Preparation Of Gd～(3+)-Doped TiO₂ Nanoparticles Photocatalyst And Study Of Photocatalytic Activity

Nano–semiconductor photocatalysis, as a promising advanced oxidization technology, has attracted much attention in the scientific research due to its special properties. Titanium dioxide nanocrystallites have widely investigated. Main of photocatlyst research is to improve photocatalyst activity and the efficiency of photocatalysts. The methods, for example, ions–doped, surface modification and oxide–composition are applied to modify the activity and the stability of TiO₂ photocatalyst.On the basis of preparing method of pure TiO₂ nanoparticles, Gd3+-doped TiO₂ nanoparticles photocatalyst is prepared. The emphasis is the study of the surface topography, structure and catalytic activity of the catalysts. The major research includes the following aspects:1. TiO₂ nanoparticles were prepared from Ti(OC4H9)4, following sol–gel method. The sample showed small particle size, good properties and had good ultraviolet adsorption. Band–edge of adsorption appeared obviously blue–shift. Quantum effect was displayed.2. A series of nano TiO₂ photocatalysts with different Gd3+-doped content were prepared with the method mentioned above. The influence of Gd3+-doped content on nano TiO₂ photocatalysts was characterized by IR,TEM,XRD and UV-Vis.3. To characterize photocatalyst activity of Gd3+-doped nano TiO₂, reactive brilliant red dye X-3B,methyl orange and rhoda mine B were selected to be degradative compounds and the degradation efficiency was researched under ultraviolet radiation. The results indicated that the degradation efficiency improved with the increase of Gd3+-doped when the mass percent of Gd3+-doped was lower than 1.0% and the degradation efficiency reduced with the increase of Gd3+-doped when the mass percent of Gd3+-doped was higher than 1.0%.