Issue 15, 2024

Enhanced iodine capture by the hydrogen bond reconstruction strategy

Abstract

Radioactive iodine, existing in the resulting nuclear waste, represents a potential hazard to the environment and human beings. Therefore, efficient disposal methods for radioiodine are needed. Curcumin-based ionic liquids (CILs) could break the intramolecular hydrogen bond and form an intermolecular hydrogen-bonding interaction between cations and anions, making it easier to interact with molecules such as water. Hence, we prepared two types of CILs ([Emim][Cur] and [Bmim][Cur]), that could capture iodine. The capacities of [Emim][Cur] and [Bmim][Cur] are as high as 5.13 g g−1 and 5.14 g g−1, respectively, and the iodine amount in cyclohexane is up to 1463 mg g−1 and 1395 mg g−1 corresponding to [Emim][Cur] and [Bmim][Cur] after iodine capture for 12 hours. The presence of carbonyl, ether, and phenol hydroxyl groups induces charge transfer which leads to the formation of polyiodide anions, as revealed by FT-IR, Raman, and XPS spectra. The density functional theory (DFT) analysis further confirms that the high iodine capture capacity of [Emim][Cur] and [Bmim][Cur] stems from hydrogen bond reconstruction and the strong halogen bond between iodine and keto oxygen.

Graphical abstract: Enhanced iodine capture by the hydrogen bond reconstruction strategy

Supplementary files

Article information

Article type
Paper
Submitted
26 Jan 2024
Accepted
02 Mar 2024
First published
06 Mar 2024

J. Mater. Chem. A, 2024,12, 8747-8756

Enhanced iodine capture by the hydrogen bond reconstruction strategy

L. Gou, Y. Wang, S. Wang, J. Liu, X. Xin, X. Xu, S. Qin, L. He and G. Tao, J. Mater. Chem. A, 2024, 12, 8747 DOI: 10.1039/D4TA00592A

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