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Surface modification induced enhanced CO<inf>2</inf>sorption in cucurbit[6]uril, an organic porous material

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Open access via publisher
Authors
Mohan, M.
Suzuki, T.
Nair, A.
Pillai, S.
Warrier, K.
Hareesh, U.
Nair, Balagopal
Gale, Julian
Date
2017
Type
Journal Article

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Mohan, M. and Suzuki, T. and Nair, A. and Pillai, S. and Warrier, K. and Hareesh, U. and Nair, B. et al. 2017. Surface modification induced enhanced CO<inf>2</inf>sorption in cucurbit[6]uril, an organic porous material. Physical Chemistry Chemical Physics. 19 (37): pp. 25564-25573.
Source Title
Physical Chemistry Chemical Physics
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Nanochemistry Research Institute
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Abstract

© 2017 the Owner Societies. The CO 2 adsorption properties of an organic macrocycle, cucurbit[6]uril (CB[6] ), have been evaluated through experimental and theoretical studies. Quantum mechanical calculations show that CB[6] is capable of adsorbing the CO 2 molecule selectively within its cavity relative to nitrogen. Adsorption experiments at 298 K and at 1 bar pressure gave a CO 2 adsorption value of 1.23 mmol g -1 for the unmodified material. Significant enhancements in the CO 2 adsorption capacity of the material were experimentally demonstrated through surface modification using physical and chemical methods. Ethanolamine (EA) modified CB[6] provided an excellent sorption selectivity value of 121.4 for CO 2 /N 2 at 323 K and is unique with respect to its discrimination potential between CO 2 and N 2 . The chemical nature of the interaction between CO 2 and amine is shown to be the primary mechanism for the enhanced CO 2 absorption performance.