Floating TiO2/EP photocatalyst was prepared by Sol-Gel method using tetrabutyl titanate(TBT) as precursor and expanded perlite as support. The research results showed that the Ti(OCH(CH3)2)4 can be used as precursor to prepare highly dispersed TiO2 on the perlite surface, and the mixture crystals of TiO2 (anatase and rutile) were concurrent after calcined at 550℃. The obtained results of the photocatalytic treatment experiments of water synthetically polluted with Rhodamine B showed a fairly good performanc...