A series of Ag/Sn3O4 photocatalysts were prepared by a simple photodeposition method.When the mass fraction of Ag was 3% (3% Ag/Sn3O4),the composite photocatalysts showed the best photocatalytic activity.The degradation rates of Cr(Ⅵ)pollutants at 10 mg/L and 20 mg/L were 87.72% and 76.80%,respectively.The Ag/Sn3O4 photocatalyst was characterized by UV-Ⅵs diffuse reflection spectroscopy(UV-ⅥS DRS),scanning electron microscopy(SEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS),and the photocatalytic degradation activity and mechanism of Cr(Ⅵ)were studied in detail.The photoluminescence(PL)results showed that the tight binding between Ag and Sn3O4 components improved charge separation and transfer,and the specific surface area,pore volume and reaction rate constant k of 3% Ag/Sn3O4 were 7.3,4.6 and 1.8 times that of pure Sn3O4,respectively.In this study,a small amount of Ag is loaded on Sn3O4 to efficiently degrade Cr(Ⅵ)pollutants,and the obtained catalyst Ag/Sn3O4 effectively promotes photogenic carrier transfer due to the Ag-rich active site.
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