High degradation of BIVO4 nanoparticle for organic dyes under visible light irradiation mediated by S2O8

Abstract

In this study, we have successfully synthesized BiVO4 materials by hydrothermal method. The degradation of methylene blue (MB) under LED visible light mediated by S2O8/BiVO4/Vis system. The obtained BiVO4 catalyst was characterized by X-ray diffraction (XRD), Raman, scanning electron microscope (SEM), and UV-visible diffuse reflectance spectrum (UV-vis DRS). We investigated the effect of S2O8 concentrate, pH value and initial concentration on the removal rate of MB. The results of XRD spectra showed that the BiVO4 fragment has a crystalline structure in moneblinite monoclinic phase alone. The degradation of MB concentration under visible light mediated S2O8/BiVO4/Vis was 78% after 100 minutes of irradiation. The band gap (Eg) of BiVO4 was estimated to be 2.39 eV. Therein, the presence of Na2SO4 anions decrease concentration of MB with compared to the original using S2O8/BiVO4 system alone.