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Carbon nanotubes wrapped phthalocyanine: enhanced oxidative desulfurization for dibenzothiophene in fuel

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Abstract

A series of binuclear metallophthalocyanines (M2Pc2(CP)4, M = Fe2+, Co2+, and Zn2+) were synthesized and wrapped on the surface of multi-walled carbon nanotubes (MWCNTs) by a facile “in situ hydrothermal” to improve the desulfurization performance. The morphological characteristics and chemical environment of the MWCNTs/M2Pc2(CP)4 composites were characterized by FTIR, SEM, XRD, UV–vis, and XPS. The results showed that M2Pc2(CP)4 complexes were supported on the surface of the MWCNTs with strong π-π supramolecular interaction and the sizes of the composites were mainly distributed in the range of 300 to 500 nm. The oxidative desulfurization activity of the MWCNTs/M2Pc2(CP)4 composites was investigated using a bio-inspired catalytic system taking molecular O2 as an economical and environmentally friendly oxidizer. The MWCNTs/M2Pc2(CP)4 composites exhibited significant activity for ultra-deep removal of dibenzothiophene (DBT) from the model fuel. The conversion rate of DBT was 96.95%, which was 41% higher than that of the pure CNT. A bio-inspired catalytic reaction mechanism is proposed. The desulfurization activity of the MWCNTs/M2Pc2(CP)4 composites can be recycled for five times without a significant decrease. The results indicated that M2Pc2(CP)4 drastically improved the photocatalytic performance of CNT.

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Acknowledgements

We gratefully acknowledge financial support of this work by the National Natural Science Foundation of China (No. 21501139) and the Natural Science Foundation of Shaanxi Province (No. 2020JM-563).

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Correspondence to Min Tian or Gai Zhang.

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Tian, M., He, Y. & Zhang, G. Carbon nanotubes wrapped phthalocyanine: enhanced oxidative desulfurization for dibenzothiophene in fuel. J Nanopart Res 23, 223 (2021). https://doi.org/10.1007/s11051-021-05339-6

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  • DOI: https://doi.org/10.1007/s11051-021-05339-6

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