Abstract
We explored the use of selected layered double hydroxides (LDHs) of different compositions and obtained by means of different routes (i.e., coprecipitation, anionic exchange and reconstruction) as iodine/iodate adsorbents. The influence of speciation (iodide vs. iodate) on iodine uptake was rather strong, resulting in much lower iodide incorporation. The Fourier transform of iodine K X-ray absorption edge data (EXAFS) of all iodate-LDHs showed a single I–O scattering path of 1.8 Å. Thermal stability and leaching experiments showed that the incorporated iodate and iodide were rather loosely bound in the interlayer space and were easily released under heating to 180 °C and leaching with Milli-Q water and brine solution.
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Acknowledgments
The project underlying this research was funded by the Federal Ministry of Education and Research under the project number 02NUK021G promoted. We are grateful to Mr Michael Klatt for the XRD measurements, and to Dr Andreas Scheinost at the Rossendorf Beamline BM20, ESRF, Grenoble, France for the EXAFS measurements.
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Iglesias, L., Walther, C., Medina, F. et al. A comprehensive study on iodine uptake by selected LDH phases via coprecipitation, anionic exchange and reconstruction. J Radioanal Nucl Chem 307, 111–121 (2016). https://doi.org/10.1007/s10967-015-4285-0
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DOI: https://doi.org/10.1007/s10967-015-4285-0