Abstract
ABSTRACT A macroporous copolymer of styrene and divinylbenzene resin (TVEX-PHOR) was examined for adsorption of terbium(III) and gadolinium(III) from nitrate medium. Characterization of TVEX-PHOR before and after adsorption was investigated. Different factors affecting the sorption equilibrium were studied and a maximum separation value of 2.31 was reached at V/m = 0.3 L/g. Adsorption kinetics data indicated that the pseudo-second-order model is more applicable, while the isothermal data were found to be correlated with Freundlich model. The resin uptake capacity towards Tb(III) (24.93 mg/g) was more than that of Gd(III) (15.49 mg/g). Thermodynamic parameters of sorption indicated that the process was spontaneous and exothermic.
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