Issue 66, 2018, Issue in Progress

A green sorbent for CO2 capture: α-cyclodextrin-based carbonate in DMSO solution

Abstract

Cyclodextrin (α-CD)/KOH pellet dissolved in DMSO was utilized to capture CO2. KOH has a dual function of enhancing the nucleophilicity of the hydroxyl groups on the α-CD rims and acting as a desiccant. 13C NMR spectroscopy provided evidence for the chemisorption of CO2 through the formation of organic carbonate (RO-CO2·K+). This was supported by the spectral changes obtained using ex situ ATR-FTIR spectroscopy upon bubbling CO2. Activation of α-CD with NaH or bubbling with 13CO2 verified that chemisorption occurred solely via RO-CO2·K+ rather than inorganic bicarbonate. Volumetric gas uptake demonstrated a sorption capacity of 21.3 wt% (4.84 mmol g−1). To the best of our knowledge, this is the highest chemisorption value reported to date for CD-based sorbents. DFT calculations of the Gibbs free energies indicated that the formation of RO-CO2·K+ was more favoured at the primary carbinol rather than its secondary counterpart.

Graphical abstract: A green sorbent for CO2 capture: α-cyclodextrin-based carbonate in DMSO solution

Supplementary files

Article information

Article type
Paper
Submitted
27 Sep 2018
Accepted
26 Oct 2018
First published
09 Nov 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 37757-37764

A green sorbent for CO2 capture: α-cyclodextrin-based carbonate in DMSO solution

A. F. Eftaiha, A. K. Qaroush, F. Alsoubani, T. M. Pehl, C. Troll, B. Rieger, B. A. Al-Maythalony and K. I. Assaf, RSC Adv., 2018, 8, 37757 DOI: 10.1039/C8RA08040B

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