1. Hydrogen bond-assisted construction of MOF/semiconductor heterojunction photocatalysts for highly efficient electron transfer.
- Author
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Dong, Pengyu, Gao, Kangjie, Zhang, Lihua, Huan, Hengke, Xie, Ming-Hua, Yang, Xiu-Li, and Zhang, Jinlong
- Subjects
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HETEROJUNCTIONS , *CHARGE exchange , *PHOTOCATALYSTS , *SEMICONDUCTORS , *PHOTOINDUCED electron transfer , *CHARGE transfer , *DENSITY functional theory - Abstract
It remains challenging for the fabrication of metal-organic framework (MOF)/semiconductor heterojunction photocatalysts with close contact interfaces. In this work, a novel MOF/semiconductor heterojunction photocatalyst consisting of H 2 O 2 -modified TiO 2 nanotubes (H 2 O 2 -TNTs) and MIL-88B(Fe)-NH 2 (labeled as H-T/M) was firstly constructed based on the hydrogen-bonded combination between the O atoms from –OOH groups resulting from H 2 O 2 absorbed on the surface of TiO 2 nanotubes and the H atoms of the –NH 2 group in MOF. The significantly enhanced photocatalytic property of the H-T/M heterojunction for reducing Cr(VI) could be ascribed to the accelerated interfacial electron transfer dynamics by a channel of hydrogen bonds (N···H–O–O–Ti), which could be extracted from the femtosecond transient absorption spectroscopy (fs-TAS). Moreover, the built-in electric field and the differences in charge density based on density functional theory (DFT) calculations could provide the driving force for charge transfer. [Display omitted] • MOF/semiconductor heterojunction photocatalyst was firstly constructed. • Hydrogen-bonded combination between the –OOH groups and the –NH 2 group in MOF. • The significantly enhanced photocatalytic property of the H-T/M heterojunction for reducing Cr(VI). • The built-in electric field could provide the driving force for charge transfer. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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