| Autor: |
Xu, Fang, Cao, Wanning, Li, Jinzhou, Zhi, Songsong, Gao, Zhiyong, Jiang, Yuqin, Li, Wei, Jiang, Kai, Wu, Dapeng |
| Zdroj: |
International Journal of Minerals, Metallurgy & Materials; Apr2023, Vol. 30 Issue 4, p630-641, 12p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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