1. Monomolecular VB2-doped MOFs for photocatalytic oxidation with enhanced stability, recyclability and selectivity.
- Author
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Zhang, Ruoqian, Song, Xinhua, Liu, Yuanyuan, Wang, Peng, Wang, Zeyan, Zheng, Zhaoke, Dai, Ying, and Huang, Baibiao
- Abstract
Monomolecular VB
2 (vitamin B2 ) was doped into UiO-66 [Zr6 O4 (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 ˙− ) except1 O2 under visible light irradiation and led to1 O2 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 ˙− and1 O2 . Due to the fact that1 O2 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. [ABSTRACT FROM AUTHOR]- Published
- 2019
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