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Dually-crosslinked anion exchange membranes with PVDF semi-interpenetrating polymer network for improved electrodialysis desalination
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Type
Article
Citation
Xu, G., Wang, B., Xu, J., Ang, E. H., Liao, J., & Shen, J. (2024). Dually-crosslinked anion exchange membranes with PVDF semi-interpenetrating polymer network for improved electrodialysis desalination. Separation and Purification Technology, 350, Article 127844. https://doi.org/10.1016/j.seppur.2024.127844
Abstract
This study involves the development of a series of primary and secondary crosslinked anion exchange membranes (AEMs) within PVDF semi-interpenetrating networks, establishing a stable ion exchange structure. The optimal AEM, identified as DAEM-3, exhibits an ion exchange capacity (IEC) of 0.92 mmol·g−1, a solute diffusion rate of 0.0076 mmol/(cm2·h·mol/L). Remarkably, the desalination rate could reach 95.66 % within 180 min at a current density of 15 mA·cm−2, with the current efficiency of 81.12 %, surpassing the performance of the commercial membrane (AMX). Furthermore, the concentration rate reaches 17.00 % during a 390-minute process at a current density of 50 mA·cm−2, highlighting the ability of secondary cross-linking to simultaneously regulate IEC and the degree of cross-linking for improved densification and ion exchange performance. Moreover, the relatively tight cross-linked structure could be found to reduce water permeability and slow down the rate of spontaneous solute diffusion, making it a promising advancement in ED desalination and concentration technologies applied in zero liquid discharge.
Date Issued
2024
Publisher
Elsevier
Journal
Separation and Purification Technology
Grant ID
2021C03170
22008214
Funding Agency
Zhejiang Provincial Key Research and Development Program of China
National Natural Science Foundation of China