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

► 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.