TiO<sub>2</sub>@NH<sub>2</sub>-MIL-125(Ti) composite derived from a partial-etching strategy with enhanced carriers’ transfer for the rapid photocatalytic Cr(VI) reduction

Fang Xu; Wanning Cao; Jinzhou Li; Songsong Zhi; Zhiyong Gao; Yuqin Jiang; Wei Li; Kai Jiang; Dapeng Wu

doi:10.1007/s12613-022-2559-4

Volume 30 Issue 4

Apr. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(4): 630-641

Fang Xu, Wanning Cao, Jinzhou Li, Songsong Zhi, Zhiyong Gao, Yuqin Jiang, Wei Li, Kai Jiang, and Dapeng Wu, TiO₂@NH₂-MIL-125(Ti) composite derived from a partial-etching strategy with enhanced carriers’ transfer for the rapid photocatalytic Cr(VI) reduction, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 630-641. https://doi.org/10.1007/s12613-022-2559-4

Cite this article as:

Fang Xu, Wanning Cao, Jinzhou Li, Songsong Zhi, Zhiyong Gao, Yuqin Jiang, Wei Li, Kai Jiang, and Dapeng Wu, TiO2@NH2-MIL-125(Ti) composite derived from a partial-etching strategy with enhanced carriers’ transfer for the rapid photocatalytic Cr(VI) reduction, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 630-641. https://doi.org/10.1007/s12613-022-2559-4

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Research Article

TiO₂@NH₂-MIL-125(Ti) composite derived from a partial-etching strategy with enhanced carriers’ transfer for the rapid photocatalytic Cr(VI) reduction

+ Author Affiliations

Corresponding authors:
Yuqin Jiang E-mail: jiangyuqin@htu.cn

Dapeng Wu E-mail: dapengwu@htu.edu.cn
Received: 28 July 2022; Revised: 26 September 2022; Accepted: 4 October 2022; Available online: 6 October 2022

Abstract

Abstract

Metal-organic frameworks (MOFs)-based composites have been widely applied as photocatalysts because of their synergistic effect between the two individual component. Herein, TiO₂@NH₂-MIL-125(Ti) nanocomposites which possess unsaturated titanium–oxo clusters, mesoporous structure, and intimate interface were successfully constructed via an in-situ distilled water-etched route. The X-ray photoelectron spectroscopy (XPS) measurements indicated strong electronic interaction between TiO₂ and NH₂-MIL-125(Ti), confirming the formation of TiO₂@NH₂-MIL-125(Ti) nanocomposite. Photoelectrochemical and thermodynamics measurements showed that TiO₂@NH₂-MIL-125(Ti) nanocomposites have improved charge separation efficient and decreased transfer resistance of the carriers within the heterojunction interfaces, which facilitates the photoexcited electrons transfer and reduction of the Cr(VI) species. Therefore, the optimal TiO₂@NH₂-MIL-125(Ti) nanocomposite demonstrated superior performance compared to NH₂-MIL-125(Ti) and NH₂-MIL-125(Ti) derived TiO₂. Based on the free radical trapping experiment and electron paramagnetic resonance (EPR) measurements, a possible type-II scheme was proposed for the enhanced photocatalytic activity over the TiO₂@NH₂-MIL-125(Ti) nanocomposite.
- NH₂-MIL-125;
- titanium dioxide;
- distilled water-etched route;
- photocatalysis;
- hexavalent chromium reduction

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