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Issue 47, 2019
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Monomolecular VB2-doped MOFs for photocatalytic oxidation with enhanced stability, recyclability and selectivity

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Abstract

Monomolecular VB2 (vitamin B2) was doped into UiO-66 [Zr6O4(OH)4(BDC)12, BDC = 1,4-benzenedicarboxylic acid] via chemical bonds and the obtained VB2@UiO-66 could be used as a heterogeneous photocatalyst. The coordination with UiO-66 was found to be able to positively shift the conduction band of VB2, which thermodynamically precluded the formation of other reactive oxygen species (like O2˙) except 1O2 under visible light irradiation and led to 1O2 as the only reactive oxygen species for VB2@UiO-66. This result was totally different from that for VB2, which produced various reactive oxygen species, such as O2˙ and 1O2. Due to the fact that 1O2 was the only reactive oxygen species, VB2@UiO-66 displayed excellent photocatalytic selectivity (∼100%) towards benzyl alcohol oxidation. At the same time, chemical bonding with UiO-66 greatly improved the stability of VB2 under visible light. After 5 cycles, the conversion was still 91% and the selectivity was close to 100%. This work offers not only a solution to the poor recyclability, stability and selectivity of VB2 as a photocatalyst but also a new efficient strategy to extend the photocatalytic applications of MOFs by immobilizing common biological antioxidants on their particular sites.

Graphical abstract: Monomolecular VB2-doped MOFs for photocatalytic oxidation with enhanced stability, recyclability and selectivity

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Supplementary files

Article information


Submitted
30 Aug 2019
Accepted
05 Nov 2019
First published
07 Nov 2019

J. Mater. Chem. A, 2019,7, 26934-26943
Article type
Paper

Monomolecular VB2-doped MOFs for photocatalytic oxidation with enhanced stability, recyclability and selectivity

R. Zhang, X. Song, Y. Liu, P. Wang, Z. Wang, Z. Zheng, Y. Dai and B. Huang, J. Mater. Chem. A, 2019, 7, 26934 DOI: 10.1039/C9TA09571C

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