Abstract
In this study, we present research on PFOS occurrence in surface and groundwater in Croatia. PFOS was detected and quantified at ultra-low concentrations (even ng/L) by means of LC-QTOF-MS analysis. PFOS was treated with solar photocatalysis using different reactor types, different irradiation intensities and photocatalytic formulations. Most experiments ended with only a slight change in PFOS concentrations, proving its super-resistance toward UV irradiation and oxidative species, e.g. OH radicals. In certain experiments, PFOS degradation extents were approximately 20% after 120 min of the photocatalytic process. Additionally, photocatalysis was coupled with ultrasound to increase PFOS degradation products, we discussed the tentative degradation mechanism and proposed a solution how to possibly beat its super-resistance.
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