An efficient ternary silver bromide (AgBr)/silver (Ag)/bismuth vanadate (BiVO4) (AgBr/Ag/BiVO4) photocatalysts with different amounts of Ag and AgBr were obtained by one pot hydrothermal method.The phase composition,micro-morphology and photocatalytic activity of the as-prepared samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and UV-Vis absorption spectra (UV-Vis),respectively.UV-Vis was used to assess its degradation of rhodamine B (RhB) aqueous solution under visible-light irradiation.It was confirmed that AgBr/Ag/BiVO4 was successfully synthesized by XRD,and the photocatalysts was round or irregular polyhedron shape by SEM.Compared with the pure BiVO4,AgBr/Ag/BiVO4 exhibited higher photocatalytic activity.The results indicated that the AgBr/Ag/BiVO4 (8%) showed the highest RhB degradation rate,reaching up to 89.8%.Such enchanced photocatalytic activity was due to the fact that electron from the conduction band of BiVO4 transferred to pure Ag under visible light,then quickly transferred to the valence band of AgBr,whereas photogenerated holes in the valence band of AgBr.This inhibited the recombination of photogenerated electrons and holes.
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基金资助
国家自然科学基金(51502075,21703065);华北理工大学杰出青年基金项目(JP201604)
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