Preparation And Application Of Photocatalytic Composite Materials Based On Covalent Triazine-based Frameworks

With the continuous development of urbanization and the rapid development of social industrialization,the problem of environmental pollution has become increasingly prominent,which seriously affects the survival and development of human beings,especially the problem of water pollution.Recently,scientists have made a lot of efforts to solve the problem of water pollution,and photocatalytic technology has been proved to be a method to deal with water pollution.In recent years,the rapid development of covalent organic framework has attracted people's attention.This new type of material plays an increasingly obvious role in the field of catalysis.At present,many articles on covalent organic framework have been reported.Some of these articles focus on triazine covalent framework(CTFs).Triazine covalent framework(CTFs)is a porous,crystalline organic framework with triazine ring.It was first reported that it can adsorb hydrogen,but it was later discovered that by adjusting the conditions of synthesis.Triazine covalent organic frameworks for photocatalytic hydrogen production is presented in 2017.Although the band structure of triazine covalent organic framework accords with the condition of photocatalytic degradation of organic pollutants,as far as we know,there is no literature to mention that triazine covalent organic framework can degrade organic pollutant,which gives us inspiration.we try to use triazine covalent organic framework for photocatalytic degradation of organic pollutants.The results show that Rhodamine B can be degraded by triazine covalent framework photocatalysis,which broadens the application range of triazine covalent organic framework.Although Rhodamine B can be degraded by triazine covalent framework photocatalysis,the photocatalytic degradation of Rhodamine B is very poor.we constructed triazine covalent organic frame composites to improve the photocatalytic degradation of rhodamine B by triazine covalent organic frames.Because bismuth molybdate is an excellent non-toxic and easy-to-obtain photocatalyst,and Rhodamine B can be degraded by it,we introduce bismuth molybdate into the system of triazine covalent organic framework.Bismuth molybdate was grown over triazine covalent organic framework by solvothermal method.We have made a series of characterizations to prove that the composite materials are triazine covalent organic frame and bismuth molybdate composite.The experimental results show that the photocatalytic degradation of rhodamine B by bismuth molybdate triazine organic frame composites is greatly improved.We are surprised to find that the addition of triazine covalent organic framework to the synthesis of bismuth molybdate can effectively change the morphology of bismuth molybdate.Thus,the photocatalytic degradation of rhodamine B by bismuth molybdate triazine covalent organic frame composites is enhanced.In combination with the relevant literature,the hypothetical conjecture of how triazine covalent organic framework affects the morphology of bismuth molybdate is given.This hypothesis is also the focus and difficulty of our future work.