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Synthesis of a Mg-Cd-Al layered double hydroxide and sorption of selenium

Published online by Cambridge University Press:  01 January 2024

Birte Hansen ,
Hilde Curtius  and
Reinhard Odoj
Birte Hansen*
Affiliation:
Institute for Energy Research - Safety Research and Reactor Technology (IEF-6), Research Centre Jülich GmbH, D-52428 Jülich, Germany
Hilde Curtius
Affiliation:
Institute for Energy Research - Safety Research and Reactor Technology (IEF-6), Research Centre Jülich GmbH, D-52428 Jülich, Germany
Reinhard Odoj
Affiliation:
Institute for Energy Research - Safety Research and Reactor Technology (IEF-6), Research Centre Jülich GmbH, D-52428 Jülich, Germany
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Leaching experiments with metallic uranium-aluminum research-reactor fuel elements in repository-relevant MgCl2-rich salt brine (brine 2) were performed. A Mg-Al layered double hydroxide (LDH) with chloride as the interlayer anion was identified as a crystalline secondary-phase component. In the present study, the incorporation of Cd into the structure of the Mg-Al-Cl LDH was investigated. Synthesis by a coprecipitation method was performed and the Mg-Cd-Al-Cl LDH obtained was characterized. The sorption behavior of selenium on the LDH was investigated in water, clay pore-water (Mont-Terri-type), and brine 2. Using a LDH concentration of 10 g/L, the sorption kinetics were rapid and equilibrium was reached within 12 h. The sorption of selenium decreased with increasing amount of chloride anions in the solutions. The chloride anions acted as competing anions for the sorption of selenium. The effect of pH on selenium sorption was investigated and a large buffer capacity of the LDH was observed. For the range of selenium concentration used, linear sorption isotherms were obtained which obeyed the Freundlich and Dubinin-Radushkevich models. From these, the energies of selenium sorption were calculated to be in the range of ion-exchange processes.

Keywords

Clay Pore-waterLayered Double HydroxidesMgCl2-rich Salt BrineSorption
Type
Article
Information
Clays and Clay Minerals , Volume 57 , Issue 3 , June 2009 , pp. 330 - 337
Copyright
Copyright © The Clay Minerals Society 2009

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