Study On Preparation And Photocatalytic Properties Of Bismuth Photocatalyst Composites

As a new visible light semiconductor material,BiOI and BiVO₄ can absorb visible light,but BiOI and BiVO₄ still have problems in application,such as low separation efficiency of photogenerated electron hole pairs and high composite probability.In view of the above problems,three ruthenium-based photocatalytic composite materials,msBiVO₄/tzBiVO₄,BiVO₄/rGO and BiOI（001）/BiOI（010）,were prepared.The main research contents and results are as follows:1.A composite material having two phases of msBiVO₄/tzBiVO₄（A18）was prepared by a hydrothermal method.XRD,SEM,X-ray photoelectron spectroscopy（XPS）,photoluminescence spectroscopy（PL）and UV-visible diffuse reflectance spectroscopy were used to characterize.From the morphology analysis,the msBiVO₄/tzBiVO₄ composite is a special structure formed by inserting the plate-shaped msBiVO₄ inserting into the spherical tzBiVO₄.The photocatalytic performance test of the sample degrading methyl blue under simulated sunlight showed that the photocatalytic degradation of methyl blue by msBiVO₄/tzBiVO₄composite under simulated sunlight was 93%.2.BiVO₄/rGO composites with different rGO contents were prepared by hydrothermal method.XRD,TEM,Raman,X-ray photoelectron spectroscopy,fluorescence spectroscopy and UV-visible diffuse reflectance spectroscopy were used to characterize.The UV-visible diffuse reflectance spectroscopy results show that the visible light absorption range of BiVO₄/rGO is increased.The photocatalytic performance of the sample degrading methyl blue under simulated sunlight showed that the photocatalytic efficiency of BiVO₄/rGO was 60%and the rate constant was0.00760 h^-1 when the addition amount of rGO was 0.0180 g.3.The pure phase BiOI（010）was prepared by hydrothermal method,and BiOI（001）/BiOI（010）with different molar ratios was prepared by chemical transformation.XRD,SEM,TEM,Raman,X-ray photoelectron spectroscopy,fluorescence spectroscopy and UV-visible diffuse reflectance spectroscopy were used to characterize.The results of UV-visible diffuse reflectance spectroscopy indicate that the absorption range of BiOI（001）/BiOI（010）is increased.The photocatalytic performance test results of the degradation of methyl orange in the simulated sunlight show that When the molar ratio of BiOI（001）/BiOI（010）prepared was1:0.75,the degradation efficiency of methyl orange under simulated sunlight was85.7%.