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Residence Times of Nanoconfined CO2 in Layered Aluminosilicates

Abstract

Nanoconfinement of CO2 in layered aluminosilicates contributes to the capture and release of this greenhouse gas in soils. In this work, we show that residence times of CO2 in montmorillonite are lowered by 15 min for each 1°C increment in temperature during venting. Molecular simulations showed that activation energies of release are about half of the value of the experimentally-derived value of 34 kJ/mol. This raised the possibility of additional processes limiting CO2 mobility in real materials, including (chemi)sorption at reactive sites or frayed edges or defects. Residence times (~1616 min at -50 °C to ~6 min at 60 °C) for the some of the driest (~1.4 mmole H2O/g) montmorillonites that can be produced under ambient temperatures are readily lowered by inclusion of additional water. They are, in turn, prolonged again as water content and interlayer spacing become smaller through venting. These efforts showed that soil-building clay minerals will lose they propensity to dynamically exchange CO2 as temperatures continue to rise, yet they may retain CO2 more efficiently in cold seasons as soils will become depleted in moisture content.

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Publication details

The article was received on 16 Oct 2018, accepted on 02 Nov 2018 and first published on 05 Nov 2018


Article type: Paper
DOI: 10.1039/C8EN01156G
Citation: Environ. Sci.: Nano, 2018, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Residence Times of Nanoconfined CO2 in Layered Aluminosilicates

    M. Yeşilbaş, M. Holmboe and J. Boily, Environ. Sci.: Nano, 2018, Accepted Manuscript , DOI: 10.1039/C8EN01156G

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