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Polyaniline (PAn) sensitized nanocrystalline TiO_2 composites (TiO_2/PAn) were successfully prepared and used as an efficient photocatalyst for the degradation of dye methylene blue (MB).The results showed that PAn was able to sensitize TiO_2 efficiently and the composite photocatalyst could be activated by absorbing both the ultraviolet and visible light (λ:190~800nm),whereas pure TiO_2 absorbed ultraviolet light only (λ<380nm).Under the irradiation of natural light,MB could be degraded more efficiently on the TiO_2/PAn composites than on the TiO_2.Furthermore,it could be easily separated from the solution by simple sedimentation.
The results showed that PAn was able to sensitize TiO_2 efficiently and the composite photocatalyst could be be used as an efficient photocatalyst for the degradation of dye methylene blue (MB). Polyaniline (PAn) sensitized nanocrystalline TiO_2 composites (TiO_2 / PAn) were successfully prepared and used as an efficient photocatalyst for the degradation of dye methylene blue activated by absorbing both absorbing and absorbing light (λ: 190~800 nm), while pure TiO 2 by ultraviolet light only (λ <380 nm) .Under the irradiation of natural light, MB could be degraded more efficiently on the TiO_2 / PAn composites than on the TiO_2.Furthermore, it could be easily separated from the solution by simple sedimentation.