Zhao, Y. and Li, Y. and Zhu, J. and Lejarazu-Larrañaga, A. and Yuan, S. and Ortega, E. and Shen, J. and Gao, C. and Van der Bruggen, B. (2019) Thin and robust organic solvent cation exchange membranes for ion separation. Journal of Materials Chemistry A, 7. pp. 13903-13909. ISSN 2050-7488
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Abstract
A thin and robust organic solvent cation exchange membrane (CEM) was successfully established for the first time using dissolved Kevlar aramid nanofibers as the casting solution and 4-aminobenzenesulfonic acid (ABS) as the negatively charged functional group via amide condensation reaction. The synthesized Kevlar CEMs reconciled the advantages of Kevlar aramid nanofibers, achieving an excellent ion exchange capacity as high as 1.0 mmol•g-1 (with 22.5% water content), a low swelling rate of ~2.0%, a low membrane surface electric resistance of 2.95 Ω•cm2, a high mechanical strength of over 9.0 kPa of water column (the membrane thickness was 5.0 μm) and a high membrane limiting current density of 45.0 mA•cm-2 (in 0.1 M NaCl solution). In electrodialysis, the Kevlar CEMs demonstrated an exceptional cation/anion separation in dilute and concentrated cells. After 72 h of immersion in aqueous acetone solutions (25%, 50%, 75% and 100%, Vacetone/Vwater), the resulting membranes still exhibited a significant separation in ED. The work demonstrates a promising potential application for Kevlar aramid nanofibers in the preparation of organic solvent CEMs.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Chemistry |
| Depositing User: | Users 646 not found. |
| Date Deposited: | 19 Jul 2019 10:32 |
| Last Modified: | 19 Sep 2019 10:19 |
| URI: | http://eprints.imdea-agua.org:13000/id/eprint/1066 |
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