Abstract
We report a novel Bi2Sn2O7/Ag-AgCl photocatalysts with excellent visible-light-driven photocatalytic properties. The crystalline Bi2Sn2O7 was synthesized by solid-state reaction at 550°C. Then Bi2Sn2O7/Ag-AgCl was prepared using deposition-precipitation technique followed by photo-reduction of partial Ag+ to Ag0 nanoparticles on surface of AgCl. The photocatalysis were evaluated by degrading organic dyes under controlled conditions. The Bi2Sn2O7/Ag-AgCl composite exhibited a much improved photocatalysis, approximately 7 times stronger than that of pure Bi2Sn2O7, primarily due to its enhanced visible-light absorption and high separation efficiency of charge. On the basis of band structure analysis, a possible mechanism of photocatalysis enhancement for Bi2Sn2O7/Ag-AgCl is proposed. The strong photocatalytic capability, together with simplicity of fabrication suggests Bi2Sn2O7/Ag-AgCl composite provided in this study may have certain practical applications in water treatments. Additionally, the study implies a novel but simple methodology that may be also applicable in construction of other types of single semiconductor/plasmonic composite photocatalysts.
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