Cl-Based Functional Group Modification Mil-53(Fe) as Efficient Photocatalysts for Degradation of Tetracycline Hydrochloride
As the most common iron-based MOF, MIL-53(Fe) has been widely narrated to be used to treat emerging pollutants in water. However, the limited number of electrons has always restrained the rate at which Fe3+ can be reduced to Fe2+. We propose for the first time that different numbers of chlorine functional groups were introduced into the iron-based metal framework MIL-53(Fe) to improve its photo-Fenton degradation performance of tetracycline hydrochloride (TCH). The characterization results confirmed that the 2Cl-MIL-53(Fe) exhibited optimal photoelectric properties while maintaining the original structural characteristics. The reaction rate constant of 2Cl-MIL-53(Fe) in TCH photo-Fenton degradation was 3.8 times of the MIL-53(Fe) with outstanding pH tolerance (2.6-11.8) and recyclability. The results of first-principles based theoretical calculation verified that the performance improvement was ascribed to the chlorine functional group modification. The introduction of the chlorine functional group reduced the band gap width of the MOF and enhanced the visible light absorptive capacity of MIL-53(Fe). The significantly enhanced electron cloud density of the Fe−O clusters promoted the cycle of Fe3+/Fe2+ and boosted the activity of Fe−O clusters. This work provides a new strategy for iron-based MOF as a heterogeneous photo-Fenton catalyst to degrade pollutants in water
Year of publication: |
[2022]
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Authors: | Wang, Xingyue ; Ma, Yuhan ; Jiang, Jingjing ; Li, Mingyu ; Li, Chaoqun ; Li, Tianren ; Dong, Shuangshi |
Publisher: |
[S.l.] : SSRN |
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