The Synthesis Of Bismuth Oxychloride And Its Composites And Study On Their Photocatalytic Properties

With the development of modern industrialization,environmental pollution problems have become more and more serious.Photocatalytic technology is considered to be a low-cost,efficient,and green technology to control environmental pollution.BiOCl is considered to be a photocatalyst with potential application prospects due to its advantages of non-toxicity,strong oxidizing property,and high stability.However,the band gap of BiOCl is so wide that is only responds to ultraviolet light,and the recombination rate of photogenerated electrons and holes is so serious,which severely restricts its photocatalytic activity.In this paper,the metal/semiconductor heterojunction（Ti₃C₂-Bi/BiOCl）and semiconductor/semiconductor heterojunction（BiOCl/Cu Bi₂O₄）were designed by loading metals,constructing heterojunctions,and introducing oxygen vacancies.And then study their photocatalytic activity and activity enhancement mechanism.The main research contents are as follows:1.The Ti₃C₂-Bi/BiOCl heterojunction photocatalyst was prepared by solvothermal method.Compared with BiOCl and Bi/BiOCl,Ti₃C₂-Bi/BiOCl heterojunction exhibits higher photocatalytic performance when degrading antibiotic ciprofloxacin（CIP）under visible light irradiation,and its rate constants are 22.26 and 1.76 times higher than that of BiOCl and Bi/BiOCl,respectively.In addition,the NO removal rate of 40%Ti₃C₂-Bi/BiOCl heterojunction can reach 75%under visible light.The improvement of its photocatalytic activity is mainly attributed to the SPR effect of Bi metal and the conductivity of Ti₃C₂,which effectively enhances the light absorption capacity and the separation and transfer of photogenerated carriers.2.The BiOCl/Cu Bi₂O₄ S-scheme heterojunction photocatalyst with oxygen vacancies was designed and synthesized by a simple solvothermal method.BiOCl/Cu Bi₂O₄ S-scheme heterojunction exhibits enhanced photocatalytic performance for degrading diclofenac（DCF）under visible light irradiation,and its rate constants are 25.46 and 11.09 times higher than that of Cu Bi₂O₄ and BiOCl,respectively.In addition,the NO removal rate of BiOCl/Cu Bi₂O₄S-scheme heterojunction is 40%under visible light irradiation,and the amount of produced NO₂ is lower than that of BiOCl.This is mainly due to the improved separation and transfer of photogenerated charges and redox ability by the construction of the S-scheme heterojunction.On the other hand,the introduction of oxygen vacancies also enhances the light absorption ability and promotes the separation and transfer of photogenerated charges.The work in this section provides a new insight in constructing high-performance S-scheme heterojunction photocatalysts for environmental pollution remediation.