Preparation And Photocatalytic Properties Of Porphyrin Derivatives

Porphyrin and its derivatives are special photosensitizers whose unique photoelectric properties enable this photosensitizer to efficiently absorb visible light and are widely used in the field of photocatalysis.Porphyrins and their derivatives can be used as photocatalysts for photocatalytic degradation of organic wastewater.The self-assembly of porphyrin and its derivatives has unique photochemical and photophysical properties.By controlling the shape and size of nanocrystals through the principle of self-assembly,the photocatalytic properties of porphyrin and its derivatives can be further adjusted.Conjugated porous polymers（CPPs）are a new type of multifunctional photocatalysts.Their unique conjugated extended structures and band gaps can make CPPs materials exhibit strong ability to capture visible light.At the same time,CPPs materials are studied at the macro level,and the photocatalytic reaction efficiency of CPPs materials can also be improved by designing CPPs materials in terms of morphology,pore size,specific surface area,and functional groups.The results of the study are as follows:1.We synthesized 5,10,15,20-tetraphenylporphyrin（TPP）according to the Adler method and modified TPP to successfully synthesize 5-（4-amino）phenyl-10,15,20-triphenyl porphyrin（MAPP）.We synthesized 5,10,15,20-tetra（4-aminophenyl）porphyrin（TAPP）and its metal porphyrin derivative 5,10,15,20-tetra（4-aminophenyl）copper porphyrin（Cu TAPP）according to the Adler method.2.We carried out the reaction of MAPP with terephthalaldehyde and cyanuric chloride to form porphyrin-based polymers DP and TP.Based on the principle of self-assembly,three porphyrin derivatives including monomers are prepared into self-assembled SAM,SAD and SAT,and verified by various structural characterization methods.The photocatalytic degradation of Rh B by the above-mentioned porphyrin derivatives and their self-assemblies was investigated under visible light conditions.The photocatalyst SAT has good photocatalytic performance and cycling stability during the photocatalytic degradation process,and can still degrade 91%of Rh B after 5 catalytic degradation cycles.By studying the active substances produced by SAT in the photocatalytic process,it was found that the active substances involved in the photocatalytic degradation process included·OH,h⁺and·O₂^-,among them·O₂^-plays a major role.3.We synthesized 2,4,6-Tris（4-formylphenoxy）-1,3,5-triazine（FT）by Williamson etherification reaction.Two conjugated porous polymers,H₂TFT-CPP and Cu TFT-CPP,were synthesized by Schiff base reaction with FT as the linker and TAPP and Cu TAPP as the monomers,and verified by various structural characterization methods,which proved the successful synthesis of H₂TFT-CPP and Cu TFT-CPP.The adsorption properties of H₂TFT-CPP and Cu TFT-CPP for Rh B were investigated under dark conditions,among which,Cu TFT-CPP showed good adsorption and adsorption cycling stability.The photocatalytic degradation of Rh B by H₂TFT-CPP and Cu TFT-CPP was investigated under visible light conditions,and Cu TFT-CPP exhibited good photocatalytic degradation performance and photocatalytic cycling stability.By studying the active substances in the photocatalytic process of Cu TFT-CPP,it was found that the active substances involved in the photocatalytic degradation process included·OH,h⁺and·O₂^-,among them·O₂^-plays a major role.In addition,the active substances in the degradation process also include ¹O₂.