Research Progress of Accelerating Fe(Ⅲ)Reduction in Inorganic Reductants-Enhanced Iron-Based Peroxyacetic Acid System
The iron-based peroxyacetic acid(PAA)system has recently attracted considerable attention as an advanced oxidation technology for water treatment.This system can generate multiple reactive species that are particularly efficient in treating recalcitrant organic compounds,showing great advantages in treating difficult-to-degrade organics in particular.However,the rate-limiting step of Fe(Ⅲ)/Fe(Ⅱ)cycle significantly limited the application of conventional iron-based PAA system in large-scale water treatment processes.During the reaction,Fe(Ⅱ)is oxidized to Fe(Ⅲ),but the reduced efficiency ofFe(Ⅲ)to Fe(Ⅱ)conversion slows the reaction and disrupts the system's continuity.To overcome this challenge,researchers have proposed several strategies,with one of the most promising being the introduction of electron-rich reductants to accelerate Fe(Ⅲ)reduction.Common inorganic reducing agents,such as hydroxylamine,boron,metal sulfides,and carbon-based materials,can donate electrons to Fe(Ⅲ),facilitating its reduction to Fe(Ⅱ).This creates a benign cycle that enhances the continuity of the system,improving the overall reaction efficiency of the iron-based PAA system.Additionally,it helps avoid the increase in total organic carbon in the water caused by the use of organic reducing agents.This paper offers a comprehensive analysis of the mechanisms driving the reactivity of these reductants,highlighting that their effectiveness and applicability depend on specific conditions.By elucidating the role of these reductants,this research optimizes the catalytic performance of the iron-based PAA system and provides a strong theoretical and technical foundation for its expanded application in water treatment and environmental remediation.These findings enhance system efficiency,minimize iron sludge production,and open new avenues for its broader environmental use.
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