Research Progress on the Direct Electron Transfer Mechanism of Carbon-Based Material Activated Peroxides

Abstract:

Advanced oxidation processes （AOPs） based on peroxides such as persulfate and peracetic acid have become a research hotspot in water environment treatment in recent years， and they have high efficiency for the degradation of new pollutants such as polycyclic aromatic hydrocarbons （PAHs） in soil and groundwater environments. Meanwhile， carbon-based materials， as electron shuttles in emerging peroxide activation systems， have also attracted extensive attention due to their high specific surface area， abundant functional groups， diverse modification methods， and advantages of low cost and minimal secondary pollution in water environment remediation. Carbon-based materials readily induce non-radical pathways during the catalytic activation of peroxides， and the direct electron-transfer non-radical mechanism has received far less scholarly attention than pathways involving singlet oxygen or high-valent metal-induced oxidation. This electron-transfer process is closely related to metastable intermediates formed between carbon-based materials and peroxides. Therefore， this paper describes the direct electron transfer mechanism of activated peroxides of carbon-based materials in different dimensions based on related studies， and summarizes the possible adsorption active sites and influencing factors of this mechanism， so as to provide a theoretical foundation for research in related fields. Finally， the characterization methods of the electron transfer process （electrochemical method， chemical quenching method） are introduced， and the current problems and future development prospects of the system are proposed， hoping to provide feasible ideas and methods for the deeper research and wider application of the system.