Research progress of photochemical technologies for PFAS degradation in water
The treatment efficiency of coagulation sedimentation,ozonation and biological degradation etc.towards perfluor and poly-fluoroalkyl substances(PFAS)are limited,however,some photochemical degradation technologies could effectively remove PFAS from water.The generation principles of reactive species in different photochemical systems and their redox interation processes between PFAS were reviewed;besides,photogenerated hole,aqueous electron,sulfate radicals,carbonate radicals,and nitrate radicals etc.dominated PFAS degradation initiation processes,generation of products and defluorination mechanism were introduced.The current major problems of photochemical degradation technologies for PFAS contaminated water treatment were analyzed,and the research priorities of the technologies were proposed from the perspective of engineering application.
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