Sulfide Preparation And Visible Photocatalytic And Composites Containing Indium

Metal sulfide has been extensively studied because of its narrow bandgap canmake good use of visible light, it has many applications in photocatalytic hydrogenproduction and the degradation of origanic pollution, but the disadvantages can not beignored, low stability, photocorrosion and so on. Therefore, we proved a method ofsynthesis of ternary metal sulfides and its complexes, as well as composite structuresof two different metal sulfides, these catalysts could overcome the above disadvantagesin the photocatalytic field and exhibit excellent catalytic properties and high stability.The main contents in this paper were as following:1. The ternary metal sulfides ZnIn2S4with hierarchical flower-like structure wassynthesized by a simple solvothermal method. In the experiment, In(NO)3was used asindium source, Zn(AC)2was used as zinc source, L-cysteine hydrochloride was bothused as sulfur source and surfactant, the hexagonal phase fluffy folwer-like ZnIn2S4microspheres can be obtained after heating. When the temperature and reaction time ofthe system were changed, the morphology and size of the final product were alterred,the growth mechanism has also been researched in the context. The synthesizedflower-like catalyst with a high specific surface area exhibited excellent performancein hydrogen evolution under visible light irradiation after a certain amount loaded ofPt.2. A reduced graphene oxide (RGO)/ZnIn2S4nanosheet composite wassuccessfully synthesized via an in situ controlled growth process. We add GO to thepreparation system of flower-like ZnIn2S4to obtain the RGO/ZnIn2S4nanosheetscomposite via a simple ‘‘in situ controlled growth’’ solvothermal process. This closesheet-on-sheet material could create a notable synergistic effect between two layers,which could suppress the charge recombination, improve the interfacial charge transfer;The excellent electron transport property and extremely high specific surface of graphene will further improve the photocatalytic properties of ZnIn2S4. So thesynthesized RGO/ZnIn2S4composite demonstrated excellent visible light H2production activity in visible light irradiation without expensive Pt loaded as acocatalyst.3. Core/shell heterostructure composite has great potential applications inphotocatalytic field because the introduction of core can remarkably improve chargetransport and enhance the electron-hole separation. Herein, hierarchical Bi2S3/In2S3core/shell structured microspheres were prepared via a simple one-pot hydrothermalprocess based on different growth rate of the two kinds of sulphides. The resultsshowed that, the as-prepared hierarchical Bi2S3/In2S3core/shell heterostructure exhibitssignificant visible light photocatalytic activity for degradation of2,4-dichlorophenol.The introduction of Bi2S3core can not only improve charge transport and enhance theelectron-hole separation, but also broaden the visible light response. The hierarchicalporous folwer-like shell of In2S3could increase the specific surface area andremarkably enhanced the chemical stability of Bi2S3against oxidation.