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Study of Fe(III) adsorption onto Dowex-Marathon resin, as a rate determining step of the U(IV) oxidation in 235U enrichment column

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Abstract

The Fe(III) adsorption onto Dowex-Marathon resin was well described by pseudo-second order kinetics with a high correlation factor for all the experimental concentrations. The results were analyzed by Langmuir, Freundlich and Dubinin–Radushkevich isotherm models. The activation energy E a (7.96 ± 0.2 kJ/mol) indicates a physisorption process as in the case of U(VI) adsorption onto the same resin. The thermodynamic parameters: ∆G° = (−7.91) ÷ (−13.68) kJ/mol, ∆H° = 35.60 ± 0.89 kJ/mol and ∆S° = 143.31 ± 3.58 J/mol K, were determined, the Fe(III) adsorption being spontaneous and endothermic.

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Authors and Affiliations

  1. National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat Str., 400293, Cluj-Napoca, Romania

    Cristina Marcu, Damian Axente & Ancuţa Balla

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  1. Cristina Marcu
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  2. Damian Axente
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  3. Ancuţa Balla
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Correspondence to Cristina Marcu.

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Marcu, C., Axente, D. & Balla, A. Study of Fe(III) adsorption onto Dowex-Marathon resin, as a rate determining step of the U(IV) oxidation in 235U enrichment column. J Radioanal Nucl Chem 308, 179–185 (2016). https://doi.org/10.1007/s10967-015-4273-4

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  • DOI: https://doi.org/10.1007/s10967-015-4273-4

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