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

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• 作者：Sé ; bastien Cremel ; Otmane Zamama ; Manuel Dossot ; Jacques Lambert ; Bernard Humbert ; Jean-Jacques Ehrhardt
• 关键词：Dickite ; Clay mineral ; Europium ; Sorption ; Edge site ; Spectroscopy
  Mots-clé ; s ; Dickite ; Argile ; Europium ; Sorption ; Bord de feuillet ; Spectroscopie
• 刊名：Comptes Rendus Chimie
• 出版年：2007
• 出版时间：October-November 2007
• 年：2007
• 卷：10
• 期：10-11
• 页码：1050-1059
• 全文大小：1031 K

文摘

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.