Photocatalytic oxidative desulfurization performance of phthalocyanine sensitized MIL-53(Al)
Composite MTcPc/MIL-53(Al)were prepared by loading carboxyl substituted metal phthalocyanines(MTcPc,M=Mn,Fe,Co,Ni,Cu,Zn)on the surface of metal-organic framework MIL-53(Al)via hydrothermal method,characterized by SEM,XRD,FTIR,UV-Vis absorption spectrum and XPS,and evaluated for its photocatalytic oxidation desulfurization performance on thiophene/n-octane simulated fuel at room temperature and atmospheric pressure with oxygen in air as oxidant.The results showed that MTcPc molecules were evenly dispersed on the surface of MIL-53(Al)in an ordered crystalline form,with their planar conjugated structure inducing the growth of MIL-53(Al)crystal in a specific direction.Compared with that of MTcPc,the Q band of MTcPc/MIL-53(Al)displayed a certain degree of redshift,resulting in the extension of optical response range.MnTcPc/MIL-53(Al)showed the best photocatalytic desulfurization performance.After 150 min of catalytic reaction,the conversion rate of thiophene reached 100％,and maintained at 93.01％after 4 cycles.The π-π accumulation between MTcPc and MIL-53(Al)improved the dispersion of MTcPc,and the respiration effect of MIL-53(Al)promoted the strong adsorption and enrichment of thiophene and oxygen molecules on MTcPc/MIL-53(Al)surface,which was beneficial to the formation of active intermediates MIL-53(Al)/MTcPc-1O2,thus improving the activity of oxidative desulfurization.The conjugated structure of MTcPc and the configuration of the central ion also exhibited strong influence on the efficiency of oxidative desulfurization.
metal phthalocyanineMIL-53(Al)hydrothermal methodphotocatalysisoxidative desulfurizationcatalytic technology
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维普
