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Environmental Science and Pollution Research

, Volume 26, Issue 10, pp 10398–10413 | Cite as

Organo-modification of montmorillonite for enhancing the adsorption efficiency of cobalt radionuclides from aqueous solutions

  • Mohamed A. Soliman
  • Ghada M. Rashad
  • Mamdoh R. MahmoudEmail author
Research Article
  • 74 Downloads

Abstract

Montmorillonite clay was organically modified with thoron (TH) and was employed as an adsorbent for removal of cobalt(II) radionuclides from aqueous solutions. Batch adsorption experiments, under several operational parameters such as pH, contact time, initial adsorbate concentration, adsorbent dosage, ionic strength, and temperature, were conducted to determine the optimum conditions for efficient removal of cobalt(II) radionuclides. The obtained data showed that almost complete removals were achieved for cobalt(II) at pH values ≥ 3.5 using TH-modified montmorillonite (TMM), while only 63% were obtained by unmodified clay at pH ≥ 5.4. Adsorption kinetic data of cobalt(II) were better fitted by the pseudo-second order kinetic model and its adsorption rate was controlled by film diffusion. Both Langmuir and Freundlich models had the ability to well describe the equilibrium data of cobalt(II) radionuclides at the studied temperatures. The adsorption capacity of TMM (0.85 mmol/g) was found to be not only nine times that of unmodified montmorillonite (0.097 mmol/g), but also higher than those reported in literature using various unmodified and modified clays. Thermodynamic parameters (ΔH°, ΔS°, and ΔG°) were calculated. Among the examined desorbing agents, both Al3+ and EDTA were succeeded to desorb most of cobalt(II) radionuclides (desorption % ~ 90%) loaded onto TMM. The results of this study clarified that TMM can be considered as an effective adsorbent for removal of cobalt(II) radionuclides from aqueous solutions.

Keywords

Montmorillonite Thoron Cobalt Radionuclide Organo-clay Adsorption 

Notes

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Mohamed A. Soliman
    • 1
  • Ghada M. Rashad
    • 2
  • Mamdoh R. Mahmoud
    • 2
    Email author
  1. 1.Egypt Second Research ReactorAtomic Energy AuthorityCairoEgypt
  2. 2.Nuclear Chemistry Department, Hot Laboratories CenterAtomic Energy AuthorityCairoEgypt

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