Preparation And Properties Of Sn/Bi Based Visible Light Catalysts With Self-assemble Two-dimensional Planar Structures

Organic dyes,heavy metals Cr(VI)are the main source of pollution widespread in the water and soil.Beacause of carcinogenic and induced genetic mutation they are harm to the ecological environment and human health,and cause great potential risks.At present,the defects of commonly treatment method are the complicated process route,the high cost,the low separation efficiency,and the obvious secondary.The photocatalytic technology is a frontier subject in the field of materials and chemistry.A series of nanomaterials are prepared by simple chemical method and controllable structure design.The unique morphology structure can provide more active sites,increase the specific surface area of the material,thereby improving the photocatalytic efficiency.1.A facile generic strategy of combining combustion method and the subsequent acid treatment have been developed to prepare BiOCl single-crystalline 2D nanoplate with rich {0 0 1} facet.Its surface structure contribute greatly to the attractive photocatalytic characteristics under visible light.The photocatalytic conversion of RhB degradation is up to 99.5%after 15 min of irradiation.The concentration of MO decreased sharply with the exposure time,and over 96.5%of MO are degraded within 20 min,showing significantly great efficiency in the photodecomposition of RhB.The exposed {0 0 1} surface in semiconductors should be responsible for the enhanced photocatalytic activity under visible irradiation.This strategy is simple,cheap and mass-productive,which may shed light on a new avenue for large-scale synthesis of facet-dependent semiconductors,photocatalysts and other applications.2.Hollow left CuS@SnS2 is designed and prepared by a simple template-assisted synthesis followed by sulfidation.The synthetic conditions are optimized to control the structure of the product.The hollow structure of the photocatalyst sample enabled multiple reflections of light within the chamber,making use of the light source efficiently.Therefore,the new material showed a remarkable reduction performance for Cr(VI)under visible light irradiation.The concentration of Cr(VI)decreases sharply with the irradiation time,and 98.6%of Cr(VI)is degraded within 4h.This general strategy provides a novel route for the synthesis of hollow left structural materials which can be used for photocatalysis,gas sensing,drug delivery and so on.3.Sn4+ self-doped hollow SnS microcubes are controllably designed by a simple template-assisted synthesis followed by reduction under low temperature.The in situ self-doping enhances the interaction between SnS2 and SnS.The 3D hollow structures of the photocatalyst improve the light efficiency significantly due to multiple effective reflections in the cave.Therefore,this novel material shows a remarkable reduction performance for Cr(VI)and detoxification of cyanide under visible light irradiation.The concentration of Cr(VI)decreases sharply with the irradiation time,and 99.6%of Cr(VI)is degraded within 50 min.Meanwhile,the chromium ions can be adsorbed completely.Moreover,the removal rate for cyanide is as high as 97.2%.Combined with the analysis of in situ ATR-FTIR spectroscopy technology,the photocatalytic reduction mechanism of Cr(VI)is confirmed as a proton coupled electron transfer process.The improved photocatalytic activity of the Sn4+ self-doped SnS can be attributed to the enhanced photoabsorption properties and effective separation of photoinduced charge carriers.This general strategy provides a novel route for the synthesis of hollow cubic structural materials,which can be used for photocatalysis,energy storage and wastewater purification applications.