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Nafion membranes modified by cationic cyclodextrin derivatives for enantioselective separation
•Nafion117® membranes modified by three cationic cyclodextrin derivatives.•The modified membranes were tested in chiral separation of a model racemic mixture.•Membranes investigation on enantioselective separation - pertraction, sorptions, and pressure-driven membrane separation.•The enantiomeric ex...
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Published in: | Separation and purification technology 2021-07, Vol.266, p.118538, Article 118538 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | •Nafion117® membranes modified by three cationic cyclodextrin derivatives.•The modified membranes were tested in chiral separation of a model racemic mixture.•Membranes investigation on enantioselective separation - pertraction, sorptions, and pressure-driven membrane separation.•The enantiomeric excess as high as 44% was reached in sorption process.•The pressure-driven approach has allowed the operation to be continuous and faster.
Nafion117® membranes modified by three cationic cyclodextrin (CD) derivatives have been prepared by strong ionic bonding. All CD derivatives contained bis(methylimidazolium) (MIM2) cationic anchor covalently bound to the CD unit, either using no spacer or using diethylene glycol (DEG) or tetraethylene glycol (TEEG) spacers. The modified membranes were tested in chiral separation of a model racemic mixture (d/l-tryptophan) from water. Different experimental set-ups for characterising membranes in enantioselective separation – pertraction, two kinds of sorption, and pressure-driven membrane separation – have been described and rigorously compared. The membranes CD-MIM2, CD-DEG-MIM2 have reached the highest enantiomeric excess, 14 and 44% respectively, in 280 days. The lowest performance of the CD-TEEG-MIM2 membrane, with the long spacer, has been visibly ameliorated by applying pertraction; enantiomeric excess rose from 2 to 27% in 80 days. Even though sorption played the main role in pertraction, this process substantially enhanced the separation of racemic mixtures. The pressure-driven approach has allowed the operation to be continuous and faster, which has the potential for continuous large-scale production of enantiopure compounds and could pave the way for many more commercial applications, satisfying the considerable demand for large-scale chiral separation techniques. |
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ISSN: | 1383-5866 1873-3794 |
DOI: | 10.1016/j.seppur.2021.118538 |