Document Type: Research Paper
In this study, the adsorption behavior of an alginate biopolymer microspheres containing D2 EHPA/TOPO (DTMCs) toward samarium (III) and gadolinium (III) ions was examined under various conditions. Scanning electron microscope (SEM) and thermogravimetric analysis (TGA) techniques were used to characterize the structure of microspheres. The average size of the microspheres was estimated around 500µm by SEM and also TGA technique showed that the microcapsules was stable until 150 °C. It was found that Sm (III) and Gd (III) ions can be adsorbed onto DTMCs in the concentration range 5-50 ppm while the uptake of these ions completed just 30 minutes. The results of adsorption suggested that the Freundlich isotherm was in good agreement with the experimental data. Furthermore, the study on the reaction mechanism showed that chemical reaction was controlling step compared to film and intraparticle diffusions.