Synthesis and Photocatalytic Activity of TiO2/BiVO4 Layered Films under Visible Light Irradiation

TiO 2 /BiVO 4 layered films were prepared by sol-gel and spin coating methods. X-ray diffraction (XRD), scanning electron microscopy (SEM) and Uv-vis spectroscopy were used to investigate the crystal structure, morphology and ultraviolet-visible absorption of the TiO 2 /BiVO 4 films. The photocatalytic activity of the prepared films was inspected according to the degradation of methylene blue. The results show that the prepared films present a net chain structure; the absorption band edge had obvious red shift. The degradation of the methylene blue solution was about 80% after 300 mins using TiO 2 /BiVO 4 layered films under visible light, which was stronger than when using only pure TiO 2 film and BiVO 4 film.