| Water pollution caused by industrialization and urbanization has become one of the most serious environmental problems and brought serious threats to living environments.Semiconductor photocatalysis are considered as promising candidates for their potential application in utilization of solar energy to solve the problem of water pollution.As a novel semiconductor photocatalyst,Bi2Sn2O7 has received extensive interests due to its efficient visible-light-driven photocatalysis,low price,non-toxic and chemical stability.In this study,pure Bi2Sn2O7 was synthesized by hydrothermal method and high temperature solid-state reaction method,respectively.And composite photocatalysts were prepared by combine Bi2Sn2O7 with other material.Furthermore,the pure Bi2Sn2O7 film and Bi2Sn207/Ag@AgCl film on conventional silicate glass were successfully prepared by a facile but novel method.The crystalline properties,morphology and photoeletrochemical properties of materials prepared in this study were characterized by Uv-vis diffuse reflectance spectroscopy,X-ray diffraction,scanning electron microscopy and other characterization method.Methylene blue,methyl orange and acid red 18 were used as the representative organic pollutants to evaluate the photocatalytic activities of the as-prepared samples.Bi2Sn2O7 was well synthesized by hydrothermal method and high temperaure solid-state reaction method successfully,exhibiting photocatalysis activity in degrading dyes under visible light irradiation.In addition,comparing with pure photocatalyst,Bi2Sn2O7/g-C3N4 composite and Bi2Sn2O7/Ag-AgCl composite exhibited a much improved photocatalysis due to its enhanced visible light absorption and efficient separation of electrons and holes.Bi2Sn2O7/Ag@AgCl film was uniform and exhibited excellent visible light catalytic performance for degradation of organic dyes,with a number of favorable characteristics including self-cleaning ability,stability and reusability which had practical application. |
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