Research On The Preparation And Photocatalytic Performance Of Tin Sulfide-based Composite Materials

Photocatalytic technology can effectively solve environmental pollution and energy crisis,so photocatalytic technology has been favored by researchers from various countries in recent years.The core of photocatalysis technology is the photocatalysts,therefore,the development of an efficient and low-cost photocatalyst has become a research hotspot.Among many photocatalytic materials,tin sulfide has attracted the attention of researchers due to its narrow band gap.However the photocatalytic application of tin sulfide is limited due to the disadvantages such as photogenerated carriers recombination.However,this disadvantages can be better improved by recombining with a semiconductor material with a wider band gap.In addition,traditional tin sulfide preparation methods have disadvantages such as high energy consumption and inability to widely production.Based on the above reasons,this paper uses a low-heat solid-state method with low energy consumption and high yield to prepare tin sulfide-based composite materials to improve the photocatalytic performance of tin sulfide,as follows(1)Flower-like SnO₂/SnS₂composites were synthesized by one-step solid-state method at low temperature and the composition and morphology of the composite material were studied by XRD,TEM and XPS techniques.The photocatalytic performance of the composite was studied by photocatalytic degradation of methyl orange and Cr(?).The experimental results show that when the molar ratio of SnO₂to SnS₂is 5:5,the material exhibits the highest photocatalytic degradation performance.Fluorescence and photocurrent tests proved that the recombination of SnS₂significantly reduced the recombination efficiency of photogenerated carriers of SnO₂.Finally,the active material species of the composite material in the photocatalytic degradation process were studied through the capture agent experiment,and the Type II photocatalytic mechanism was proposed.(2)SnS₂/MnS₂composites were synthesized by one-step solid-state method at low temperature using tin tetrachloride pentahydrate,manganese acetate,and thioacetamide as raw materials.The composition and morphology of the composite material were studied by XRD,TEM and XPS techniques.TEM results show that the composite material presents a flower-like structure.The material exhibits the highest photocatalytic degradation performance when the molar ratio of SnS₂to MnS₂is 5:5.The degradation rate of methyl orange reached 98%and 96%after 120 min of ultraviolet light and visible light irradiation.The photocurrent test proved that the compounding MnS₂significantly improved the photo-generated carrier recombination efficiency of SnS₂.Finally,the active substances in the photocatalytic process of the composites were studied through the detection of photocatalytic active species,and the photocatalytic mechanism was proposed.(3)SnS₂/MnS₂-Cl composites were synthesized by one-step solid-state method at low temperature using pentahydrate,manganese chloride,and thioacetamide as raw materials,and the composition and morphology of the composite material were studied by XRD,TEM and XPS techniques.The material exhibits the highest photocatalytic degradation performance when the molar ratio of SnS₂to MnS₂is 5:5.The photocurrent test proved that compounding MnS₂significantly improved the photo-generated carrier recombination efficiency of SnS₂.Finally,the composite materials of different manganese sources were compared,and the effects of different manganese sources on the crystallinity,photocatalytic performance and carrier separation efficiency of the composite materials were studied.