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Issue 66, 2018, Issue in Progress
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A green sorbent for CO2 capture: α-cyclodextrin-based carbonate in DMSO solution

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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

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Publication details

The article was received on 27 Sep 2018, accepted on 26 Oct 2018 and first published on 09 Nov 2018


Article type: Paper
DOI: 10.1039/C8RA08040B
Citation: RSC Adv., 2018,8, 37757-37764
  • Open access: Creative Commons BY-NC license
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    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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