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Sorption of iodine on Mg-Al-layered double hydroxide

Published online by Cambridge University Press:  09 July 2018

H. Curtius  and
Z. Kattilparampil
H. Curtius*
Affiliation:
Institute for Safety Research and Reactor Technology, Forschungszentrum Jülich, D-52425 Jülich, Germany
Z. Kattilparampil
Affiliation:
Institute for Safety Research and Reactor Technology, Forschungszentrum Jülich, D-52425 Jülich, Germany
*
E-mail: h.curtius@fz-juelich.de
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Abstract

From leaching experiments with metallic uranium-aluminium material test reactor fuel elements in repository-relevant MgCl2-rich salt brines, a Mg-Al-layered double hydroxide with chloride as interlayer anion was identified as a crystalline secondary phase component. In the present study, this Mg-Al-Cl-layered double hydroxide (Mg-Al-Cl-LDH) was synthesized and its ability to adsorb iodine was evaluated. The adsorption of I– was rapid, and equilibrium for an initial concentration of 4.25 x 10-5 mole/l was obtained within 48 h. Further results indicated that the adsorption isotherm for I– retention could be fitted to Freundlich and Dubinin-Radushkevich equations. The values obtained indicate that iodine is adsorbed on Mg-Al-Cl-LDH by an anion- exchange process. The adsorption of I– was also studied as a function of pH. In the pH range between 3.5 and 8.5, the adsorption was independent of the pH. The effects of competiting anions were investigated using an MgCl2-solution instead of water, and indicate that chloride anions have a greater affinity towards the Mg-Al-Cl-layered double hydroxide than iodine.

Keywords

hydrotalciteiodinesorption
Type
Research Article
Information
Clay Minerals , Volume 40 , Issue 4 , December 2005 , pp. 455 - 461
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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