A new class of porous materials for efficient CO2 separation: Ionic liquid/graphene aerogel composites

نویسندگان

چکیده

Here, we report a new post-synthesis modification strategy for functionalizing reduced graphene aerogels (rGAs) towards an exceptional CO2 separation performance. 1-N-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) was impregnated on rGA, prepared by reducing GA at 700 °C, various ionic liquid (IL) loadings of 5, 10, 30, and 50 wt%. The resulting composites were characterized in deep detail X-ray photoelectron spectroscopy, diffraction, N2 physical adsorption measurements, scanning electron microscopy, Fourier transform infrared Raman spectroscopies, thermogravimetric analysis. Results indicated the presence interactions between rGA surface anion IL, potentially improving affinity. Volumetric gas measurements using these materials showed that deposition [BMIM][PF6] IL loading wt% boosts CO2/CH4 selectivity more than 20-times, exceeding absolute value 120, remarkably higher compared to other functionalized under similar operating conditions. Tunability both structure characteristics offer tremendous degree flexibility rational design IL/rGA high performance applications.

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ژورنال

عنوان ژورنال: Carbon

سال: 2021

ISSN: ['0008-6223', '1873-3891']

DOI: https://doi.org/10.1016/j.carbon.2020.08.079