Preparation and Activities of Visible-Light-Driven BiVO_4 by Doping Zn~(2+) via Solid State Method

摘要

Using Bi(NO_3)_3·5H_2O, NH_4VO_3 and Zn(NO_3)_2·6H_2O as raw material, Zn-doped BiVO4 photocatalysts were successfully prepared by a lowtemperature grinding synthesis. And the samples were characterized by X-ray diffraction (XRD), Infrared spectroscopy (FT-IR) and UV-Vis diffuse reflectance spectroscopy (DRS). The Methyl Orange (MO) was simulated as the sewage under the visible light to study the influence of the illumination time and the amount of photocatalyst. The visible-light absorption scope of BiVO_4 was broaden by doping Zn~(2+), the UV-Visible absorption edge was slightly red shifted and the band gap was narrowed comparing with the pure BiVO_4. It was found that the catalytic effect of the Zn-doped catalysts was enhanced under the visible-light irradiation. The cause of enhanced catalytic effect has also been analyzed and discussed in the article.