Synergistic Effect Of Visible-light-responsed BivO₄Microstructures On Fenton-reaction

The visible light catalyst was introduced into Photo-Fenton reaction, to form amulti-reaction system, and the synthesis conditions were optimized. Fe3O4magneticnano-particles was prepared by solvothermal synthesis on this study, and themicrostructure of the prepared magnetic particles were characterized, while thepreparation conditions were optimized. micro-scaled BiVO4and BiVO4/Fe3O4withwell-defined morphologies were synthesized by hydrothermal process. Producedphase composition and morphology could be controlled by adjusting pH value ofreaction solution, surfactant type and Fe3O4doping amount. According to explore therelationship between the synthetic conditions and product morphology during thehydrothermal process, then found the optimum technological conditions forpreparation of BiVO4/Fe3O4composite micro structure. Regarding the photocatalyticdegradation of rhodamine B (RhB) as a model reaction, investigated the difference ofdegradation performance between BiVO4and synergistic effect ofvisible-light-responsed BiVO4microstructures on Fenton-reaction. At the same time,investigated different preparation conditions on synergistic effect of BiVO4/Fe3O4Microstructures on Fenton-Reaction and recovery. The samples were characterized byX-ray powder diffraction (XRD), scanning electron microscopy (SEM)、 UV-Visdiffuse reflection spectroscopy(UV-Vis DRS) and accelerated surface area andporosimetry system, respectively. Under visible light irradiation, synergistic effects ofBiVO4microstructures with Fenton-reaction were evaluated via the degradation ofRhodamine B (RhB), then optimaized the preparation conditions of compositephotocatalyst.With poly(vinyl pyrrolidone)(PVP) as a surfactant, Fe3O4doping amount as0.2%wt, micro-scaled BiVO4/Fe3O4with well-defined morphologies were synthesized by hydrothermal process. Produced phase composition and morphology could becontrolled by adjusting pH value of reaction solution. According to the experimentalresults, BiVO4/Fe3O4of monoclinic scheelite type obtained in pH=7displayed themost defined microstructure, as well as the largest surface area and the bestphotocatalytic activity. Remarkable degradation performance on organic dye wasobtained that99%of RhB can be degradated within60min under visible-light, whichdisplays a efficient visible light absorption efficiency and photocatalysis activity.With urea as a surfactant, Fe3O4doping amount as0.2%wt, Round cakeBiVO4/Fe3O4with diameter of about4.5~6.5μm were synthesized in pH=1byhydrothermal process. Synergistic effects of BiVO4microstructures withFenton-reaction performs a remarkable degradation on organic dye，and displays amore efficient visible light absorption efficiency and photocatalysis activity. WhenFe3O4doping amount adjusted to10%wt under the same conditions, Round cakeBiVO4/Fe3O4with diameter of about5.5~7.5μm were synthesized. This kind ofstructure compositing of Fe3O4particles displays ferromagnetic andsuperparamagnetic, so that this excellent mosaic structure shows the best ability ofrecovery.The results reveals that the visible light catalyst was introduced intoPhoto-Fenton reaction, synergistic effects of BiVO4microstructures withFenton-reaction performs a remarkable degradation on organic dye when Fe3O4doping amount is0.2%wt.