Preparation and Properties of Mesoporous TiO₂ Photocatalytic Materials

Nano-TiO₂ photocatalyst was prepared by sol-gel method with tetrabutyl titanate as the raw material.The phase composition,microstructure and photocatalytic properties of the obtained nano-TiO₂ samples were characterized by XRD,SEM,UV-Vis,specific surface and aperture analyzer,respectively. The results show that the nano-TiO₂ samples are composed of single anatase phase under low calcination temperatures,having a certain degree of agglomeration with size of about 20 ~60 μm. With increase of the temperature,the size of agglomerations increases.The rutile phase is formed in the samples when the calcination temperature reaches 600 ℃,with size of crystals about 6 ~12 nm which inhibite the grain growth of anatase phase.There is a large number of 4 ~6 nm mesoporous in the sample having a specific surface area of 136.872 m²·g^-1.Degradation rate of methyl orange by the nano-TiO₂ can reach above 92%.