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Separation of lithium and [Bmim]+ ions by CIMS ion exchange membrane

Authors： XUE Jingyi, WANG Runci, MENG Xiang, YUAN Zhongwei, ZHENG Weifang

Units： Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China

KeyWords： lithium ion; 1-butyl-3-methylimidazolium cation; electrodialysis; separation

ClassificationCode：TQ028

year,volume(issue):pagination： 2025,45(2):48-55

Abstract：

Absorption heat pump is a refrigeration technology that can effectively save energy, and the working pair is one of the bottlenecks in the development of this technology. The ternary working pairs such as LiBr-[Bmim]Cl-H2O has some performance advantages, and the electrodialysis using CIMS membrane can separate Li+ and [Bmim]+ efficiently and environmentally friendly. In order to study the separating mechanism of CIMS membrane, this paper reported the membrane pore size of CIMS membrane by Ferry-Faxen equation, the selectivity and the diffusion coefficient of the two ions in CIMS membrane, and the permselectivity of CIMS membrane at different current densities through electrodialysis experiments and discussed the process of electrodialysis separation of the two ions using Nernst-Planck equation. The experimental results indicated that the spatial size of [Bmim]+ hydrated ion was close to or larger than the membrane pore size, and [Bmim]+ ion had a strong interaction with the sulfonic acid groups on the surface of the CIMS membrane. The two reasons above led to the effective separation of two ions by CIMS membrane.

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AuthorIntro：

薛静怡（1995-），女，甘肃灵台人，博士研究生，研究方向为核燃料循环与材料

Reference：

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