Preparation, characterization and photocatalytic activity of polycrystalline Bi2O3/SrTiO3 composite powders

Abstract Bi 2 O 3 /SrTiO 3 composite powders have been prepared and their photocatalytic activities were investigated by photooxidation of methanol. These powders were characterized by UV–Visible diffuse reflectance spectra, SEM and X-ray diffraction (XRD). The results revealed that all the Bi 2 O 3 /SrTiO 3 composite powders exhibited higher photocatalytic activity than pure SrTiO 3 , Bi 2 O 3 and TiO 2 (P25) under visible light irradiation ( λ >440 nm). The effects of the Bi 2 O 3 contents on the photocatalytic activities of the composite powders were examined, the photocatalytic activities increased with the content of Bi 2 O 3 increasing to a maximum of 83% and then decreased under visible light irradiation. The effects of the calcination temperatures on the photocatalytic activities of the composite powders were also investigated.

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