Connecting the Ion Separation Factor to the Sorption and Diffusion Selectivity of Ion Exchange Membranes,Industrial & Engineering Chemistry Research

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Connecting the Ion Separation Factor to the Sorption and Diffusion Selectivity of Ion Exchange Membranes
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-16 , DOI: 10.1021/acs.iecr.0c02457
Hongxi Luo ₁ , Wendy-Angela Saringi Agata ₁ , Geoffrey M. Geise ₁

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To optimize the productivity of ion exchange membranes used in electric field-driven ion separation processes, an understanding of the relationship between membrane structure–property metrics and a measure of ion separation is necessary. The membrane separation factor is a commonly used indicator of ion separation efficacy, and as outlined in this review, it can be related to the intrinsic sorption and diffusion selectivity properties of the membrane. Doing so connects the separation factor to key theories that describe ion transport, and this connection facilitates an analysis of the implications of these theories on electric field-driven ion separations. The process of electrodialysis and ion exchange membranes can be applied for both desalination and ion separation applications, and this review discusses relationships between commonly used metrics for electric field-driven transport (e.g., transport number) and properties commonly used in desalination contexts (e.g., sorption and diffusivity selectivity). These relationships provide context for commonly observed experimental trends. Additionally, some common assumptions (and their implications for describing membrane transport properties related to a multicomponent ED system) are discussed. This review also links fundamental membrane properties (such as sorption and diffusivity selectivity) to ion separation-critical properties (such as the ion exchange affinity). While the diffusivity selectivity may be more important at lower current density values, the sorption selectivity is expected to be important across a wider range of current density values. This review further highlights the interconnected manner by which ion exchange membrane properties and external process conditions couple to influence ion separation performance.

中文翻译：

将离子分离因子与离子交换膜的吸附和扩散选择性联系起来

为了优化在电场驱动的离子分离过程中使用的离子交换膜的生产率，必须了解膜结构-性能指标与离子分离度之间的关系。膜分离因子是离子分离效率的常用指标，如本综述所述，它可能与膜的固有吸附和扩散选择性有关。这样做会将分离因子与描述离子迁移的关键理论联系起来，这种联系有助于分析这些理论对电场驱动的离子分离的影响。电渗析和离子交换膜的过程可用于脱盐和离子分离应用，这篇综述讨论了电场驱动传输的常用度量（例如，传输数）与淡化环境中常用的属性（例如，吸附和扩散选择性）之间的关系。这些关系为通常观察到的实验趋势提供了背景。此外，讨论了一些常见的假设（及其对描述与多组分ED系统相关的膜传输特性的影响）。这篇综述还将膜的基本性能（如吸附和扩散选择性）与离子分离的关键性能（如离子交换亲和力）联系起来。尽管在较低的电流密度值下扩散率选择性可能更为重要，但在更大的电流密度值范围内，吸附选择性仍很重要。

更新日期：2020-08-12

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