Effect of temperature on the sorption of europium on alumina: Microcalorimetry and batch experiments

[Display omitted] ► Adsorption of Eu3+ on the alumina surface in acidic media, which includes the deprotonation of the surface, is a weakly endothermic process. ► The pK values calculated at 50 °C using the van’t Hoff equation and the calorimetrically-determined enthalpies are in good accordance wit...

Full description

Saved in:
Bibliographic Details
Published in:Journal of colloid and interface science 2012-06, Vol.376 (1), p.196-201
Main Authors: Morel, Jean-Pierre, Marmier, Nicolas, Hurel, Charlotte, Morel-Desrosiers, Nicole
Format: Article
Language:English
Subjects:
Adsorption
Aluminum Oxide
Aluminum Oxide - chemistry
Analytical chemistry
Biotechnology
Calorimetry
Chemical Sciences
Chemistry
Complexation
Computer Science
Enthalpy
equations
Europium
Europium - chemistry
Exact sciences and technology
General and physical chemistry
Inorganic chemistry
Life Sciences
Material chemistry
Mathematical analysis
Mathematical models
Microcalorimetry
or physical chemistry
Radiochemistry
Surface chemistry
Surface complexation modeling
Surface physical chemistry
Temperature
Theoretical and
Thermodynamics
Water
Water - chemistry
γ-Alumina
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] ► Adsorption of Eu3+ on the alumina surface in acidic media, which includes the deprotonation of the surface, is a weakly endothermic process. ► The pK values calculated at 50 °C using the van’t Hoff equation and the calorimetrically-determined enthalpies are in good accordance with experiments. ► In the tested conditions, temperature has only a small effect on adsorption. 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 Eu3+ 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.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2012.02.035