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Surface interactions of Cs+ and Co2+ with bentonite

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Abstract

Uptake of radioactive metal species from soils and solutions by clay particles could be a treatment option due to simplicity of operation and economic cost. In this concern, adsorption behavior of Cs+ or Co2+ onto bentonite as a function of contact time, pH, initial metal concentration, ionic strength, and temperature was studied by batch adsorption technique. Adsorption isotherm data were interpreted by Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models. Bentonite exhibited maximum adsorption capacity of 83.3 mg g−1 for Cs+ and 15.9 mg g−1 for Co2+. Presence of humic acid (HA) as a representative model of organic matter did not significantly affect the adsorption capacity of bentonite for Cs+, whereas it increased the adsorption capacity of bentonite for Co2+. Thermodynamic parameters, standard enthalpy (ΔH°), standard entropy (ΔS°), and standard free energy (ΔG°) were determined through batch adsorption experiments performed at four different temperatures of 288, 298, 318, and 338 K. Co2+ adsorption onto bentonite showed an endothermic reaction (ΔH° = 13.6 kJ mol−1) whereas Cs+ adsorption displayed an exothermic nature (ΔH° = −4.65 kJ mol−1). Negative values of ΔG° and positive values of ΔS° indicated the feasibility and spontaneous nature of adsorption processes and more disordered form after adsorption.

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Acknowledgments

Financial support provided by Turkish Atomic Energy Agency (TAEK) Project No: A3.H3.F5 is gratefully acknowledged.

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Correspondence to Omer Ozsoy.

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Responsible editor: Philippe Garrigues

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Ozsoy, O., Bekbolet, M. Surface interactions of Cs+ and Co2+ with bentonite. Environ Sci Pollut Res 25, 3020–3029 (2018). https://doi.org/10.1007/s11356-015-4103-9

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Keywords

  • Adsorption
  • Bentonite
  • Cesium
  • Cobalt
  • Adsorption isotherm modeling
  • Thermodynamic properties