Abstract：The nano-sized TiO₂-diatomite composites was prepared by hydrolysis precipitation method using TiOSO₄ as titanium source and ammonia as precipitator. The prepared composites was characterized by XRD, SEM and N2 adsorptiondesorption. The photocatalytic performances of nano-sized TiO2-diatomite composites, pure TiO₂ and P25 were compared by the degradations of Rhodamine B. The adsorption and photocatalytic performances of the composites for Rhodamine B, Congo red, methyl orange and methylene blue were studied. The results show that the photocatalytic performance of nano-sized TiO₂-diatomite composites is obviously better than pure TiO₂ and P25 by using Rhodamine B as the targeted pollutant. The nano-sized TiO₂-diatomite composite shows different adsorption and photocatalytic activity for different dye pollutants. The prepared composites shows best adsorption and photocatalytic performance for degrading cationic methylene blue, and the worst performance for anionic methyl orange.

Keywords: nano-sized TiO₂; diatomite; dye; photocatalysis

中图分类号：TD985             文献标志码：A