Fotokatalytický rozklad oxidu dusného v přítomnosti fotokatalyzátorů ve formě tenkých vrstev tvořených nanotrubičkami oxidu titaničitého

Abstract

This bachelor thesis deals with the photocatalytic decomposition of nitrous oxide in the presence of photocatalysts in the form of thin films formed by titanium dioxide nanotubes prepared by electrochemical anodization with different voltages. A photocatalyst in the form of TiO2 film was also prepared by sol-gel method to compare the photoactivity. The photocatalytic digestion was carried out in a stainless steel seeded photoreactor using a UV lamp of 365 nm wavelength in the time interval of 0-22 hours. The physicochemical properties of the photocatalysts were studied by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and ultraviolet-visible spectrometry (UV-Visible spectrometry). A gas chromatograph with a dielectric barrier ionization detector (GC/BID) was used to determine the nitrous oxide concentration. The evaluation of the experimental data revealed that the highest nitrous oxide conversion (10.8 %) was achieved in the presence of the photocatalyst F_40 after 22 h of UV lamp illumination. The morphology and specific surface of the nanotubes, which were evaluated by the choice of voltage during electrochemical anodization, played a key role.