Studies On Preparation Of Doping TiO₂ And Its Photocatalytic Properties

Pure and Gd³⁺-doped TiO₂ nanoparticle photocatalysts were prepared by sol-gel and sol-gel impregnation method, and characterized by means of X-ray diffraction, electrochemistry, PL and UV-Vis absorption spectra. The effects of Gd³⁺ doping content and calcinated temperature on the photocatalytic activity for hydrogen generation of photocatalysts under ultraviolet light irradiation were investigated. The results show that the activity of photocatalysts prepared by sol-gel impregnation method was higher than that by sol-gel method, the optimal Gd³⁺ doping content and calcinated temperature of photocatalysts were 0.5 wt % and 500℃, respectively. The phase transfer from anatase to rutile and the grain growth of TiO₂ were inhibited by doping Gd³⁺, the absorption intensity and the separation of photo-generated electrons and holes of Gd³⁺ doped TiO₂ were promoted compared with pure TiO₂ so that the activity of hydrogen generation from water was increased.The S-doped TiO₂ (S/TiO₂) nanoparticle photocatalysts were prepared by simple calcination method, and characterized by means of X-ray diffraction, XPS and UV-Vis absorption spectra. The XPS proved the valence state of doping S in S/TiO₂ was +6 and substituted for some of the lattice Ti⁴⁺.The phase transfer from anatase to rutile and the growth...