Recent advances of sulfite-based advanced oxidation processes and their reaction mechanisms
Sulfite-based advanced oxidation processes(S(Ⅳ)-AOPs)have received increasing attention in recent years.The S(Ⅳ)activation process involves the transformation of various sulfur-containing radicals and non-radical species,which usually makes the mechanism of a S(Ⅳ)-AOP complicated and controversial.However,the existing S(Ⅳ)-AOPs and their reaction mechanisms were rarely classified and summarized in detail.Therefore,this study concluded the physicochemical properties of S(Ⅳ)and the transformation mechanism of sulfur-containing radicals,reviewed various methods for activating S(Ⅳ),systematically illustrated reaction mechanisms in S(Ⅳ)-AOPs as well as the generation and contribution of active oxidants,and analyzed factors influencing the efficacy of contaminants degradation by S(Ⅳ)-AOPs.Finally,the future advances were proposed based on the current research status and needs about SⅣ)-AOPs to lay the foundation for S(Ⅳ)-AOPs application in the control of water pollution.
advanced oxidation processessulfitereaction mechanismsfactorsthe control of water pollution
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