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Mélange d'électrolytes en solution : de la modélisation à l'application pour la décontamination du strontium par le nonatitanate de sodium

Abstract : The objective of this thesis is to study the ionics decontamination of aqueous solutions by ionic oxide exchangers with a particular focus on the strontium adsorption by the sodium nonatitanate. The goal is to develop a predictive model takes into account the phenomena involved, and the deviations to the ideality into the solution but also in the material.The activity coefficients of the ions in solution have been calculated from an approach based on the MSA theory (Mean Spherical Approximation), where the specific association phenomenons have been taken into account. This allowed for calculating the ionic activity coefficients in the ternary mixtures. The validity of mixture laws of Zdanovskii-Stokes-Robinson and McKay-Perring has been also specified. Two activity models, which represent the long and the short-range interactions, have been used for the ionic studied in the solid. The adsorption isotherms at various concentrations have been hence modeled.A pH-metric study has also been performed on the sodium nonatitanate in order to determine the hydrolysis constant as well as the solid hydrolysis rate. A structural and morphologic study allowed for highlighting that for highly acidic solutions the sodium nonatitanate is dissolved and precipitated again under different crystallographic forms of the TiO2.
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Arnaud Villard. Mélange d'électrolytes en solution : de la modélisation à l'application pour la décontamination du strontium par le nonatitanate de sodium. Autre. Université Montpellier, 2015. Français. ⟨NNT : 2015MONTS133⟩. ⟨tel-01980551⟩

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