Příprava a vlastnosti grafitického nitridu uhlíku dopovaného draslíkem

Abstract

This bachelor thesis investigated the potassium doped photocatalyst g-C3N4 and the change in the value of the band gap and the change in photocatalytic activity were observed. The theoretical part focuses on semiconductor nanomaterials with photocatalytic activity from a broad and general perspective. The nanomaterials and their types as well as different preparation methods (sol-gel, precipitation reaction, etc.) are defined. Furthermore, the instrumental methods by which the materials were investigated and analyzed are described. At the same time, photocatalytic processes are described and explained from a physicochemical point of view. In the experimental part, the preparation of g-C3N4 samples with potassium is described. Then the results of the sample analyses are evaluated. The following methods were used for the analysis: diffuse UV-VIS spectroscopy, electron microscopy, specific surface area measurement by BET method, X-ray diffraction analysis, photoluminescence and X-ray fluorescence spectroscopy. Finally, the photocatalytic activity measurement of the samples is then described and evaluated.