In this thesis, I examined the immobilization of doped TiO$_2$ on different supports and evaluated its efficiency in degrading selected pharmaceutical compounds and PFOA in water. The main goal was to prepare stable catalyst layers that perform well in aqueous environments and can be reused multiple times. The most suitable support proved to be rough PET plastic, as the catalyst formed uniform and stable layers on its surface, which was also confirmed by FTIR analysis. Glass performed less effectively, mainly due to the weaker adhesion of the catalyst. In the degradation experiments, more hydrophobic pharmaceuticals showed better degradation, while sulfamethoxazole and phenytoin remained almost unchanged. For PFOA, I first observed adsorption onto the PET surface, followed by slow photocatalytic degradation. Although complete degradation was not achieved, the results show clear potential for further improvement.
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