Abstract：In this paper, the nano-sized SO2-4/ TiO2 solid superacid photocatalysts have been prepared by the method of hydrothermal heating the mixed solution of Ti(SO4)2 and urea, heating-decomposing, wet impregnating-calcining. The middle products and the ultimate products have been characterized by XRD, BET, FTIR, DRS and FS. The degradation of rhodamine B by photocatalyst was regarded as a model reaction. The optimum condition of preparing SO2-4/ TiO2 photocatalysts has been chosen. The results show that hydrothermal treating the solution of Ti(SO4)2 can get the anatase nano-sized TiO2 in the weak alkalinity medium; at 300℃ by-products of hydrothermal reaction, such as (NH4)2SO4 and so on, can be decomposed by calcining for 4 hours, avoiding much loss of H2SO4; the most important factors that imfluence the photocatalystic activities of SO2-4/ TiO2 are the concentration of SO2-4 on TiO2 and the calcination time. SO2-4/ TiO2 photocatalysts have the best photocatalystic activities, up to the level of P-25 photocatalyst, when the concentration of SO2-4 on TiO2 is 11% and the calcination temperature is 450℃.
Key words：SO2-4/ TiO2;Solid superacid;Photocatalyst;Rhodamine B
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