Preparation And Its Photocatalytic Properties Of Bismuth Oxide Based Heterojunction

Bismuth oxide?Bi₂O₃?,as a semiconductor photocatalyst,can effectively absorb visible light,but it still has some problems in the application process,such as low separation efficiency of photoelectron-hole pair and fast recombination rate.In view of the above shortcomings,this paper constructed three bismuth oxide base photocatalytic composites of?-Bi₂O₃/Bi₅O₇I/Bi OI,?-Bi₂O₃/Cd S,and?-Bi₂O₃/Bi OI by electrophoretic deposition to solve the above problems.The?-Bi₂O₃/Bi₅O₇I/Bi OI composites were obtained by electrophoretic deposition.XRD,TEM,PL,UV-vis DRS,EIS,mott-schottky were used to characterize.The composites photocatalyst were obtained by controlling the amount of I₂,the transformation from?-Bi₂O₃ to Bi₅O₇I and then to Bi OI was realized to form?-Bi₂O₃/Bi₅O₇I/Bi OI.The microstructure of?-Bi₂O₃/Bi₅O₇I/Bi OI was honeycomb.PL characterization showed that composites effectively inhibit photo-generated carrier recombination.Electrochemical tests showed that?-Bi₂O₃/Bi₅O₇I/Bi OI composites had higher carrier concentration and faster separation rate.After the cyclic degradation of acid fuchsin by?-Bi₂O₃/Bi₅O₇I/Bi OI composites?C4?for 50 times under simulated sunlight irradiation,diffraction peaks of?-Bi₂O₃was disappeared,but the photocatalytic degradation efficiency still reach more than80%,indicating that the high photocatalytic activity is caused by Bi₅O₇I/Bi OI.The?-Bi₂O₃was obtained by sol-gel method and Cd S was obtained by water bath method,?-Bi₂O₃/Cd S composites were obtained by different molar ratios.XRD,SEM,PL,Raman,FT-IR,UV-vis DRS,EIS were used to characterize.The uv-visible diffuse reflectance spectrum showed that the visible light response range of?-Bi₂O₃/Cd S composites increased.EIS testing showed that the migration rate of electrons in?-Bi₂O₃/Cd S composites increased.The results of degradation of methyl orange?MO?in BC45 samples under simulated sunlight showed that the photocatalytic degradation efficiency was 87%,57%higher than that of?-Bi₂O₃.The photocatalytic degradation efficiency of acid fuchsin dye was 81%,57%higher than that of?-Bi₂O₃.The?-Bi₂O₃was obtained by calcination method,and different proportions of?-Bi₂O₃/Bi OI composites were obtained by different amount of I₂by electrophoretic deposition method.The?-Bi₂O₃ could be directly converted to Bi OI with I₂ at 25 V.XRD,SEM,PL,UV-vis DRS,EIS were used to characterize.PL characterization indicated that?-Bi₂O₃/Bi OI composites could effectively inhibit electron-hole pair recombination.UV-vis DRS indicated that?-Bi₂O₃/Bi OI composites increased the visible light absorption range.The photocatalytic of acid fuchsin dye degradation efficiency of?-Bi₂O₃/Bi OI?D3?composites still over 75%after 50 times under visible light irradiation,no diffraction peak disappeared,indicating that?-Bi₂O₃/Bi OI has good stability and reusability.