Construction And Photocatalytic Performance Of Metal Sulfide Heterojunction

With the prosperity and development of society,resource shortage,environmental pollution and other issues are particularly serious.It is urgent to find an efficient,sustainable and environment-friendly technology to solve the above problems.Semiconductor photocatalytic technology is considered as one of the most potential strategies,but most of catalysts have poor carrier separation efficiency,low quantum efficiency,serious photocorrosion,structural instability and other problems.So,it is imperative to develop and design a new type of efficient photocatalyst.This article focuses on constructing of metal sulfide heterojunction catalysts for hydrogen production and antibiotics remove,the main research content is as follows:（1）Cd S nanoparticles were loaded on NH₂-MIL-125（Ti）nanodisks through hydrothermal method.Close contact and matched band structure of two specials significantly contributed to the separation of charge carriers,and further increased Cd S photocatalytic activity.（2）The unique Z-type heterojunction of Zn In₂S₄/NH₂-MIL-125（Ti）was constructed to effectively remove antibiotics under visible light.The main contents are as follows:First,the generation and development history of photocatalyst and the basic mechanism are described.The improvement means and methods of catalysts are stated.The research status of metal sulfide and metal-organic framework（MOF）is summarized,which provides a new idea for the design of heterojunction photocatalyst.Second,Cd S nanoparticles were anchored on NH₂-MIL-125（Ti）nanodisks to form Z-scheme heterojunctions by regulating different load ratios of Cd S.The experimental results showed that close interface contact between two specials and matched energy band structure greatly promote the carrier separation,and significantly inhibit the photocorrosion phenomenon of Cd S.On the condition of visible light,the hydrogen evolution rate of optimized Cd S/NH₂-MIL-125（Ti）heterojunction was as high as 6.62 mmol·h^-1·g^-1,which was3.5 times that of pure Cd S.In this chapter,we focus on the construction of heterojunction photocatalyst,which provides new insights for energy conversion and other aspects.