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使用CIMS离子交换膜分离Li+和[Bmim]+

作者：薛静怡，汪润慈，孟响，袁中伟，郑卫芳

单位：中国原子能科学研究院放射化学研究所，北京 102413

关键词： Li+离子; 1-丁基-3-甲基咪唑阳离子; 电渗析; 分离

DOI号： 10.16159/j.cnki.issn1007-8924.2025.02.006

分类号： TQ028

出版年,卷(期):页码： 2025,45(2):48-55

摘要：

吸收式热泵是一种能有效节能的制冷技术，而工质对是该技术发展的瓶颈之一。三元工质对如LiBr-[Bmim]Cl-H2O具有性能优势，使用CIMS离子交换膜可以有效且环保地分离Li+和[Bmim]+。为了研究CIMS膜的分离机理，本文通过Ferry-Faxen方程测量了CIMS膜的膜孔径，通过电渗析实验测量了两种离子在CIMS膜中的分配系数和扩散系数，以及CIMS膜在不同电流密度下的分离系数，并利用能斯特-普朗克方程讨论了这两种离子的电渗析分离过程。实验结果表明，[Bmim]+水合离子的空间尺寸接近或大于膜孔径，[Bmim]+离子与CIMS膜表面的磺酸基团有较强的相互作用。上述两个原因使得CIMS膜可以有效分离这两种离子。

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.

基金项目：

作者简介：

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

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