Efficient mineralization of PFAS by electric energy from multicomponent coordination on cation-π systems in waters
Yumeng Wang1, Peng Zhang1, Weixiang Liao1
1Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Institute of Environmental Research at Greater Bay, Ministry of Education, Guangzhou University, Guangzhou 510006, China.
Abstract:
Removing per- and polyfluoroalkyl substances (PFAS) in water resources at trace concentrations (ng/L) is scientifically challenging. Herein, a cation-π system was constructed comprising a Fe(II)/Fe(III) coordinated graphene-like structure encapsulating Fe° catalyst (Fe(II)/Fe(III)-GL@Fe0), realizing rapid PFAS mineralization in municipal wastewater and raw drinking water under ambient atmospheric conditions without external energy input. The strong electric field was generated from DOC-PFAS-H2O-O2 synergistic coordination at Fe species area and GL area on Fe(II)/Fe(III)-GL@Fe0 via surface charge rearrangement by Fe-π interaction, triggering surface electrochemical-like redox reactions: sequential adsorbed C-F bond oxidation, adjacent bond homolysis, and O2 reduction until complete PFAS mineralization. Our findings highlight the potential of electric energy generation from multicomponent coordination on Fe-modified GL-based catalyst in developing cost-effective novel technologies for PFAS micropollutant purification in real water.
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