Study Of TMDCs Based Heterojunction Construction And Induce ROS Selectivity For Antibiotic Wastewater Degradation

Environmental pollution and energy shortages are becoming more and more serious.Renewable solar energy has become one of the main energy sources used by people.Therefore,green and efficient photocatalysis technology has received widespread attention.With the gradual maturity of the application of photocatalytic technology,the performance requirements for photocatalytic materials have gradually increased.However,most photovoltaic semiconductor materials have the problem of low activity.Because of its unique layered structure and large band gap,bismuth oxychloride（Bi OCl）cannot respond well to the visible light region of sunlight,which limits its practical application.Transition metal sulfides（TMDCs）have excellent electrical conductivity and semi-metal properties,which can effectively improve the material’s light utilization efficiency.Therefore,in this paper,in order to improve the photocatalytic activity of bismuth oxychloride,bismuth oxychloride and transition metal sulfides（TMDCs）were compounded to modify bismuth oxychloride（Bi OCl）,such as introducing oxygen vacancies and constructing heterogeneous.As a result,the activity of the new photocatalytic material produced by the composite has been improved,and the following studies have been carried out:1.It is proposed that the Cu S metal materials with the existing plasmon resonance effect are introduced through the microwave-assisted synthesis method,and the Z-scheme Cu S/Bi OCl heterojunction material with rich oxygen vacancies is successfully synthesized.The morphological structure of the composite sample and the influence of defect concentration.By constructing a Z-scheme heterojunction,the photogenerated electron-hole pairs are effectively separated and their respective high-efficiency redox abilities are retained,so that hydroxyl radicals（·OH）are generated in the valence band of Bi OCl,and the conduction band of Cu S generates super Oxygen free radicals（·O₂^-）and singlet oxygen（¹O₂）provide new ideas for the preparation of photocatalytic materials with high-efficiency photocatalytic properties,and analyze their possible photodegradation mechanisms.2.Proposed a two-step microwave method and ultrasonic method,introduced Bi₂Se₃ quantum dot material,and successfully synthesized Bi₂Se₃/Bi OCl Schottky heterojunction structure with reasonable oxygen vacancy（OVs）concentration.And by adjusting the dosage of Bi₂Se₃,the nanosheet thickness and oxygen vacancy concentration of the material can be controlled.It is discussed that the introduction of Bi₂Se₃ quantum dot material effectively captures photogenerated electrons,promotes the spatial separation and migration efficiency of photogenerated carriers,and induces activated molecular oxygen to produce superoxide radicals（·O₂^-）and singlet oxygen（¹O₂）.So as to provide a new idea for the preparation of photocatalytic materials with high-efficiency photocatalytic properties,and analyze the possible photodegradation mechanism.3.A Z-scheme Mo₂S₃/Bi OCl heterojunction material with reasonable oxygen vacancies（OVs）was successfully synthesized by in-situ template method.It is discussed that oxygen vacancies are effectively passivated by forming Mo-O bonds on the interface of Mo₂S₃ and Bi OCl.The interfacial electric field formed at the interface of the two substances not only enhances the space separation and migration efficiency of photogenerated carriers,but also helps to produce abundant ¹O₂,which provides a new way for studying the formation of ¹O₂ and provides a way to pass A new strategy to adjust the concentration of ¹O₂ to improve the photocatalytic activity.