Preparation of Doped Porous Titania from Industrial Titanyl Sulfate and its Catalytic Activities

Doped porous titania with anatase phase was prepared via thermal hydrolysis of industrial titanyl sulfate solution as titanium source,by adjusting the index of the titanium solution and the volume ratio of titanium solution to water.The as-prepared samples were characterized by XRD,particle size distribution,nitrogen absorption-desorption method and XRF determinations.Different volume ratio of titanium solution to water has great effects on the crystal structure,particle size,specific surface area and pore structure of the porous titania.Improving of crystallite of anantase phase,increase of specific surface area and impure ion dopant can all promote the photocatalytic activity of porous titania.At the volume ratio of titanium solution to water of 100:35,the porous titania was prepared with the biggest specific surface area,the S_BET of 215.4 m²/g,which had a narrow pore size distribution and doped with a small amount of oxides.And it showed high photocatalytic activity on degradation of methylene blue,with degradation rate of 92.8%.