Synthesis And Photocatalytic Performance Of In/Bi-based Semiconductor Composites

Photocatalytic is a kind of environmental remediation technology with deep oxidizing ability,has the advantages of high-efficiency,energy-saving and mild reaction conditions,is considered to be one of the effective ways to solve the current water pollution.The technology is the use of visible light and photocatalytic materials combined to achieve the degradation of pollutants,thereby purify the water environment.At present,the modification photocatalytic materials and broaden light response range of the materials are the research fouse in the photocatalytic filed.In this paper,visible light response photocatalytic materials,such as indium vanadate?InVO₄?and bismuth oxybromide?BiOBr?were used as the research object,through the semiconductor complex to modify photocatalytic materials,improving the quantum efficiency and broaden light response range,to enhance its photocatalytic performance.The main research contents of this paper are as follows:?1?Fabrication of InVO₄/Cd S composites and its photocatalytic activityInVO₄/Cd S composites were prepared by microwave-assisted and hydrothermal methods,the photocatalytic activities of the composites were evaluated by the degradation of rhodamine B and ciprofloxacin.The crystal structure,morphology and optical properties of the composites were characterizated by XRD,FESEM,HRTEM,XPS and DRS.The separation efficiency of photogenerated electron-hole pair's was studied by transient photocurrent tests.The stability of composites was studied by cycle experiments.The predominant active species were verified by trapping experiment and electron spin resonance?ESR?,and the photocatalytic reaction mechanism of the composites was also proposed.?2?In-situ fabrication of Bi₂S₃/BiOBr composites and its photocatalytic activityBiOBr nanosheets were synthesized by precipitation method,after that,the Bi₂S₃/BiOBr composites were prepared by anion exchange reaction with thioacetamide.The photocatalytic activity was investigated by degradation of rhodamine B under visible light.The composites were carefully characterized by XRD,FESEM,HAADF-STEM and XPS.DRS analyzed the light absorption ability of the composites.The fluorescence?PL?and transient photocurrent were used to study the separation efficiency of photogenerated electron-hole pair's.The stability of composites was studied by cycle experiments.Through the trapping experiment and electron spin resonance?ESR?to verify the predominant active species,and the photocatalytic reaction mechanism of the composites was also proposed.?3?Fabrication of Mn WO₄/BiOBr composites and its photocatalytic activities Mn WO₄/BiOBr composites were prepared by hydrothermal and solvothermal methods,the photocatalytic activities of the composites were investigated by the degradation rhodamine B and tetracycline.The composites were carefully characterized by XRD,FESEM,TEM,DRS and so on.The stability of composites was studied by cycle experiments.Photocurrent and impedance?EIS?tests were employed to evaluated the separation efficiency of photogenerated electron-hole pair's.The active species responsible to photocatalytic reaction were verified by the trapping experiment,and the photocatalytic reaction mechanism of the composites was also proposed.