Synthesis And Properties Of Composite Materials Based On Covalent Organic Frameworks

Since it was first reported by Yaghi in 2005,covalent organic skeleton(COF)has attracted increasing attention due to its periodic skeleton structure,adjustable pore size and excellent chemical properties.In recent years,the synthesis method and performance of COFs have made remarkable progress.The structure and channel of COFs can be controlled by predesign,which can meet the specific synthesis goals and performance requirements.At present,many researchers have turned their attention to the design and synthesis of COFs composites.COFs composites have shown potential application value in many fields.In this paper,two COF@MOF composite materials were designed and synthesized,and the composite materials were characterized by X-ray powder diffraction and nuclear magnetic resonance spectroscopy.Meanwhile,the catalytic performance of composite materials was also studied.The main contents of this paper are as follows:1.The application of COF in various fields and the development of composite materials in recent years were listed.2.We have realized the transformation from amorphous material to crystalline material via the linker exchange strategy,and synthesized a new MOF@COF composite material(UIO-66-NH₂@COF-1).The successful recombination of COF-1 on UIO-66-NH₂ surface was confirmed by basic characterization methods.Meanwhile,the catalytic performance of UIO-66-NH₂@COF-1 was also studied.3.Palladium was loaded on the surface of UIO-66-NH₂ by simple infiltration method,and then COF-1 was grown on the MOF by amorphous to crystalline transformation method.This method effectively avoided the situation that the catalytic effect was greatly reduced due to metal aggregation and leaching in the catalytic process.4.We summarize the whole paper.The future of MOF@COF composites was prospected.