论文部分内容阅读
Ag/AgBr/GdVO4 composite photocatalysts were designed and synthesized in this paper.The physical and chemical structures,as well as optical properties of the synthesized composite were investigated via XRD,XPS,TEM,and UV-vis.It is found that the composite showed a tary heterojunction structure of Ag,AgBr and GdVO4.Meanwhile,it has a high intensity of light current,indicating its high separation efficiency of electron and hole.Photocatalytic oxidation of rhodamine B (RhB) under visible light irradiation was performed to investigate the activity of the Ag/AgBr/GdVO4 composite.Result indicates that it shows excellent photocatalytic activity.Under visible light irradiation for 12 min,about 80％ of RhB (30 μmol/L) was degraded.The degradation rate is estimated to be 0.253 min-1,which is three times higher than that of pure AgBr.The high photoactivity can be ascribed to the synergetic effect of AgBr,GdVO4,and Ag nanoparticle in separation of electron-hole pairs.