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Effect of acid activation on the CO2 adsorption capacity of montmorillonite

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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.

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  1. National Institute of Applied Science and Technology (INSAT), Carthage University, Tunis, Tunisia

    Nouha Horri

  2. National Center for Research in Materials Science, Technopole of Borj Cedria, Tunis, Tunisia

    Nouha Horri, Najoua Frini-Srasra & Ezzeddine Srasra

  3. Department of Chemical, Energy, and Mechanical Technology, ESCET, Universidad Rey Juan Carlos, Madrid, Spain

    Eloy S. Sanz-Pérez & Amaya Arencibia

  4. Department of Chemical and Environmental Technology, ESCET, Universidad Rey Juan Carlos, Madrid, Spain

    Raul Sanz

  5. Faculty of Sciences of Tunis (FST), Manar University, Tunis, Tunisia

    Najoua Frini-Srasra

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Horri, N., Sanz-Pérez, E.S., Arencibia, A. et al. Effect of acid activation on the CO2 adsorption capacity of montmorillonite. Adsorption 26, 793–811 (2020). https://doi.org/10.1007/s10450-020-00200-z

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