Preparation and Photocatalytic Activity of Bi Doped TiO₂ with Visible-Light Response

Abstract

A Bi-TiO 2 composite with high photocatalytic activity was prepared using tetrabutyl titanate and bismuth nitrate as raw material by hydrothermal method. The structure was characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), X-ray energy dispersive spectroscopy(EDS), X-ray fluorescence(XRF) and UV-vis diffuse reflectance spectrophotometer(UV-vis DRS). The results show that anatase nanometer titanium dioxide was prepared, in which Bi 3+ take the place of Ti 4+ . The surface area of the sample was higher, ca.312.6m 2 •g -1 . Bi doping caused red-shift of the absorption spectrum, and the composite has better Visible-light Response. Bi-TiO 2 shows higher photocatalytic avtivity to the degradation of resorcinol than pure TiO 2 . The optimum value of Bi doped was 1.00 %. After 120 minutes illuminating under 70W Halide Lamps, degradation rate of resorcinol can get to 100%.