Abstract:

In this study, we try to gain nanometer photocatalyst with better photocatalytic activity and wider range of photoresponse, and apply it to nanometer TiO2-BASED composite coating that have the functions of photocatalytic self-cleaning and atmosphere purification. Nanometer solid acid SO42-/TiO2 was prepared with different methodologies and was co-doped with silver and ferrum to form nanometer SO42-/TiO2-(Ag，Fe).The products were characterized by photocatalytic activities、XRD、FT-IR and DRS. The results showed that the nanometer SO42-/TiO2 particles prepared by supercritical CO2 drying had better photocatalytic activity、superacid properties and more efficient photo-quantum effect. (Ag,Fe)co-doped SO42-/TiO2 brought about cooperativity effect, extending the light absorption width into visible spectrum.