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The effect of different exchangeable cations on the CO2 adsorption capacity of Laponite RD®
Published online by Cambridge University Press: 14 January 2025
Abstract
Tri-octahedral clay minerals have the potential to be used as CO2 sorbents at intermediate temperatures (200–400°C) owing to their thermal stability in this temperature range. In this study, Laponite RD®, a commercially synthesized hectorite (with Na+ as the exchangeable cation) was used to investigate its capacity of CO2 adsorption at 200°C and ambient pressure. Various cations such as Co2+, Ni2+, Mg2+ and Ca2+ were employed to exchange Na+, with the aim being to study their effects on the capacity for adsorbing CO2. The commercial sample showed an adsorption capacity of 144 µmolCO2 g–1. Most of the other exchanged samples displayed a lower quantity of CO2 adsorbed. An exception was the Ca2+-saturated sample, which exhibited a better performance (163 µmolCO2 g–1) compared with Laponite RD®. Thus, with its greater affinity towards CO2, such a sample could be a good candidate for CO2 capture. For all of the samples, most of the CO2 was desorbed, and the formation of carbonate bonds was not observed using Fourier-transform infrared spectroscopy, suggesting that the CO2 was mainly physisorbed.
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- © The Author(s), 2025. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.
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Nguyen et al. supplementary material
Nguyen et al. supplementary material
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