Preparation And Photocatalytic Properties Of β-Bi₂O₃ Based Multiple Heterojunction

Semiconductor photocatalysis technology,which uses semiconductor materials as catalyst to degrade organic pollutants and prepare clean energy such as H₂ and CH₄by solar energy,is an emerging technology to solve the increasingly serious environmental pollution and energy crisis.Among them,the light absorption ability of semiconductor materials,carrier separation efficiency and other factors directly determine the performance of the final photocatalytic materials.In this paper,Bi based nano photocatalytic materials were used based onβ-Bi₂O₃,the structure of the binary and ternary heterostructures ofβ-Bi₂O₃ are discussed preparation and composition ofβ-Bi₂O₃based multi-component heterostructure and its effect on photocatalytic performance.The main contents are as follows:β-Bi₂O₃/Bi₂O₂CO₃（BO/BOC）heterojunction was prepared by calcining the precursor Bi-EG.the effects of calcination time on the phase,structure and photocatalytic performance of the heterojunction were investigated.The results showed that the sample BO/BOC-4 calcined for 4 hours showed the best photocatalytic performance,and the degradation efficiency of organic dye methyl orange was nearly 2.1 times higher than that of singleβ-Bi₂O₃;PL spectra and photocurrent measurements show that BO/BOC-4 has higher carrier separation efficiency,which also confirms this fact.Based onβ-Bi₂O₃/Bi₂O₂CO₃ binary heterojunction,B-doped g-C₃N₄ was synthesized the ternary heterojunctionβ-Bi₂O₃/Bi₂O₂CO₃/B-C₃N₄（BO/BOC/BCN for short）based onβ-Bi₂O₃showed no other heterophase in the system by XRD.DRS and PL analysis showed that after the formation of the ternary heterojunction,the absorption ability and carrier separation ability were significantly enhanced.The photocatalytic performance of BCN/BO/BOC-10 sample was the best,and 5 mg/L methyl orange solution could be degrade 99%under 1 h illumination.