Preparation And Research Of Visible-Light-activated TiO₂ Coupled Thin Films

TiO₂ photocatalysis is a novel technology in the degradation of pollutants. This study researched the influence of the different technical conditions and synthesized TiO₂ by the sol-gel process. The TiO₂ film was formed on the glass plate using the dip-coating method and its photocatalytic properties were evaluated by the degradation of methylene blue.TiO₂ coupled photocatalyst was prepared by doping metal ions (Fe³⁺ , Cu⁺ , Cu²⁺) , metal oxides (Fe₂O₃ , Cu₂O, CuO) , rare earth (La) and non-metal (N, S). The crystal structure and optical properties of the photocatalyst were characterized by XRD , UV-Vis and FS spectra. The results showed that the Cu₂O and La doped TiO₂ improved the photocatalytic properties and had different optimum doping content. Moreover, the doping changed the temperature of the TiO₂ phase transformation, and shift the absorption edge of TiO₂ to the visual light, and made the FS intensity decreased. These changes prove the visible-light response of TiO₂ composite catalyst.On the other hand, we prepared the supported TiO₂ on active carbon and sepiolite and investigated the technics. The two adsorbents both advanced the Photocatalytic activity of TiO₂ with the analysing of the surface configuration and evaluation of the photocatalytic activity,...