Photocatalytic degradation of PFOAŽener, Boštjan (Avtor) Jamil, Qasim (Avtor) Matoh, Lev (Avtor) Šuligoj, Andraž (Avtor) Kraševec, Ida (Avtor) Papac Zjačić, Josipa (Avtor) Romac, Sandra (Avtor) Kušić, Hrvoje (Avtor) Novak Tušar, Nataša (Avtor) Lavrenčič Štangar, Urška (Avtor) PFOAphotocatalysisdefluorinationToxicityshorter-chain intermediatesPer- and polyfluoroalkyl substances (PFAS) comprise a large group of over 12,000 synthetic fluorinated compounds that have been widely used since the 1950s. Due to their extensive use and the exceptional strength of the C−F bonds, these compounds have begun to accumulate in the environment and resist conventional degradation processes. In this study, we examine the chemical-free photocatalytic degradation and defluorination of perfluorooctanoic acid (PFOA) at two initial concentrations (40 and 100 mg/L) using platinum-modified and non-metal doped titanium dioxide (Pt−TiO$_2$) under UV-A irradiation at 365 nm. The effects of various parameters (Pt modification, light intensity, and initial PFOA concentration) on photocatalytic efficiency were evaluated. The photocatalysts were extensively characterised, including their structural, morphological, surface-chemical, thermal, and optical properties. LC-MS/MS analysis confirmed the transformation of PFOA molecules by progressive chain-shortening. Although released fluoride ions may contribute to increased toxicity, the toxicity tests showed reduced overall toxicity during treatment, suggesting potential environmental relevance. The synthesized Pt−TiO$_2$ exhibited higher photocatalytic activity under UV-A irradiation than commercial P25, achieving up to 99 % PFOA removal and 50 % defluorination after 48 hours, although parent compound concentrations decreased below the analytical detection or quantification limit within 24 hours in selected experiments. Calcination of the catalyst removed the adsorbed fluoride species from its surface and restored its activity during reuse.20262026-09-24 13:41:30Članek v reviji188614sl