ZIF-8-Embedded Cation-Exchange Membranes with Improved Monovalent Ion Selectivity for Capacitive Deionization
Membrane capacitive deionization (MCDI) is an electrochemical ion separation process that combines ion-exchange membranes (IEMs) with porous carbon electrodes to enhance desalination efficiency and address the limitations of conventional capacitive deionization (CDI). In this study, a cation-exchang...
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MDPI AG
2025-01-01
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| author | Eui-Gyu Han Ji-Hyeon Lee Moon-Sung Kang |
| author_facet | Eui-Gyu Han Ji-Hyeon Lee Moon-Sung Kang |
| author_sort | Eui-Gyu Han |
| collection | DOAJ |
| description | Membrane capacitive deionization (MCDI) is an electrochemical ion separation process that combines ion-exchange membranes (IEMs) with porous carbon electrodes to enhance desalination efficiency and address the limitations of conventional capacitive deionization (CDI). In this study, a cation-exchange membrane (CEM) embedded with a metal–organic framework (MOF) was developed to effectively separate monovalent and multivalent cations in influent solutions via MCDI. To fabricate CEMs with high monovalent ion selectivity, ZIF-8 was incorporated into sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO) at various weight ratios. The resulting membranes were systematically characterized using diverse electrochemical methods. The ZIF-8-embedded CEMs demonstrated a sieving effect based on differences in ion size and hydration energy, achieving excellent permselectivity for monovalent ions. MCDI tests using the prepared CEMs showed a Na<sup>+</sup> ion removal rate exceeding 99% in Na<sup>+</sup>/Mg<sup>2+</sup> and Na<sup>+</sup>/Ca<sup>2+</sup> mixed feed solutions, outperforming a commercial membrane (CSE, Astom Corp., Tokyo, Japan), which achieved a removal rate of 94.1%. These findings are expected to provide valuable insights for advancing not only MCDI but also other electro-membrane processes capable of selectively separating specific ions. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Membranes |
| spelling | doaj-art-4c1a164c6a3246b6b1707e38004493b92025-01-24T13:41:02ZengMDPI AGMembranes2077-03752025-01-011511910.3390/membranes15010019ZIF-8-Embedded Cation-Exchange Membranes with Improved Monovalent Ion Selectivity for Capacitive DeionizationEui-Gyu Han0Ji-Hyeon Lee1Moon-Sung Kang2Department of Green Chemical Engineering, College of Engineering, Sangmyung University, Cheonan 31066, Republic of KoreaDepartment of Green Chemical Engineering, College of Engineering, Sangmyung University, Cheonan 31066, Republic of KoreaDepartment of Green Chemical Engineering, College of Engineering, Sangmyung University, Cheonan 31066, Republic of KoreaMembrane capacitive deionization (MCDI) is an electrochemical ion separation process that combines ion-exchange membranes (IEMs) with porous carbon electrodes to enhance desalination efficiency and address the limitations of conventional capacitive deionization (CDI). In this study, a cation-exchange membrane (CEM) embedded with a metal–organic framework (MOF) was developed to effectively separate monovalent and multivalent cations in influent solutions via MCDI. To fabricate CEMs with high monovalent ion selectivity, ZIF-8 was incorporated into sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO) at various weight ratios. The resulting membranes were systematically characterized using diverse electrochemical methods. The ZIF-8-embedded CEMs demonstrated a sieving effect based on differences in ion size and hydration energy, achieving excellent permselectivity for monovalent ions. MCDI tests using the prepared CEMs showed a Na<sup>+</sup> ion removal rate exceeding 99% in Na<sup>+</sup>/Mg<sup>2+</sup> and Na<sup>+</sup>/Ca<sup>2+</sup> mixed feed solutions, outperforming a commercial membrane (CSE, Astom Corp., Tokyo, Japan), which achieved a removal rate of 94.1%. These findings are expected to provide valuable insights for advancing not only MCDI but also other electro-membrane processes capable of selectively separating specific ions.https://www.mdpi.com/2077-0375/15/1/19membrane capacitive deionizationcation exchange membranemetal–organic frameworkZIF-8sieving effectpermselectivity for monovalent ions |
| spellingShingle | Eui-Gyu Han Ji-Hyeon Lee Moon-Sung Kang ZIF-8-Embedded Cation-Exchange Membranes with Improved Monovalent Ion Selectivity for Capacitive Deionization Membranes membrane capacitive deionization cation exchange membrane metal–organic framework ZIF-8 sieving effect permselectivity for monovalent ions |
| title | ZIF-8-Embedded Cation-Exchange Membranes with Improved Monovalent Ion Selectivity for Capacitive Deionization |
| title_full | ZIF-8-Embedded Cation-Exchange Membranes with Improved Monovalent Ion Selectivity for Capacitive Deionization |
| title_fullStr | ZIF-8-Embedded Cation-Exchange Membranes with Improved Monovalent Ion Selectivity for Capacitive Deionization |
| title_full_unstemmed | ZIF-8-Embedded Cation-Exchange Membranes with Improved Monovalent Ion Selectivity for Capacitive Deionization |
| title_short | ZIF-8-Embedded Cation-Exchange Membranes with Improved Monovalent Ion Selectivity for Capacitive Deionization |
| title_sort | zif 8 embedded cation exchange membranes with improved monovalent ion selectivity for capacitive deionization |
| topic | membrane capacitive deionization cation exchange membrane metal–organic framework ZIF-8 sieving effect permselectivity for monovalent ions |
| url | https://www.mdpi.com/2077-0375/15/1/19 |
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