Preparation of heterojunction Al-PMOFs/CdZnS and photocatalytic oxidation of benzylamine
Porphyrin-based metal organic framework compound(Al-PMOFs)with cubic columnar crystal structure was synthesized from hydrothermal reaction of 5,10,15,20-(4-carboxyphenyl)porphyrin(TCPP)and AlCl3·6H2O.Then,heterojunction Al-PMOFs/CdZnS with good interfacial contact was obtained by depositing CdZnS nanoparticles on the surface of Al-PMOFs cubic columns via chemical coprecipitation,characterized by SEM,XPS,FTIR and UV-Vis adsorption spectroscopy,and analyzed on its photocatalytic activity for the photooxidative coupling reaction of benzylamine.The results showed that Al-PMOFs/CdZnS exhibited excellent photocatalytic activity and stability.The mechanism of photocatalytic reaction was discussed.Benzylamine was oxidized to form n-benzyl-1-phenylmethylimine(BPMI)when N,N-dimethylformamide(DMF)was used as solvent at room temperature,under irradiation of visible light for 7 h.The conversion rate of benzylamine reached 97%,and the selectivity of BPMI reached 99%.The improvement in photoactivity of Al-PMOFs/CdZnS was mainly attributed to the formation of Z-scheme heterojunction between Al-PMOFs and CdZnS,which could promote charge transfer at the interface of Al-PMOFs and CdZnS,and inhibit the recombination of Al-PMOFs/CdZnS surface photocarriers.
Al-PMOFsCdZnSvisible-light photocatalysisoxidative coupling reaction of benzylamineheterojunctioncatalysis technology
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