Preparation and Characterization of Transition Metal Doped TiO2 Photocatalysts.

초록

Transition metal doped TiO2 powder as a photocatalyst were prepared by sol - gel process using titanium isopropoxide as a Ti precursor. Sb, Bi and Nb were introduced as a dopants, and the photocatalytic behaviors for the prepared TiO2 powder were studied as a function of doping level and preparation conditions. Optical properties of the doped TiO2 powders were studied by UV - Visible - spectrometer. X-ray diffraction and scanning electron microscopy were applied for microstructural studies. Photocatalytic activity of each doped TiO2 was characterized in terms of the degradation of a dichlorobenzene. XRD analysis indicated that the doping of transition metal suppress the phase transition of TIO2 from anatase to rutile. The samaple heat - treated at 500('C) exhibited anatase phase, while anatase phase were remained in the samples heat - treated over 700('C). The UV - visible absorption spectra of doped samples were red - shifted by 20 - 50 nm according to doping level. Some of doped TiO2 exhibited improved photocatalytic activity.