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Issue 3, 2014
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The ionic liquid [EMIM]OAc as a solvent to fabricate stable polybenzimidazole membranes for organic solvent nanofiltration

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Abstract

We have provided two feasible methods to prepare stable organic solvent nanofiltration (OSN) membranes by chemically cross-linking the polybenzimidazole (PBI) membranes fabricated from environmentally benign ionic liquids for the first time. A glutaraldehyde (GA)–water solution and a 1,2,7,8-diepoxyoctane (DEO)–n-heptane solution were employed to cross-link PBI membranes. The effects of these cross-linking agents on membrane stability and separation performance toward various solvents, including polar aprotic solvents, have been carefully examined. The GA cross-linking method, with little consumption of traditional organic solvents and energy, yielded a PBI membrane with a high and steady ethanol flux [3.69 L (m2 bar h)−1] and ethyl acetate flux [5.21 L (m2 bar h)−1]. Although PBI membranes cross-linked by DEO showed lower ethanol and ethyl acetate fluxes, they displayed impressive stability in aggressive solvents such as dimethyl sulfoxide (DMSO), N-methyl-2-pyrrolidinone (NMP) and N,N-dimethylacetamide (DMAc). Overall, PBI membranes cross-linked by both agents exhibited reasonable rejections which varied slightly from solvent to solvent due to different solute–solvent–membrane interactions. This study not only offers a new range of membrane materials and fabrication approaches for OSN, but will also enhance membrane-based green technology for the recovery of organic solvents.

Graphical abstract: The ionic liquid [EMIM]OAc as a solvent to fabricate stable polybenzimidazole membranes for organic solvent nanofiltration

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Article information


Submitted
11 Aug 2013
Accepted
25 Nov 2013
First published
26 Nov 2013

Green Chem., 2014,16, 1383-1392
Article type
Paper

The ionic liquid [EMIM]OAc as a solvent to fabricate stable polybenzimidazole membranes for organic solvent nanofiltration

D. Y. Xing, S. Y. Chan and T. Chung, Green Chem., 2014, 16, 1383
DOI: 10.1039/C3GC41634H

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