Synthesis and Photocatalytic Degradation Study of Methylene Blue Dye under Visible Light Irradiation by Fei-_xBixVO_4 Solid Solutions (0 ≤ x ≤ 1.0)

摘要

The novel hetero-structures Fei-xBi_xVO_4 solid solutions (0 < x < 1.0) with the two dissimilar end member of FeVO_4 - BiVO_4, were successfully synthesized by the standard solid state reaction method. The structural and chemical properties of as prepared photo-catalyst samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR) and UV-visible absorption spectroscopy techniques. It is confirmed from the results of XRD, Raman and FT-IR that FeVO_4 and BiVO_4 are in triclinic (space group P-l (2)) and monoclinic (space group I2/b (15)) phases respectively. The Bi incorporation into Fe site of FeVO_4 emerges as hetero-structures of both the end members of the solid solutions. In addition, the photocatalytic activity in the degradation of methylene blue (MB) dye under visible light irradiation was carried out through UV-visible spectroscopy measurement of photo-catalysts FeVO_4, BiVO_4 and mixed phases of both photo-catalyst. The results indicate that under visible light irradiation the photocatalytic activity of mixed phases were very effective and higher than the both single phases of the solid solutions. The composition x=0.25 exhibits an excellent photocatalytic property for the degradation of MB solution under visible light irradiation rather than other.