ADSORPTION DE Cs+, Ni2+ ET DES LANTHANIDES SUR UNE KAOLINITE ET UNE SMECTITE JUSQU'A 150°C : ETUDE EXPERIMENTALE ET MODELISATION.

Abstract : The motivation for this study is to assess the temperature effect on the clay minerals sorption properties. Sorption and desorption of Cs+, Ni2+ et Ln3+ onto a montmorillonite and a kaolinite were performed by batch experiments between 25 and 150°C, and in different pH and ionic strengths conditions. Sorption enthalpies varying between 0 and 80kJ/mol were then calculated. For europium, surface spectroscopic analyses confirmed that the mechanism involved is adsorption, including at 150°C. Moreover, this method allowed us to obtain qualitatively the different adsorption equilibrium occurring during the reaction. An acid/base study of the clay surfaces was performed in order to assess the temperature effect on the surface charge of these minerals. Then, a surface complexation model including edge sites and structural sites was proposed to interpret the acid/base data and the europium sorption data.
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Geochemistry. Université Paul Sabatier - Toulouse III, 2005. French


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Submitted on : Tuesday, November 28, 2006 - 11:51:07 AM
Last modification on : Thursday, March 12, 2015 - 12:03:00 PM

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Emmanuel Tertre. ADSORPTION DE Cs+, Ni2+ ET DES LANTHANIDES SUR UNE KAOLINITE ET UNE SMECTITE JUSQU'A 150°C : ETUDE EXPERIMENTALE ET MODELISATION.. Geochemistry. Université Paul Sabatier - Toulouse III, 2005. French. <tel-00116839>

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