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Shi X, Xiao H, Lackner KS, et al. Capture CO2 from Ambient Air Using Nanoconfined Ion Hydration. Angew Chem Int Ed Engl. 2016;55(12):4026-9doi: 10.1002/anie.201507846.
Shi, X., Xiao, H., Lackner, K. S., & Chen, X. (2016). Capture CO2 from Ambient Air Using Nanoconfined Ion Hydration. Angewandte Chemie (International ed. in English), 55(12), 4026-9. https://doi.org/10.1002/anie.201507846
Shi, Xiaoyang, et al. "Capture CO2 from Ambient Air Using Nanoconfined Ion Hydration." Angewandte Chemie (International ed. in English) vol. 55,12 (2016): 4026-9. doi: https://doi.org/10.1002/anie.201507846
Shi X, Xiao H, Lackner KS, Chen X. Capture CO2 from Ambient Air Using Nanoconfined Ion Hydration. Angew Chem Int Ed Engl. 2016 Mar 14;55(12):4026-9. doi: 10.1002/anie.201507846. Epub 2016 Feb 23. PMID: 26914978.
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Angew Chem Int Ed Engl. 2016 Mar 14;55(12):4026-9. doi: 10.1002/anie.201507846. Epub 2016 Feb 23.

Capture CO2 from Ambient Air Using Nanoconfined Ion Hydration.

Angewandte Chemie (International ed. in English)

Xiaoyang Shi, Hang Xiao, Klaus S Lackner, Xi Chen

Affiliations

  1. Department of Earth and Environmental Engineering, Columbia University, 905E Mudd, 500 West 120th Street, New York, NY, 10027, USA.
  2. School of Sustainable Engineering & Built Environment, Arizona State University, Tempe, AZ, 85287-9309, USA.
  3. Department of Earth and Environmental Engineering, Columbia University, 905E Mudd, 500 West 120th Street, New York, NY, 10027, USA. [email protected].

PMID: 26914978 DOI: 10.1002/anie.201507846

Abstract

Water confined in nanoscopic pores is essential in determining the energetics of many physical and chemical systems. Herein, we report a recently discovered unconventional, reversible chemical reaction driven by water quantities in nanopores. The reduction of the number of water molecules present in the pore space promotes the hydrolysis of CO3(2-) to HCO3(-) and OH(-). This phenomenon led to a nano-structured CO2 sorbent that binds CO2 spontaneously in ambient air when the surrounding is dry, while releasing it when exposed to moisture. The underlying mechanism is elucidated theoretically by computational modeling and verified by experiments. The free energy of CO3 (2-) hydrolysis in nanopores reduces with a decrease of water availability. This promotes the formation of OH(-), which has a high affinity to CO2 . The effect is not limited to carbonate/bicarbonate, but is extendable to a series of ions. Humidity-driven sorption opens a new approach to gas separation technology.

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: CO2 capture; air-water interfaces; free energy; ion hydration; molecular dynamics

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