Extended Donnan-Manning theory for selective ion partition and transport in ion exchange membrane
Extended Donnan-Manning theory for selective ion partition and transport in ion exchange membrane
复制标题
离子交换膜中选择性离子分配和传输的扩展唐南-曼宁理论
DOI：
10.1016/j.memsci.2023.121782
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发表时间：
2023
影响因子：
9.5
通讯作者：
Lin, Shihong
中科院分区：
文献类型：
--
作者：
Wang, Ruoyu;Duddu, Ravindra;Lin, Shihong
用于电化学离子-离子分离的离子交换膜（IEM）的使用通过价差和/或其他离子-膜相互作用利用IEM对带相同电荷的物质的选择性。文献中缺乏将选择性与膜的结构和化学性质联系起来的机理模型。在这里，我们扩展曼宁的反离子凝聚模型描述离子分配和离子迁移率内IEMS混合盐的情况。我们根据文献中的实验数据评估了扩展的唐南-曼宁模型，并将唐南-曼宁模型的性能与理想唐南模型和唐南-亲和力模型的性能进行了比较。我们的分析表明，尽管其结构的复杂性，Donnan-Manning模型具有较少的拟合参数比Donnan-Affinity模型，一般优于其他两个模型在预测反离子和共离子分配。在假设凝聚态离子迁移率高于非凝聚态离子迁移率的情况下，广义Manning模型也能预测阳离子交换膜的反离子迁移率选择性，但对阴离子交换膜的迁移率选择性的预测效果仍不理想。
The use of ion exchange membranes (IEMs) for electrochemical ion-ion separation leverages the selectivity of the IEMs toward like-charged species via valence difference and/or other ion-membrane interactions. A mechanistic model that relates selectivity with membrane structural and chemical properties is lacking in the literature. Here, we extend the Manning's counter-ion condensation model for describing ion partition and ion mobility inside IEMs to mixed salts scenarios. We evaluate the extended Donnan-Manning model against experimental data from literature and compare the performance of the Donnan-Manning model to that of the ideal Donnan model and the Donnan-Affinity model. Our analysis shows that, despite its structural complexity, the Donnan-Manning model has less fitting parameters than the Donnan-Affinity model and generally outperforms the two other models in predicting counter-ion and co-ion partition. With the assumption of a higher mobility of condensed ions than that of uncondensed ions, the generalized Manning's model can also predict counter-ion mobility selectivity for cation exchange membranes, but its performance for predicting mobility selectivity for anion exchange membranes is still unsatisfactory.