Interface Regulation Of Bi₂S₃/MOF Heterojunction And Study On The Mechanism Of Carrier Conduction Rate Enhancement

With the increasingly serious for environmental pollution and energy crisis,the conversion and utilization of clean renewable energy are of high significance.Photocatalytic technology has gained considerable attention,which are the efficient way to convert solar energy into chemical energy.It is worth noting that the design of high-efficiency visible light catalytic materials is the key to photocatalytic technology.Bi₂S₃materials have attracted extensive attention due to the high light absorption and narrow band gap.But the problems of photoelectron-hole recombination and interfacial conduction efficiency limit the application in photocatalysis.In this paper,we select MOFs of matching energy level,and build new Bi₂S₃/MOFs heterostructure after modification.It aims to improve the conduction of carriers by accelerating the interface charge transfer between materials,which can improve the efficiency of visible light catalysis.The details are summerized as follows:（1）The organic coupling interface is constructed with NH₂-UiO-66 as a matrix at room temperature,and Bi₂S₃nanoparticles are grown on the surface of MOFs by a simple precipitation method to obtain Bi₂S₃/NH₂-UiO-66-S heterostructure.Under the simulated visible light source,the photocatalytic activity of the heterostructure has been significantly improved.This indicates that the interface regulation of the heterostructure can improve the tightness of the interface between Bi₂S₃and MOFs,which can realize the formation of more stable core-shell structure.It will help accelerate the conduction of photogenerated carriers and reduce the effect of components shedding during the catalytic process on the catalytic efficiency.（2）The organic coupling interface is constructed with NH₂-MIL-125 as the matrix at room temperature.And the Bi₂S₃/NH₂-MIL-125-S heterostructure is constructed by the method of"ultrasonic synthesis+hydrothermal crystallization".Under the simulated visible light source,due to the synergy between the two components,the photocatalytic activity of the heterostructure is significantly enhanced.As a result of the formation of a more stable heterogeneous interface for the heterostructure,the rapid transfer of interface charges can be realized to improve the conduction rate of carriers.