Sorption of Eu3+ on dickite particles studied by Raman, luminescence, and X-ray photoelectron spectroscopies

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.
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Sébastien Cremel, Otmane Zamama, Manuel Dossot, Jacques Lambert, Bernard Humbert, et al.. Sorption of Eu3+ on dickite particles studied by Raman, luminescence, and X-ray photoelectron spectroscopies. Comptes Rendus Chimie, Elsevier Masson, 2007, 10 (10-11), pp.1050 - 1059. ⟨10.1016/j.crci.2007.01.013⟩. ⟨hal-01848787⟩

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