title: Strontium selectivity in sodium nonatitanate Na ₄Ti₉O₂₀·xH₂O.
abstract: We study the extraction of strontium by sodium nonatitanate powder from nitrate strontium and acetate sodium mixture. Experiments show that adsorption is quantitative. The excess Gibbs free energy has been modeled by various models (ideal, 2D Coulomb, regular solution model) for the solid phase. We find that the free energy of the solid phase is controlled by short-range interactions rather than long-ranged Coulombic forces. The selectivity is the consequence of a competition between the liquid and solid phases: both phases prefer strontium rather than sodium but the solid contribution is predominant.
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-UM2-CNRS-ENSCM, Site de Marcoule, BP 17171, F-30207 Bagnols-sur-Cèze, France. Electronic address: arnaud.villard@univ-montp2.fr.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Villard
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-UM2-CNRS-ENSCM, Site de Marcoule, BP 17171, F-30207 Bagnols-sur-Cèze, France.
authors.forename: Bertrand
authors.initials: B
authors.lastname: Siboulet
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-UM2-CNRS-ENSCM, Site de Marcoule, BP 17171, F-30207 Bagnols-sur-Cèze, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Toquer
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-UM2-CNRS-ENSCM, Site de Marcoule, BP 17171, F-30207 Bagnols-sur-Cèze, France.
authors.forename: Aurélie
authors.initials: A
authors.lastname: Merceille
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-UM2-CNRS-ENSCM, Site de Marcoule, BP 17171, F-30207 Bagnols-sur-Cèze, France.
authors.forename: Agnès
authors.initials: A
authors.lastname: Grandjean
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-UM2-CNRS-ENSCM, Site de Marcoule, BP 17171, F-30207 Bagnols-sur-Cèze, France. Electronic address: jean-francois.dufreche@univ-montp2.fr.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Dufrêche
mesh_terms: D005591:Chemical Fractionation / Q000379:methods*; D008956:Models, Chemical; D009566:Nitrates / Q000737:chemistry; D013324:Strontium / Q000737:chemistry*
chemical_list: D009566:Nitrates; C104873:strontium nitrate; D013324:Strontium
keywords: Decontamination; Free energy calculation; Sodium nonatitanate; Strontium adsorption