Effect Of Heat Treating Process On Phase Transformation And Photocatalytic Activity Of Zn-Doped Nano-Titania

The undoped titanium dioxide (TiO2) and zinc-doped TiO2 gels were prepared by sol-gel method. The nano-TiO2 powders were prepared by controlling the sintering temperature. The phase compositions of the sintered samples were analysed by powder X-ray diffraction; the microstructure was analysed by high-resolution transmission electron microscope; the photocatalytic activity was analysed by photochemical reactions instrument. The combined action of Zn2+ doping and heat treatment on phase transformation and photocatalytic performance of TiO2 were analysed. The results show that, when the Zn ion doping amount is within 1-5 mol%, it promotes the conversion of anatase to rutile transition as the presence of ZnTiO3. The photocatalytic performance of TiO2 sintered at 700 degrees C is better than sintered at 400 degrees C.