Research progress on reductive degradation of PFAS in water by hydrated electron
Per-and polyfluoroalkyl substances(PFAS)are a class of persistent organic pollutants(POPs)that have garnered global attention in recent years,they have strong persistence,bioaccumulation and pose significant risks to human health and the ecological environment.However,PFAS are resistant to degradation by conventional advanced oxidation technologies,This poses a challenge to existing water treatment systems.Hydrated electron(eaq-)has emerged as a potent reducing agent with a high affinity for PFAS.Several technologies,such as UV/sulfite and UV/potassium iodide,have been developed to generate hydrated electron through photo-induced reactions.These technologies effectively break the carbon-carbon(C-C)and carbon-fluorine(C-F)bonds,leading to the degradation of PFAS.This article provides an analysis and summary of the progress in research,development and technical advantages and disadvantages of various photo-generated hydrated electron reduction technologies for PFAS degradation in water.It delves into the influence of water quality parameters(e.g.,pH,dissolved oxygen,coexisting substances,temperature)and molecular structures(e.g.,carbon atom number,functional groups,heteroatoms)on the efficiency and pathways of PFAS degradation.Additionally,it discusses the major challenges and future directions for fundamental research and engineering applications in this field.The aim is to provide a technical reference for achieving efficient PFAS degradation in water.
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