title: Effect of temperature on the sorption of europium on alumina: microcalorimetry and batch experiments.
abstract: The determination of enthalpies of reactions (aqueous and surface complexation) is used in this work to model the temperature effect on the adsorption processes. Microcalorimetry experiments were carried out to determine the enthalpy of adsorption of europium on γ-alumina at 25 °C. The stability constants at 50 °C were then calculated with the van't Hoff equation, and a 2-pK approach was used to model the adsorptive behavior of Eu on alumina at 50 °C, as a function of pH. The results have shown that the adsorption of Eu(3+) on the alumina surface is weakly endothermic. In the experimental conditions considered in the present study, the temperature has only a small effect on the adsorption reaction.
authors.affiliation: Clermont Université, Université Blaise Pascal, Laboratoire Microorganismes: Génome et Environnement, UMR CNRS 6023, 24 avenue des Landais, BP 80026, 63171 Aubière cedex, France.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Morel
authors.forename: Nicolas
authors.initials: N
authors.lastname: Marmier
authors.forename: Charlotte
authors.initials: C
authors.lastname: Hurel
authors.forename: Nicole
authors.initials: N
authors.lastname: Morel-Desrosiers
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D002151:Calorimetry; D005063:Europium / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D005063:Europium; D000537:Aluminum Oxide