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A green sorbent for CO2 capture: α-cyclodextrin-based carbonate in DMSO solution
Ala'a F Eftaiha1, Abdussalam K Qaroush2, Fatima Alsoubani1
1Department of Chemistry, The Hashemite University P. O. Box 150459 Zarqa 13115 Jordan alaa.eftaiha@hu.edu.jo.
RSC Advances
|May 13, 2022
Summary
Cyclodextrin (α-CD)/KOH pellets effectively capture CO2 via chemisorption, achieving a record 21.3 wt% sorption capacity. This novel method offers a promising solution for carbon capture technologies.
Area of Science:
- Materials Science
- Chemistry
- Environmental Science
Background:
- Carbon dioxide (CO2) capture is crucial for mitigating climate change.
- Cyclodextrins (CDs) are explored as potential sorbent materials.
- Developing efficient and cost-effective CO2 capture methods remains a challenge.
Purpose of the Study:
- To investigate the CO2 capture capabilities of cyclodextrin (α-CD)/KOH pellets.
- To elucidate the mechanism of CO2 chemisorption by α-CD/KOH.
- To determine the sorption capacity of the developed material.
Main Methods:
- Preparation of α-CD/KOH pellets in DMSO.
- Characterization using 13C NMR and ex situ ATR-FTIR spectroscopy.
- Gas uptake measurements and DFT calculations.
Main Results:
- Evidence of CO2 chemisorption forming organic carbonate (RO-CO2-·K+) confirmed by spectroscopy.
- Highest reported chemisorption capacity for CD-based sorbents: 21.3 wt% (4.84 mmol g-1).
- DFT calculations indicated preferential binding at the primary carbinol site.
Conclusions:
- α-CD/KOH pellets demonstrate high efficiency for CO2 chemisorption.
- The material exhibits superior performance compared to existing CD-based sorbents.
- This study presents a promising advancement in carbon capture material development.
