The preparation characterization and activity evaluation of visible-light-driven photocatalyst Ag_3VO_4

The photocatalyst Ag3VO4 was prepared by the chemical precipitation method.The photocatalyst was characterized by X-ray powder diffraction(XRD),UV-Vis diffuse reflectance spectroscopy(UV-Vis) and Photoluminescence(PL) emission spectra.The photocatalytic activity of the photocatalyst was evaluated by photocatalytic reduction of Cr2O2-7 and photocatalytic oxidation of Methyl Orange(MO).The effect of different preparation conditions on the photocatalytic activity of Ag3VO4 was investigated.The results showed that the Ag3VO4 photocatalyst prepared in the presence of excess silver exhibited the excellent photocatalytic reduction activity of Cr2O2-7 and photocatalytic oxidation activity of Methyl Orange(MO) under visible light irradiation.And the photoabsorption wavelength range of the photocatalyst red shifts and the utilization of the total spectrum improves.As for the Ag3VO4 photocatalyst(Ag/V=6:1),the stability and cycling runs are studied.The possible mechanisms of influence on the photocatalytic activity of the Ag3VO4 photocatalyst were also discussed.