Preparation And Photocatalytic Performance Of Highly Conjugated Organic Porous Polymers

Organic porous polymers connected by covalent bonds have many advantages such as high specific surface area,low density,high stability,and monomer molecule design,etc.,and show good application prospects in many fields,such as gas Storage and separation,luminescence,photocatalysis,light collection,energy storage,and heterogeneous catalysis.Especially for conjugated organic porous materials,the conjugated skeleton facilitates the transfer of electrons within the molecular framework.Especially its outstanding performance in photocatalysis has attracted more and more attention from researchers.This thesis mainly studies the design and synthesis of highly conjugated porous materials and their application in photocatalysis,and mainly includes the following parts:Chapter 1:A detailed overview of the development,classification,design principles,synthesis methods,application areas and progress of organic porous materials.According to the advantages of material structure,it is widely used in gas separation and storage,photoelectric conversion,heterogeneous catalysis and so on.Chapter 2:In this paper,two highly conjugated organic porous polymer materials with different triazine ring content were synthesized.These two materials combine a?-conjugated framework and a porous structured polymer.Compared with other non-?-conjugated porous materials or conventional non-porous 1D conjugated polymers,the?-conjugated framework and nanoporous characteristics The combination is conducive to the transfer of charges within the molecular framework,and CMPs exhibit excellent catalytic performance.The slight difference in the triazine ring content of the two materials shows a huge difference in the hydrogen production experiment.The HER of T-CMP-1 is 3214.3?mol h^-1 g^-1,while the HER of T-CMP-2is only 242.1?mol h^-1 g^-1.Chapter 3:Based on the Knoevenagel reaction,we designed and synthesized a fully conjugated organic porous polymer material.In order to increase the catalytic effect of the material,this paper selects monomers containing triazine ring and thiazole as the building blocks,and synthesized sp² Fully conjugated COFs materials connected by hybrid carbon atoms(-C=C-).The highly ordered pore arrangement structure improves the electron migration and diffusion,which is an ideal channel for separation.The material contains a fixed pore structure,high porosity,excellent chemical and physical stability and photoelectric performance and other key characteristics,showing excellent Photocatalytic activity and excellent reusability,HER is as high as 10535.714?mol h^-1 g^-1.In this thesis,using different chemical reactions,design and synthesis of functional monomer molecules based on triazine ring,and prepare several functionalized organic porous polymer materials.Through Fourier transform infrared(FT-IR)spectroscopy,powder X-ray diffraction(PXRD)analysis,solid ultraviolet,nuclear magnetism,thermogravimetric analysis spectroscopy(TGA),scanning and transmission electron microscopy,nitrogen adsorption(BET)testing,etc.The characterization means conduct in-depth research on the structure,morphology and functions of the synthesized monomer molecules and porous materials,and explore the reasons for the photocatalytic hydrogen evolution of these materials and the influence of the photocatalytic hydrogen evolution efficiency.