Preparation And Properties Of Bismuth Based Photocatalytic Materials

With the rapid development of industry,the earth is facing severe energy crisis and environmental pollution problems.In order to relieve the pressure on the earth,researchers have made many efforts,and photocatalysis technology is one of the important areas.Photocatalysis technology is to achieve the effect of degrading pollutants by having a certain oxidation-reduction ability under the conditions of visible light irradiation by photocatalysts.Among the various photocatalysts that have been discovered and have definite scientific basis,the bismuth-based semiconductor material photocatalyst has great research prospects in the field of photocatalysts due to its unique structure.The paper mainly introduces the development status of photocatalysis technology,the principle of photocatalysis technology,and the main influencing factors of photocatalysis performance.In order to improve the photocatalytic efficiency of photocatalytic materials,the following two aspects of experimental work are carried out.The specific content is as follows:（1）Using Bi（NO₃）₃·5H₂O,KCl,and g-C₃N₄ as precursors,and then using water and acetic acid as solvents,g-C₃N₄ and BiOCl were composited by in-situ composite method to prepare BiOCl/g-C₃N₄ composite light catalyst.Use UV-Vis,XRD,SEM and other methods to characterize the morphology and composition of the catalyst,use methyl orange（MO）as the dye to be degraded,and use the advanced technology of photocatalysis to conduct degradation experiments and characterize the photocatalytic activity.The experimental results show that the BiOCl/g-C₃N₄ composite heterojunction photocatalyst exhibits stronger photocatalytic degradation efficiency than BiOCl alone and g-C₃N₄ alone.This is because the recombination of BiOCl and g-C₃N₄ can effectively hinder the recombination of photo-generated electrons and holes,thereby enhancing the photocatalytic activity.（2）Using Bi（NO₃）₃·5H₂O and ammonium metavanadate as precursors,using water as solvent,using hydrothermal method to synthesize BiVO₄,and then using simple stirring method using water as solvent to compound on the prepared BiVO₄g-C₃N₄ and BiVO₄ grow uniformly on g-C₃N₄to form a BiVO₄/g-C₃N₄ composite photocatalyst.The structure,morphology and composition of the catalyst were characterized by UV-Vis,XRD,SEM,etc.,and then the RhB solution was degraded by photocatalytic technology to characterize the photocatalytic activity.The results showed that the BiVO₄/g-C₃N₄ composite material was compared with BiVO₄ alone,g-C₃N₄ shows stronger photocatalytic degradation efficiency.This is because the combination of BiVO₄ and g-C₃N₄ can effectively hinder the recombination of photo-generated electrons and holes,thereby enhancing the photocatalytic activity.