Photocatalytic Activity Of Doping Titanium Dioxide And M_xO_y@TiO₂ Hybrid Photocatalyst

In order to improve the photocatalytic activity and broaden the absorbing spectrum range of irradiation light, titanium dioxide was modified by co-modification, anion doping for photodegradation of trichloroacetic acid. And a hybrid catalyst with core-shell structure was prepared and used for photocatalysis.(1) TiO₂/AC-M, Zn-TiO₂/AC and V-Pt-TiO₂ have been prepared with sol-gel method. The catalysts were characterized by XRD, TEM, SEM, FT-IR, UV-Vis, XPS. The photodegradation of Cl₃CCOOH (TCA) show that co-modification enhances the photo-catalytic activity of titanium dioxide greatly.(2) TiO_2-xC_x and TiO_2-xN_x (TiO₂ doping with anion) were prepared and used for photodegradation. The absorption spectrum of the TiO_2-xC_x and TiO_2-xN_x show a stronger absorption in the UV-visible range and about 36 nm and 26 nm red shift of the onset of the spectrum compared with one of anatase TiO₂, respectively. The catalytic results indicate that both TiO_2-xC_x and TiO_2-xN_x shown photocatalytic activity under visible light irradiation. The photodegradation efficiency of TiO_2-xC_x has not been improved by doping Fe³⁺ ions. However, Pt nanoparticles loaded on TiO_2-xN_x enhances the photo-catalytic activity(3) Hybrid catalyst In₂O₃@TiO₂ was prepared using sol-gel method. The results show that In₂O₃@TiO₂ does not broaden the absorbing spectrum range, but it can decrease the recombination of electron and hole greatly since the carriers can move towards the core and shell, respectively.