1. Sorption of Eu3+ on dickite particles studied by Raman, luminescence, and X-ray photoelectron spectroscopies
- Author
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Cremel, Sébastien, Zamama, Otmane, Dossot, Manuel, Lambert, Jacques, Humbert, Bernard, and Ehrhardt, Jean-Jacques
- Subjects
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EUROPIUM , *DICKITE , *PARTICLES , *RAMAN spectroscopy , *LUMINESCENCE spectroscopy - Abstract
Abstract: The sorption of europium(III) species from EuCl3 solution at pH=5.4 onto dickite particles is investigated using spectroscopic methods. Thanks to the neutrality of phyllosilicate sheets of dickite, cation exchange is prevented. X-ray photoelectron spectroscopy reveals that chloride atoms probably remain in the ligand sphere of the europium(III) cation. The edge site-specific reactivity is evidenced by epifluorescence microscopy and Raman spectroscopy. Comparison between dickite/europium(III) samples rinsed or not with distilled water shows that the surface processes not only involve inner-sphere complex formation, but also either outer-sphere complex or surface precipitation. Raman spectra also indicate that europium(III) surface complexes are preferentially localised at the edge of tetrahedral silica sheets. [Copyright &y& Elsevier]
- Published
- 2007
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