Issue 15, 2024

The enrichment of 7Li by extraction with a Sudan I-Ionic liquid system

Abstract

Lithium isotopes with high abundances (6Li and 7Li) are crucial for the advancement of nuclear energy. In order to achieve the effective separation of 7Li, a Sudan I-[HMIm][BF4]-anisole extraction system was built employing Sudan I (1-benzeneazo-2-naphthol) as the extractant and hydrophobic ionic liquid [HMIm][BF4] as the co-extractant. By optimizing the organic and aqueous phase components, the extraction rate of the system could reach up to 26.30%, and the single-stage separation factor of the system could reach 1.015 ± 0.001. Meanwhile, the mechanism of the extraction process was investigated, and it was found that the ratio of Sudan I to lithium ions is 1 : 1, and the thermodynamic enthalpy change of the extraction process was less than zero (ΔH < 0), indicating that the extraction process of the system was an exothermic process. The construction of the Sudan-ionic liquid extraction separation system provides a new idea for the study of 7Li enrichment and separation and also provides a possibility for the industrialization of high-abundance 7Li enrichment.

Graphical abstract: The enrichment of 7Li by extraction with a Sudan I-Ionic liquid system

Article information

Article type
Paper
Submitted
21 Oct 2023
Accepted
02 Jan 2024
First published
05 Mar 2024

New J. Chem., 2024,48, 6562-6570

The enrichment of 7Li by extraction with a Sudan I-Ionic liquid system

H. Li, J. Sun, Y. Jia, P. Zhang, H. Ju, L. Mao, Z. Zhao, X. Li, B. Li, Y. Jing and F. Shao, New J. Chem., 2024, 48, 6562 DOI: 10.1039/D3NJ04888H

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