The Study Of Nano TiO₂ ,ZrO₂ Surface Phase Transformation Control And Photo Catalysis Application

The crystalline phase especially the surface phase of TiO2 is important for many catalytic especially for photocatalytic reactions. Therefore, establishing the relationship between the surface phase of TiO2 and its property of photocatalysis degradation organic, controlling of the crystalline phase and the process of phase transformation of TiO2 are magnificant and has been a challenging subject. Combined with UV Raman spectroscopy, UV-Vis spectroscopy, visible Raman spectro-scopy XRD and TEM, we investigated the mechanism of phase transformation especially the surface region of Nd3+,Gd3+ ions doped TiO2,ZrO2, and further tried to found a kind of mathod for man-made controlled the surface phase of multi-phase metal oxides. Moreover, it can also as the model applied in the production, provide a low cost, high value technolgy for the catalyst material research and development to to purposed.UV Raman spectroscopy is a surface-sensitive method for TiO2 because TiO2 strongly absorbs UV lights, while visible Raman spectroscopy and XRD give the information mainly from the bulk of TiO2. Based on the well characterized surface phase of TiO2 calcined at different temperature by UV Raman spectroscopy, a direct correlation has been proposed between the surface phase of TiO2 and its activity of photodegradation Rhodamin B(RhB). It is found that the pesence the surface phase important for the photocatalytic performance of TiO2 and the photoactivity is sensitive to the surface phase of TiO2.Besides, it is also researched that the phase transformation of the Nd3+,Gd3+ as the doping ions doped TiO2 sample. The result showed that the effect of either Nd2O3 or Gd2O3 on the stabilization of anatase TiO2 and when the coprecipitation and impregnation method are used. For the doped TiO2 sample, dopant such as Nd3+, Gd3+ ions can promote the phase transformation of TiO2 when the sample is prepared by the coprecipition method, while the anatase phase can be stabilized by the addition of dopant when the impregnation method with anatase support is uesd. Futhermore, it can be seen that the lower content ions doped TiO2 calcined at the higher temperature was still keep the high photoactivity.In addition, the experimental of Nd3+ ion doped ZrO2 have obtained the same results, which could provided a simple and more flexible regulation method for the multi-phase metal oxides phase stabilized of high temperature, and could widely used in the production.