Junbin Liao , Tongtong Wang , Yifan Xu , Qishun Zhang , Yuanyuan Tang , Junjie Mu , Edison Huixiang Ang , Yuyang Yao , Yanqing Xu , Jiangnan Shen
{"title":"双功能侧链装饰扭曲的聚(芳基醚砜)骨架,使阴离子交换膜对氯离子具有高选择性","authors":"Junbin Liao , Tongtong Wang , Yifan Xu , Qishun Zhang , Yuanyuan Tang , Junjie Mu , Edison Huixiang Ang , Yuyang Yao , Yanqing Xu , Jiangnan Shen","doi":"10.1016/j.memsci.2024.122970","DOIUrl":null,"url":null,"abstract":"<div><p>Mono-valent selective ion-exchange membrane, as the core component of selective electrodialysis (SED), has received extensive attention. In this work, we report a mono-valent selective anion-exchange membrane (AEM), which was fabricated with distorted poly(aryl ether sulfone) and decorated with bifunctional side-chains providing anion exchange groups and hydrophobic segments. By tuning the length of the hydrophobic side-chains, the nanophase separation within AEMs was finely tuned, evidenced by an ionic cluster size of about 0.47 nm from SAXS analysis. The optimized AEM (PAES-TA-7 AEM) shows a very low water swelling ratio of 6.4 %, signaling good dimensional stability. The perm-selectivity (<span><math><mrow><msubsup><mi>P</mi><msubsup><mrow><mi>S</mi><mi>O</mi></mrow><mn>4</mn><mrow><mn>2</mn><mo>–</mo></mrow></msubsup><msup><mrow><mi>C</mi><mi>l</mi></mrow><mo>–</mo></msup></msubsup></mrow></math></span>) of PAES-TA-7 AEM during ED reached 107 at 2.5 mA∙cm<sup>−2</sup> (ion flux: 2.69 × 10<sup>−8</sup> mol cm<sup>−2</sup> s<sup>−1</sup> at 90 min) significantly exceeding that of the commercial Neosepta ACS (11; 2.08 × 10<sup>−8</sup> mol cm<sup>−2</sup> s<sup>−1</sup>). It is inferred that the ion channels, resulting from nanophase separation between the side-chains and the backbone, as well as the free volume cavity created by the distorted backbone, significantly contribute to the smooth transport of the Cl<sup>−</sup> ions through the AEM with less resistance. As a result, it is believed that this work offers a useful strategy to advance the monovalent anion-selective membranes.</p></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":null,"pages":null},"PeriodicalIF":8.4000,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Bifunctional side-chains decorating a distorted poly(aryl ether sulfone) backbone to endow an anion exchange membrane with high perm-selectivity for chloride ions\",\"authors\":\"Junbin Liao , Tongtong Wang , Yifan Xu , Qishun Zhang , Yuanyuan Tang , Junjie Mu , Edison Huixiang Ang , Yuyang Yao , Yanqing Xu , Jiangnan Shen\",\"doi\":\"10.1016/j.memsci.2024.122970\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Mono-valent selective ion-exchange membrane, as the core component of selective electrodialysis (SED), has received extensive attention. In this work, we report a mono-valent selective anion-exchange membrane (AEM), which was fabricated with distorted poly(aryl ether sulfone) and decorated with bifunctional side-chains providing anion exchange groups and hydrophobic segments. By tuning the length of the hydrophobic side-chains, the nanophase separation within AEMs was finely tuned, evidenced by an ionic cluster size of about 0.47 nm from SAXS analysis. The optimized AEM (PAES-TA-7 AEM) shows a very low water swelling ratio of 6.4 %, signaling good dimensional stability. The perm-selectivity (<span><math><mrow><msubsup><mi>P</mi><msubsup><mrow><mi>S</mi><mi>O</mi></mrow><mn>4</mn><mrow><mn>2</mn><mo>–</mo></mrow></msubsup><msup><mrow><mi>C</mi><mi>l</mi></mrow><mo>–</mo></msup></msubsup></mrow></math></span>) of PAES-TA-7 AEM during ED reached 107 at 2.5 mA∙cm<sup>−2</sup> (ion flux: 2.69 × 10<sup>−8</sup> mol cm<sup>−2</sup> s<sup>−1</sup> at 90 min) significantly exceeding that of the commercial Neosepta ACS (11; 2.08 × 10<sup>−8</sup> mol cm<sup>−2</sup> s<sup>−1</sup>). It is inferred that the ion channels, resulting from nanophase separation between the side-chains and the backbone, as well as the free volume cavity created by the distorted backbone, significantly contribute to the smooth transport of the Cl<sup>−</sup> ions through the AEM with less resistance. As a result, it is believed that this work offers a useful strategy to advance the monovalent anion-selective membranes.</p></div>\",\"PeriodicalId\":368,\"journal\":{\"name\":\"Journal of Membrane Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":8.4000,\"publicationDate\":\"2024-06-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Membrane Science\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0376738824005647\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Membrane Science","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0376738824005647","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Bifunctional side-chains decorating a distorted poly(aryl ether sulfone) backbone to endow an anion exchange membrane with high perm-selectivity for chloride ions
Mono-valent selective ion-exchange membrane, as the core component of selective electrodialysis (SED), has received extensive attention. In this work, we report a mono-valent selective anion-exchange membrane (AEM), which was fabricated with distorted poly(aryl ether sulfone) and decorated with bifunctional side-chains providing anion exchange groups and hydrophobic segments. By tuning the length of the hydrophobic side-chains, the nanophase separation within AEMs was finely tuned, evidenced by an ionic cluster size of about 0.47 nm from SAXS analysis. The optimized AEM (PAES-TA-7 AEM) shows a very low water swelling ratio of 6.4 %, signaling good dimensional stability. The perm-selectivity () of PAES-TA-7 AEM during ED reached 107 at 2.5 mA∙cm−2 (ion flux: 2.69 × 10−8 mol cm−2 s−1 at 90 min) significantly exceeding that of the commercial Neosepta ACS (11; 2.08 × 10−8 mol cm−2 s−1). It is inferred that the ion channels, resulting from nanophase separation between the side-chains and the backbone, as well as the free volume cavity created by the distorted backbone, significantly contribute to the smooth transport of the Cl− ions through the AEM with less resistance. As a result, it is believed that this work offers a useful strategy to advance the monovalent anion-selective membranes.
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.