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Adsorption of La, Eu and Lu on raw and modified red clay

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Abstract

Adsorption of La, Eu, and Lu on red clay was studied in an initial concentration range of 10−4–10−3 mol/dm3 and a pH range of 2–10. Among the different forms of red clay: T-clay (thermally modified), R-clay (raw, unmodified), Na-clay (sodium form), H-clay (acid form), and HDTMA-clay (surfactant-modified form), T-clay was found to be the most effective adsorbent of the lanthanides studied. The adsorption/desorption isotherms, i.e. log K d versus log c eq dependencies, had a linear character. Among the investigated lanthanides, Eu was most strongly bound by the clay surface and, therefore, parameters a (slopes of the lines log K d = alog c eq + b) of Eu were the highest compared to those for La and Lu. Desorption isotherms were located above adsorption isotherms, which resulted from chemiadsorption of the investigated lanthanides. Changes in lanthanide adsorption with pH were successfully modelled based on the molar fractions of Ln3+, LnOH2+, LnCO3 +, and Ln(CO3) −2 species in the aqueous phase [Ln—lanthanide(III)].

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Acknowledgments

This work was financially supported by a grant from the National Centre of Research and Development of Poland “Technologies Supporting Development of Safe Nuclear Power Engineering”. Agreement No. 168/040-117/2011.

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  1. Faculty of Chemistry, Maria Curie-Skłodowska University, Pl. MC Skłodowskiej 2, 20-031, Lublin, Poland

    Agnieszka Gładysz-Płaska, Marek Majdan & Ewelina Grabias

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  1. Agnieszka Gładysz-Płaska
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  2. Marek Majdan
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  3. Ewelina Grabias
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Correspondence to Agnieszka Gładysz-Płaska.

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Gładysz-Płaska, A., Majdan, M. & Grabias, E. Adsorption of La, Eu and Lu on raw and modified red clay. J Radioanal Nucl Chem 301, 33–40 (2014). https://doi.org/10.1007/s10967-014-3111-4

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  • DOI: https://doi.org/10.1007/s10967-014-3111-4

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