可见光驱动的 Mn(II) 氧化获得了一种新型过氧单硫酸盐 (PMS) 活化剂。光化学合成的锰氧化物（PC-MnO _x）是多晶型非晶纳米颗粒和纳米棒，平均氧化态约为3.0。它具有有效的 PMS 活化能力，可在 30分钟内去除 20  mg  L ^-1酸性有机物 II (AO7) 。_{PC-MnO x} 的 AO7 去除性能在天然水体和 CO ₃存在下略有下降^{2- ，同时对Cl -}、NO ₃ ^-和腐植酸显示出抗干扰能力。化学猝灭、活性氧 (ROS) 捕获、X 射线光电光谱 (XPS)、原位拉曼光谱和电化学实验支持非自由基机制，即电子从 AO7 转移到亚稳态 PC-MnO _x -PMS 复合物，它负责 AO7 的氧化。PC-MnO _x -PMS 系统还显示了基于其氧化还原电位的底物偏好。此外，PC-MnO _x可以激活高碘酸盐（PI），但不能激活过二硫酸盐（PDS）或 H ₂ O ₂. 总体而言，这项研究通过温和和绿色的合成方法为 PMS 活化提供了一种新的催化剂。