Study On Performance Of Plasmon Resonance Enhanced Visible Light Driven SnS₂ Catalyst

With the rapid development of industry,the discharge of industrial wastewater is increasing year by year,and the pollution of heavy metal water is becoming more and more serious.Photocatalysis technology has been demonstrated to be one efficient and environmental-friendly Cr(IV)wastewater treatment technology.For semiconductor photocatalysts,SnS2 nanomaterials have attracted attention due to their abundant source materials,easy synthesis,low cost nontoxicity.However,for traditional single photocatalyst SnS2,its optical properties are limited,the utilization of sunlight is far from sufficient,photoelectrons and holes have recombination rate,which limits its photocatalytic activity for reduction of Cr(IV).Due to the special optical properties of metal nanoparticles,Nanohybrid photocatalysts composed of metal nanoparticles with local surfac plasmon resonance effect by visible light driven and semiconductor nanostructures have excellent photocatalytic activity under visible light irradiation.In connection with the problem of single semiconductor photocatalyst SnS2,SnS2 was modified by metal nanoparticles with local surfac plasmon resonance effect to prepare composite photocatalyst.The photocatalytic activity of localized surface plasmon resonance enhanced visible light driven photocatalytic of SnS2 were studied and the enhancement mechanism of photocatalytic activity by visible light driven were studied.The main researching content is as follows:1.Ni/SnS2 composite nanomaterials were prepared by hydrothermal method with SnCl4·5H2O,Ni nanoparticles and thiourea as raw materials,and a certain molar ratio of precursor solution was prepared,then put into stainless steel autoclave,and characterized them with XRD,SEM,TEM and UV-Vis.The photocatalytic performance of the composite nanomaterial Ni/SnS2 was tested by using 50mg/L K2Cr2O7 solution to simulate the polluted water source under visible light irradiation.The results show that Ni/SnS2 composite nanomaterials are spherically stacked leading to a larger specific surface than pure SnS2.localized surface plasmon resonance enhanced visible-light-driven photocatalytic of Ni/SnS2 not only can extend the absorption spectrum of SnS2 nanoparticles,but also can restrain the recombination of SnS2 photoinduced electron-hole pairs,thereby the photocatalytic activity of SnS2 nanoparticles can be improved.2.Au/SnS2 composite nanomaterials were prepared by hydrothermal method with SnCl4·5H2O,Au nanoparticles and thiourea as raw materials,and a certain molar ratio of precursor solution was prepared,then put into stainless steel autoclave,and characterized them with SEM and UV-Vis.The photocatalytic performance of the composite nanomaterial Au/SnS2 was tested by using 50mg/L K2Cr2O7 solution to simulate the polluted water source under visible light irradiation.The results show that the surface modification with appropriate amount of Au not only can extend the absorption spectrum of SnS2 nanoparticles,but also can reduce the photoelectron-hole recombination,thereby the photocatalytic activity of SnS2 nanoparticles can be improved.More excellent photocatalyst properties of Au/SnS2 composite photocatalysts,which is ascribed to the surface plasmon resonance effect of Au nanoparticles can improve the absorption of visible light and expand optical response of the SnS2.With the increase of light intensity,the light reaction rate increases,the photocatalytic activity is enhanced.