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Clay Minerals; December 2005; v. 40; no. 4; p. 455-461; DOI: 10.1180/0009855054040183
© 2005 Mineralogical Society of Great Britain and Ireland
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Research Paper

Sorption of iodine on Mg-Al-layered double hydroxide

H. CURTIUS* and Z. KATTILPARAMPIL

Institute for Safety Research and Reactor Technology, Forschungszentrum Jülich, D-52425 Jülich, Germany

* E-mail: h.curtius{at}fz-juelich.de

(Received 3 August 2004; revised 19 November 2004)

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: hydrotalcite, iodine, sorption






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