Surface modification induced enhanced CO<inf>2</inf>sorption in cucurbituril, an organic porous material
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Â© 2017 the Owner Societies. The CO 2 adsorption properties of an organic macrocycle, cucurbituril (CB ), have been evaluated through experimental and theoretical studies. Quantum mechanical calculations show that CB 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 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.
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