Design And Study Of Novel Hetero Junction Photocatalysis Of Perylene Diimide/Copper Phthalocyanine Derivatives

Photocatalysis,based on its application in environment cleaning,waste water treatment,and water photo-splitting,has gained increasing attention as a promising technique.Among these reported photocatalytic material systems,p-n heterojunction-type photoeatalysts shows high photocatalytic performance compared with corresponding p type or n type semiconductor materials due to its unique conduction bands and special electron transmission character suppress the carrier recombination by the built-in electric field.A revelation was given to us based on above view,that metal phthalocyanine/perylene diimide hydrogen bonding composite may be a promising materials to improve photocatalytic performance of MPcs.First,the photocatalytic mechanism of semiconductor materials and different photocatalytic systems was reviewed first.A detailed description was properties and applied in the photocatalysis field of phthalocyanine materials and perylene-diimide derivatives.Second,one-step synthesis of a series of the unsymmetrical N-pyridyl-N?-3,4,5-alkoxy phenyl perylene diimides(PDIs)with acceptable yield has been realized.The photophysical propertiescan be observed by UV-vis ?fluorescence spectra and 1H NMR absorption and emission spectra when the length of the alkoxy chains increased.Unsymmetrical PDIs containing the pyridyl easily form hydrogen bonds with PTA by-C-O-H…N intermolecular hydrogen bonding.The hydrogen bonds was studied by temperature and materials concentration.Third,A novel Copper phthalocyanine/perylene diimide derivatives p-n heterojunction photoeatalysts based on the intermolecular hydrogen bond between pyridyl and carboxyl was designed and characterized using FT-IR,UV-vis and photoluminescence spectra,and then their photocatalytic performance by degradation for rhodamine B(RhB)under visible light irradiation was compared.The hydrogen bond composites shows significant higher photocatalytic activity comparing with its parent,and the photocatalysis increased with increasing of mole fractron of perylene diimide derivatives.Furthermore,the photocatalytic mechanism was investigated the main reactive species for the degradation of RhB by radical scavengers testing.