Abstract:

Single-atom catalysts (SACs) are a new type of material that can load metal on the carrier in atomic state. They have the advantages of high atom utilization, strong catalytic activity and easy recovery, so they have attracted much attention in the catalytic degradation of organic pollution. In this work, the influencing factors of SACs were introduced, and the applications of SACs in environmental field for catalytic degradation of organic pollutants are summarized. In addition, the catalytic mechanisms of SACs of different transition metals (Fe, Co, Mn, Cu, etc.) in advanced oxidation technology based on hydrogen peroxide or persulfate are reviewed. Single-atom metal (M) generally bonds with N to form the active site M—N _x, which activates the oxidant to generate radicals or singlet oxygen, and effectively degrades organic pollutants. Finally, the research directions of SACs on the catalytic degradation of organic pollutants are the preparation of SACs of high metal loading, high stability and wide range of pH, and the design of specific catalysts for different target pollutants according to the structure-performance relationship and catalytic mechanisms of SACs.

Key words: single-atom catalysts, advanced oxidation process, degradation, organic pollutant, mechanism

摘要：

单原子催化剂（SACs）是一种将金属以原子态负载于载体上的新型材料，具有原子利用率高、催化活性强和易回收等优点，使其在催化降解有机污染物方面备受关注。本文介绍了SACs的催化影响因素，总结了SACs催化降解有机污染物在环境领域中的应用。此外，着重综述了不同过渡金属（Fe、Co、Mn、Cu等）单原子催化剂在基于双氧水或过硫酸盐的高级氧化技术中的催化机理，单原子金属（M）一般与N键合形成活性位点M—N _x，活化氧化剂生成自由基或单线态氧，高效降解有机污染物。最后，提出未来SACs在催化降解有机污染物的研究方向是合成金属负载量高、稳定性高、pH适用范围更广的SACs，以及根据SACs的结构-性能关系和催化机理，对目标污染物设计特定催化剂。

关键词: 单原子催化剂, 高级氧化, 降解, 有机污染物, 机理