Photo-catalytic properties of TiO₂ supported layered compounds for dye removal

TiO₂-supported K₂Ti₆O₁₃ with different loadings was prepared by impregnation of KOH on TiO₂ surface and calcination at 1073 K. UV-DRS results revealed that the band gap of K₂Ti₆O₁₃ layered compound (LC) was larger than that of TiO₂. Photo-catalysis results revealed that the decomposition of dye occurred on the surface of LC. Although increasing LC loadings in supported layered compounds (SLC) enhanced the efficiency of dye photo-decomposition, the specific activity of LC decreased with increase of LC loadings in SLC, which was tentatively ascribed to the decreased effect of electron-transfer between LC and TiO₂ and/or the aggregation of LC on the surface of TiO₂.