Nghiên cứu các chất quang xúc tác TiO2 được biến tính bằng Fe2O3 bằng phương pháp sol-gel

Abstract

Thin layers of pure TiO₂ and TiO₂ doped by different amounts of Fe₂O₃ have been prepared by sol-gel method with tetraisopropyl orthotitanate and Fe(NO₃)₃. Physico-chemical properties of the catalysts were studied by the methods of BET Adsorption, X-ray Diffraction (XRD), FE-SEM, as well as Raman, IR and UV-Vis spectroscopies. Photocatalytic activity of the obtained materials was investigated in the reaction of complete oxidation of p-xylene in gas phase under the radiation of UV (l = 365 nm) and Blue LED (l = 470 nm) lamps. It has been found that particle’s size of all the samples is distributed in the range of 20-30 nm. The content of rutile phase in Fe-doped TiO₂ samples varied from 6.8 to 41.8% depending on the Fe content. Iron oxide doped into TiO₂ enables to move the photon absorbing zone of TiO₂ from UV toward visible wave lengths as well as to reduce its band gap energy from 3.2 eV to 2.67 eV. Photocatalytic activities of the TiO₂ samples promoted by Fe³⁺ have been found to be higher than those of pure TiO₂.