Abstract:

The Fe-doped TiO2 films were prepared by sol-gel method and characterized by X-ray photoelectron spectroscopy(XPS), X-ray diffraction(XRD), confocal microscope Raman spectrometer(Raman), UV-Vis absorption spectroscopy(UV-Vis) and atomic force microscopy(AFM). The photocatalytic activities of the films were evaluated by using the degradation of the methyl orange. The results showed that TiO2 in Fe/TiO2 films took an anatase structure when calcinated between 300 ℃ and 600 ℃. Increasing the calcination temperature up to 700 ℃, TiO2 transformed to rutile phase. The roughness and the grain size of Fe/TiO2 films grew gradually with the increases of the doping amount of Fe content and the calcination temperature. The photon excited wavelength of the Fe/TiO2 films moved to the visible light gradually with the increase of number of coating layer. Low levels of Fe-doping improved the photocatalytic activities of the TiO2 thin films, while higher doping decreased the photocatalytic activities of TiO2 thin films. The optimal Fe-doping was found to be 0.1% for the maximum degradation of methyl orange.

Key words: Fe doped TiO2 films, Photocatalytic degradation, Reaction Mechnism, Methyl orange