Mesoporous TiO2 was prepared by a sol-gel method with the assistance of cetyl trimethyl ammonium bromide(CTAB).Then the activity of the photocatalyst so produced for photocatalytic decolorization of methyl orange(MO)solution was evaluated,and the photocatalyst was characterized with BET specific surface.The results indicate that with the ratio of nCTAB to nTBOT at 1: 4 and calcination temperature at 450 °C,mesoporous TiO2 can be obtained.In addition,the activity of TiO2 prepared in our experiments for photo...