Single-atom catalysts activate persulfate to degrade emerging organic contaminants in aqueous environments

Abstract

Single-atom catalysts (SACs) exhibit outstanding catalytic activity due to their highly dispersed metal centers. Activating persulfates (PS) with SACs can generate various reactive oxygen species (ROS) to efficiently degrade emerging organic contaminants (EOCs) in aqueous environments, offering unique advantages such as high reaction rates and excellent stability. This technique has been extensively researched and holds enormous potential applications. In this paper, we comprehensively elaborated on the synthesis methods of SACs and their limitations, and factors influencing the catalytic performance of SACs, including metal center characteristics, coordination environment, and types of substrates. We also analyzed practical considerations for application. Subsequently, we discussed the mechanism of SACs activating PS for EOCs degradation, encompassing adsorption processes, radical pathways, and non-radical pathways. Finally, we provide prospects and outline our vision for future research, aiming to guide advancements in applying this technique. HIGHLIGHTS Summarized the synthesis methods of single-atom catalysts and limitations.; Discussed the factors influencing the performance of single-atom catalysts and practical factors.; Elucidated the mechanism of SACs activating PS for EOCs degradation and prospects for the future.;

Keywords

• advanced oxidation processes
• catalytic mechanism
• emerging organic contaminants
• persulfate
• single-atom catalyst