Single-atom iron catalysts for peroxymonosulfate-based advanced oxidation processes:Coordination structure versus reactive species
Heterogeneous peroxymonosulfate(PMS)-based oxidation technology for water treatment requires innovative catalysts for efficient and selective production of desired reactive oxygen species(ROS),such as free radicals,singlet oxygen,catalyst-PMS*complexes,and high-valent metal-oxo species.Single-atom catalysts are featured with the maximized atom utilization as well as uniform and well-defined active sites,holding a great promise for effective and selective PMS activation.Howev-er,the structure-activity/selectivity relationships have not yet been well revealed owing to multiple ROS generation pathways and their complex interplay.Herein,we focus on the mechanisms of PMS activation by single-atom iron catalysts and identify the relationships of the geometric and elec-tronic structures of single atom Fe centers to selective production of different reactive spe-cies/pathways.Moreover,in situ/operando techniques to monitor the dynamic evolution of active sites under practical working conditions and design of binuclear metal sites for synergistic catalysis will also be discussed.
Peroxymonosulfate activationSingle-atom iron catalystRadicalNonradicalWater treatmentEnvironmental remediation
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