摘要
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 纬-alumina at 25 掳C. The stability constants at 50 掳C were then calculated with the van鈥檛 Hoff equation, and a 2-pK approach was used to model the adsorptive behavior of Eu on alumina at 50 掳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.