Ti3C2 Mxene/Ag3VO4异质结催化剂的构建及其光催化还原CO2性能研究OA

Traditional photocatalytic CO2 reduction systems typically require a large amount of substantial sacrificial agents to facilitate the reduction process.How to design efficient and stable catalysts to achieve a photocatalytic reaction without sacrificial agents has always been a research hotspot in this field.A series of novel Schottky heterojunction photocatalysts Ti3C2/Ag3VO4(TAx,x=m(Ag3VO4)/m(Ti3C2))were prepared by physical mixing method.Their structural properties were characterized by XRD,SEM and TEM,etc.,and their photocatalytic CO2 reduction performance and mechanism were systematically studied.The results show that Ag3VO4 nanoparticles are uniformly dispersed onto the surface of Ti3C2 nanosheets,forming an intimate interfacial structure.Under sacrificial-agent-free conditions and visible light irradiation(λ≥420 nm)for 3 h,TA1.5 exhibits the best photocatalytic CO2 reduction performance.The yields of CO and CH4 reach 80.67 μmol/g and 33.67 μmol/g,respectively.The yield of CO of TA1.5 is approximately 18.5 times and 17.2 times higher than that of Ti3C2 and Ag3VO4,respectively.The Schottky barrier formed between Ti3C2 and Ag3VO4 effectively promotes the directional migration of photogenerated electrons from Ag3VO4 to Ti3C2,thereby suppressing charge carrier recombination and significantly enhancing the photocatalytic CO2 reduction performance.