▎ 摘　　要

Singlet oxygen (O-1(2)) is an excellent active species generated in advanced oxidation processes (AOPs) that exhibits high selectivity, long life and wide pH tolerance. Therefore, catalysts for highly efficient and selective generation of O-1(2) in AOPs would be highly desirable. This study developed a single atom Co-anchored nitrogen-doped graphene (Co-SAC-NG), which showed excellent catalytic performance for peroxymonosulfate (PMS) activation and bisphenol A degradation, with the pseudofirst-order reaction rate constant improved from 8.13 x 10(-4) min(-1) without catalyst to 4.42 x 10(-2) min(-1) with 5 mg L-1 Co-SAC-NG. Mechanism studies indicated that Co-SAC-NG selectively enhanced O-1(2) generation, which was the dominant active specie for pollutant degradation. Moreover, the Co-SAC-NG/PMS system effectively reduced the acute toxicity of pollutant, and Co-SAC-NG exhibited remarkable cycling stability and negligible leaching. This study develops a new catalyst with high selectivity for O-1(2) generation and provides a reference for application of single atom catalyst in PMS-based AOPs.