The adsorption isotherm and thermodynamic studies of rhenium onto mesoporous silica nanoparticles

Abstract

In the case of mesoporous silica nanoparticle applications for nuclear medicine, for example in the case of nanoparticle labeling, it is often found cases of radiochemical impurities or low labeling efficiency which may be caused by the bonding properties that occur. In this work, the adsorption isotherm and thermodynamic studies of Rhenium onto mesoporous silica nanoparticles have been performed to determine the parameters associated with the surface properties of mesoporous nanoparticle silica for labeling purposes. Adsorption measurements were performed by a batch technique with the various initial concentration of rhenium solution (5, 10, 25, 50, 75, 100, 125, 150, and 200 ppm) and conducted with constant stirring for 20 minutes at 28, 35 and 45°C, respectively. The results of the experiment were analyzed using UV-Vis spectrophotometer and through data calculations showed that the properties of rhenium adsorption onto silica mesoporous nanoparticles, among others, are exothermic (negative value of ΔH), spontaneous reactions (negative value of ΔG), and follow adsorption of chemisorption (ΔH value range -55,45 to -137,04 kJ/mol).