Publication date: 22nd July 2026
Per- and polyfluoroalkyl substances (PFAS) are a class of highly persistent environmental contaminants that have attracted significant attention due to their widespread occurrence, bioaccumulation potential, and resistance to conventional degradation methods. Their exceptional chemical stability, primarily attributed to the strength of carbon–fluorine (C–F) bonds, makes their removal and complete destruction from environmental systems particularly challenging. In this study, light-responsive photocatalytic systems based on titanium dioxide (TiO₂) and palladium (Pd) deposited onto glass filter substrates were developed and investigated for their ability to promote the defluorination of perfluorooctanoic acid (PFOA) under UV irradiation conditions [1,2].
The photocatalytic materials were fabricated using physical vapor deposition techniques, enabling the controlled incorporation of active catalytic components onto the glass filter surface. Their performance toward PFOA degradation was evaluated by monitoring the cleavage of C–F bonds and the subsequent release of fluoride species. Nuclear magnetic resonance (NMR) spectroscopy was employed to investigate the structural transformation of PFOA and confirm the occurrence of defluorination processes. In addition, X-ray diffraction (XRD) analysis was used to verify fluoride removal pathways by identifying the formation of calcium fluoride (CaF₂), demonstrating that released fluoride ions (F⁻) were effectively captured during the reaction.
The findings provide valuable insights into the design of photocatalytic materials capable of activating and transforming highly stable fluorinated compounds. This work contributes to the advancement of light-controlled catalytic systems and sustainable approaches for the degradation and remediation of persistent chemical pollutants, supporting the development of next-generation technologies for PFAS management and environmental protection.
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