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PVDF ‐Pyrolyzed Fluorine‐Doped TiO 2 for Synergistic Adsorption‐Enhanced PFOA Photocatalysis
Summary
Fluorine-doped TiO2 synthesized via one-step PVDF pyrolysis achieved 92% PFOA removal versus 58% for pristine TiO2, with nine-fold faster kinetics and confirmed defluorination, by synergizing adsorption and photocatalysis without noble metals or graphene. This cost-effective approach addresses a critical gap in treating PFAS-contaminated water at low concentrations, where conventional methods fail.
ABSTRACT Per‐ and polyfluoroalkyl substances (PFAS), notably perfluorooctanoic acid (PFOA), are persistent pollutants posing health risks via bioaccumulation and water mobility. While TiO 2 photocatalysis for PFOA degradation is well‐reported, efficiency falters in dilute environments due to weak adsorption and rapid charge recombination. This study presents a novel hybrid approach with surface‐modified TiO 2 designed to enhance PFOA adsorption while enabling simultaneous degradation. Fluorine‐doped TiO 2 (F‐TiO 2 ) was synthesized through cost‐effective, one‐step PVDF pyrolysis, promoting nanopores and hydrophobic interactions for PFOA enrichment alongside improved charge separation. UV–vis spectroscopy and UVC tests (254 nm, 1.59 mW/cm 2 ) with sodium persulfate showed F‐TiO 2 achieving ~92% PFOA removal at 700 mg/L (vs. ~58% for pristine TiO 2 ), with nine‐fold faster kinetics (rate constant: 0.217 h −1 vs. 0.024 h −1 ; half‐life: ~3.2 h vs. ~28 h). IC analysis confirmed partial PFOA mineralization, with ~25 ppm F − detected after 16 h UV irradiation, indicating significant defluorination. Unlike noble‐metal or graphene variants, F‐TiO 2 exploits fluorine for adsorption‐photocatalysis synergy, providing an economical, scalable PFAS remediation in low‐concentration waters. image