CHEN Qianlin, ZHONG Chunyan

(Guizhou University, Guiyang 550003）

Abstract: The GdBr₃-doped nano-TiO₂ photocatalysts were prepared by alkoxide hydrolysis. The crystal phase composition,morphologies and specific surface area of the modificated TiO₂ powder were analyzed by X -ray diffraction (XRD), transmission electron microscope (TEM) and Brunner-Emmett-Teller (BET). The results show that the GdBr₃-doped TiO₂ calcined at 550℃ for 2h in nitrogen were anatase in structure and dispersed evenly. With the conditions that the molar ratio of GdBr₃ to TiO₂ was 0.05, the exposure to visible light at the wavelength above 420nm was for 12h and the illumination intensity was 1200 μw/cm², the photocatalytic degradation of methyl orange was 70%, which indicated that photocatalytic activity of such TiO₂ powder was more active.

Keywords: TiO₂, calcination temperature, atmosphere, visible light photocatalytic activity