Issue 44, 2015

Ionic liquid functionalization – an effective way to tune carbon dioxide adsorption properties of carbon nanotubes

Abstract

In this research, the influence of non-covalent functionalization by ionic liquids on carbon dioxide (CO2) adsorption–desorption properties of multi-walled carbon nanotubes (MWNTs) and partially exfoliated MWNTs (PEMWNTs) has been studied. In addition, the effect of polymerization of the ionic liquid on CO2 adsorption–desorption properties has also been studied at low pressures (<100 kPa) and at different temperatures. The thermodynamic parameters were also determined. It was found that ionic liquid functionalization significantly improved the adsorption capacity through weak CO2 complex formation with the substituted nitrogen of the imidazolium cation. Furthermore, the adsorption isotherm analysis suggested that the residual functional groups were more affine compared to the ionic liquid moieties. The heat of adsorption behaves differently upon polymerization of the ionic liquid on both substrates. The influence of polymerization on the entropy change was much more significant with the MWNTs substrate, whereas it was negligible with PEMWNTs.

Graphical abstract: Ionic liquid functionalization – an effective way to tune carbon dioxide adsorption properties of carbon nanotubes

Article information

Article type
Paper
Submitted
04 Feb 2015
Accepted
30 Mar 2015
First published
31 Mar 2015

RSC Adv., 2015,5, 35098-35106

Ionic liquid functionalization – an effective way to tune carbon dioxide adsorption properties of carbon nanotubes

P. Tamilarasan and S. Ramaprabhu, RSC Adv., 2015, 5, 35098 DOI: 10.1039/C5RA02159F

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