Preparation And Properties Of Photocatalytic Materials Based On Porphyrin Supramolecular Assembly

Porphyrins with the planar aromatic macrocyclic structure,as the center of the photosynthetic reaction in nature,possess wide light absorption range and are widely studied in photocatalysis.Using intermolecular non-covalent bond interactions of porphyrins for self-assembly to form ordered aggregates can effectively improve the photocatalytic efficiency.However,most porphyrin aggregates are large in size,nonuniform in morphology,low in photocatalytic activity,unstable,difficult recycling,and metal-containing porphyrins,which introduce metal contamination.In response to the above problems,with the assistation of surfactants different selfassembled aggregates of metal-free porphyrin(TCPP)were formed,through the acidbase neutralization and the two-solvent mixing methods,which effectively control its morphology.In the presence of CTAB,the photocatalytic degradation activity of TCPP self-assembly to phenol under visible light was 8.5 times higher than that of untreated TCPP powder.The CTAB-TCPP nanorod aggregates were 2.6 times more active than the fiber aggregates formed by mixing the two solvents.In order to further improve the photocatalytic activity of the TCPP aggregates and the problem of recovery,the pure organic heterostructure composite(TCPP/PDINH)of ordered TCPP aggregates and organic semiconductor 3,4,9,10-perylene tetramethylene diimide(PDINH)aggregates was constructed by co-assembly.Under visible light,the degradation activity of TCPP/PDINH to phenol was significantly improved.The matching band positions of the two aggregates and the intermolecular ?-? stacking and hydrogen bonding lead to a close contact interface,which promotes the formation of Ztype structure and improves the photogenerated charge separation efficiency.In addition,the use of two-dimensional PDINH aggregates as support substrates improves the stability of TCPP aggregates and increases the macroscopic size of TCPP/PDINH composite catalysts,which is beneficial to their recycling.Figure 46;Table 3;Reference 115...