Synthesis of Carboxyphenyl Porphyrins and Photocatalytic Properties of Their Composites
Porphyrins have strong structural modifiability and visible light absorption ability,and are widely used in the design and research of novel photocatalysts and photosensitizers.However,the catalytic activity of porphyrins with different structures varies greatly,and the catalytic stability of porphyrins monomers is poor,so they cannot fully play the efficient photocatalytic activity.In order to explore the intrinsic reasons for the difference in photocatalytic activity of porphyrins and enhance the stability of porphyrins in the photocatalytic process,three kinds of carboxyl porphyrins with different molecular structures TCPP,TmCPP and H8OCPP were synthesized.The results showed that H8OCPP exhibited the highest photocatalytic water splitting activity with the hydrogen evolution rate of 4 111 μmol·g-1·h-1.In addition,by utilizing the electrostatic interaction between amine and carboxyl groups,g-C3N4 and TDPP were loaded onto the surface of H8OCPP,significantly boosting the photocatalytic stability of carboxyl porphyrin.The increase in the number of strong polar carboxyl groups is beneficial for the separation of photogenerated hole-electron pairs of porphyrin molecules,leading to improve the photocatalytic hydrogen production performance.The introduction of amine group modified molecules enhances the stability and catalytic activity of carboxyl porphyrin in the photocatalytic reaction system.
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