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- Title
Effect of acid activation on the CO2 adsorption capacity of montmorillonite.
- Authors
Horri, Nouha; Sanz-Pérez, Eloy S.; Arencibia, Amaya; Sanz, Raul; Frini-Srasra, Najoua; Srasra, Ezzeddine
- Abstract
Montmorillonite, a natural and abundant clay, was subjected to acid treatments in HCl solutions for different times to enhance its physicochemical properties for CO2 adsorption. Acid activated montmorillonites were characterized by elemental analysis, XRD, FTIR, nitrogen physisorption, TGA, and NMR to evaluate the physicochemical changes due to the acid treatment. Besides, these samples were examined as CO2 adsorbents, evaluating the influence of the modified textural characteristics on the affinity of montmorillonite towards CO2 capture. After 3 h of acid treatment, the specific surface area of clay increased from 39 to 202 m2/g, while the pore volume increased from 0.05 to 0.31 cm3/g. CO2 adsorption isotherms were carried out at 0, 15, and 30 °C, showing that acid activated clays were much more efficient for CO2 adsorption than raw materials. Further studies on the CO2 adsorption process were performed: experimental equilibrium data were correlated by using Langmuir, Freundlich, and Sips models, and the isosteric heat of adsorption was calculated from the Clausius–Clapeyron equation.
- Publication
Adsorption, 2020, Vol 26, Issue 5, p793
- ISSN
0929-5607
- Publication type
Article
- DOI
10.1007/s10450-020-00200-z