Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 468, Issue -, Pages 73-80Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2014.05.044
Keywords
Mesoporous carbon membranes; Supported ionic liquid membranes (SILMs); Gas separation; Carbon dioxide; 1-Alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division
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Free-standing mesoporous carbon-graphitic carbon nanocomposite membranes with controllable pore size (7.3-11.3 nm) were synthesized by the brick-and-mortar method, carbon black (CB) as bricks and soft-templated phenolic resin-based mesoporous carbon (MC) as the mortar. Immobilization of imidazolium-based room temperature ionic liquids ([C(n)mim][Tf2N], n=2, 4, and 6) in the MC-CB membranes produced a series of supported ionic liquid membranes (SILMs) that are permselective for separation of CO2-N-2 gas pair. Strong capillary forces resulting from the well-developed mesoporosity of the MC CB membranes greatly enhanced the stability of the supported ionic liquids. This enabled the SILMs to operate under transmembrane pressures as high as 1000 kPa without degrading their separation performance. This makes it possible to apply SILMs to high-pressure CO2 capture and separation processes, where high transmembrane pressure would greatly increase the permeate flux through the membranes. (C) 2014 Elsevier B.V. All rights reserved.
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