New Methodology for Characterizing Ion Permeability and Selectivity of Ion-Exchange Membranes

IF 8.8 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Junwei Zhang, Amit N. Shocron, Victoria Meola, Camille Violet, Zhongren Jiao, Paloma I. Lenz, Yanghua Duan, Ruoyu Wang, Arpita Iddya and Menachem Elimelech*, 
{"title":"New Methodology for Characterizing Ion Permeability and Selectivity of Ion-Exchange Membranes","authors":"Junwei Zhang,&nbsp;Amit N. Shocron,&nbsp;Victoria Meola,&nbsp;Camille Violet,&nbsp;Zhongren Jiao,&nbsp;Paloma I. Lenz,&nbsp;Yanghua Duan,&nbsp;Ruoyu Wang,&nbsp;Arpita Iddya and Menachem Elimelech*,&nbsp;","doi":"10.1021/acs.estlett.5c00597","DOIUrl":null,"url":null,"abstract":"<p >Ion-exchange membranes (IEMs) are critical to electrochemical ion-separation technologies for environmental and energy applications. Although advancements in separation performance have been frequently reported, significant challenges in evaluating mixed-salt IEM performance under electro-driven conditions remain largely overlooked. Here, we present a new method for the rapid and standardized characterization of ion transport properties for IEMs in mixed-salt systems. Using a modified Goldman-Hodgkin-Katz equation, we demonstrate that individual ion permeability can be obtained from IEM conductance measurements with mixed-salt linear sweep voltammetry experiments. Under low-current conditions, the ion permeability ratio can be converted into different metrics for quantification of ion–ion selectivity including current-based and flux-based selectivity. Our findings also reveal substantial differences between ion transport properties of IEMs under single-salt and mixed-salt conditions, highlighting the critical role of competing ions in transport experiments. Overall, this new approach provides an efficient framework to evaluate IEM performance in environmentally relevant conditions, facilitating cross-membrane performance comparison and establishing the foundation to elucidate the structure-property-performance relationships for IEMs in mixed-salt systems.</p>","PeriodicalId":37,"journal":{"name":"Environmental Science & Technology Letters Environ.","volume":"12 8","pages":"1082–1088"},"PeriodicalIF":8.8000,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Science & Technology Letters Environ.","FirstCategoryId":"1","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.estlett.5c00597","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0

Abstract

Ion-exchange membranes (IEMs) are critical to electrochemical ion-separation technologies for environmental and energy applications. Although advancements in separation performance have been frequently reported, significant challenges in evaluating mixed-salt IEM performance under electro-driven conditions remain largely overlooked. Here, we present a new method for the rapid and standardized characterization of ion transport properties for IEMs in mixed-salt systems. Using a modified Goldman-Hodgkin-Katz equation, we demonstrate that individual ion permeability can be obtained from IEM conductance measurements with mixed-salt linear sweep voltammetry experiments. Under low-current conditions, the ion permeability ratio can be converted into different metrics for quantification of ion–ion selectivity including current-based and flux-based selectivity. Our findings also reveal substantial differences between ion transport properties of IEMs under single-salt and mixed-salt conditions, highlighting the critical role of competing ions in transport experiments. Overall, this new approach provides an efficient framework to evaluate IEM performance in environmentally relevant conditions, facilitating cross-membrane performance comparison and establishing the foundation to elucidate the structure-property-performance relationships for IEMs in mixed-salt systems.

Abstract Image

表征离子交换膜离子渗透性和选择性的新方法
离子交换膜(IEMs)是用于环境和能源的电化学离子分离技术的关键。尽管人们经常报道分离性能的进步,但在电驱动条件下评估混合盐IEM性能的重大挑战在很大程度上被忽视了。在这里,我们提出了一种快速和标准化表征混合盐体系中IEMs离子传输特性的新方法。利用改进的Goldman-Hodgkin-Katz方程,我们证明了混合盐线性扫描伏安实验可以从IEM电导测量中获得单个离子的渗透率。在低电流条件下,离子渗透率可以转换成不同的指标来量化离子选择性,包括基于电流的选择性和基于通量的选择性。我们的研究结果还揭示了单盐和混合盐条件下IEMs离子输运特性的实质性差异,突出了竞争离子在输运实验中的关键作用。总的来说,这种新方法提供了一个有效的框架来评估环境相关条件下的IEM性能,促进跨膜性能比较,并为阐明混合盐体系中IEM的结构-性能-性能关系奠定基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Environmental Science & Technology Letters Environ.
Environmental Science & Technology Letters Environ. ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES
CiteScore
17.90
自引率
3.70%
发文量
163
期刊介绍: Environmental Science & Technology Letters serves as an international forum for brief communications on experimental or theoretical results of exceptional timeliness in all aspects of environmental science, both pure and applied. Published as soon as accepted, these communications are summarized in monthly issues. Additionally, the journal features short reviews on emerging topics in environmental science and technology.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信