Synthesis And Photocatalytic Application Of Conjugated Microporous Polymers

Environmental pollution and energy shortage in contemporary world has become increasingly serious.As the abundant clean energy on the earth,sunlight can be used to generate clean and renewable energy,which is a potential feasible solution to solve the energy and environmental problems.In recent years,organic polymer semiconductors have become a promising new material for solar energy conversion due to its advantages of low cost,adjustable optics,electronics and structure properties.However,at present,there are many disadvantages in organic polymer semiconductor,such as low catalytic efficiency,poor cycling stability and poor utilization ability of long-wavelength photons.In this work,we first obtain a aza-fused ?-Conjugated Microporous Polymer(aza-CMP)by the condensation reaction between 1,2,4,5-phenylenetetramine and cyclohexanone monomers.The obtained aza-CMP shows a band gap ensuring that it can absorb visible light and near infrared photons.Further experiments showed that aza-CMP could effectively drive and catalyze the degradation of various organic dyes(Congo red,Rhodamine B and Methyl Orange)under visible and near-infrared light.Multiple cyclic catalysis experiments showed that aza-CMP had stable structure and performance in the catalytic process,that is,the structure and high catalytic activity of aza-CMP could be maintained after multiple cyclic degradation experiments.The results of this study provide a new idea and method for the application of conjugated polymer materials in the field of photocatalysis and further provide a reasonable way for the effective utilization of solar energy.Subsequently,we report an e fficient approach to synthesize Azo-Linked Polymer(ALP)through oxidative coupling reactions of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine,by using CuBr as catalyst,pyridine as co-catalysts.We prepared ALP that can reduce CO2 under visible light irradiation by optimizing the synthesis process,and the product yields rate were 0.18?mol h-1·g-1 for CO.The multiple cyclic catalytic experiments showed that the structure of ALP was very stable in the catalytic process,and its structure and high catalytic activity could be maintained after multiple light cycle experiments.This work provides a simpler and more effective method for the synthesis of azo-linked polymers.