Journal
AICHE JOURNAL
Volume 68, Issue 1, Pages -Publisher
WILEY
DOI: 10.1002/aic.17397
Keywords
chromium (VI); crosslinking; electrodialysis; polymer inclusion membrane (PIM); transport mechanism
Categories
Funding
- National Natural Science Foundation of China [21706141, 21878319, 51708542, 51761145107]
- QIBEBT and Dalian National Laboratory for Clean Energy, CAS [DICPQIBEBT UN201809]
- Shandong Provincial Key Science and Technology Program [2018CXGC1005, 2019JZZY010511]
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This study demonstrated significant improvement in Cr(VI) transport by employing cross-linked PIMs with different base polymers in PIM-electrodialysis processes. The cross-linked PIMs showed higher hydrophilicity and lower membrane area resistance, supporting ions transport in a continuous pathway at low current density. This research provides insights into mechanism understanding and further improvement of efficient ion transport in PIM-ED systems.
Electric field intensification has been demonstrated as an effective strategy for facilitating ion transfer and separation in polymer inclusion membrane (PIM) involved processes. However, it is still a challenge to develop compatible PIMs with high performance and to reveal the underlying mechanisms. Herein, crosslinked PIMs with different base polymers have been employed in PIM-electrodialysis processes. Cross-linked cellulose triacetate (CTA) based PIMs exhibited significant improvement in Cr(VI) transport, which permeability coefficient was 5.9 times larger than the non-cross-linked counterpart. The characterizations of cross-linked PIMs showed higher hydrophilicity and lower membrane area resistance. Furthermore, cross-linked polymeric network inside CTA based PIMs structure increased their crystallinity, thus supporting the fixed-site jumping mechanism, thereby enabling ions to be transported directly in a manner of continuous pathway at low current density. This study shed light on further improvement of efficient ion transport and gave insights into the mechanism understanding in PIM-ED systems.
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