Abstract
Amidoxime modified hydroxypropyl methylcellulose (HPMC) films (HPMC-g-AO) were used for the recovery of uranium from aqueous solutions by a complexation process. The adsorption experiments were carried out by immersion of a certain amount of films in UO2 2+ solutions (resultant pH 4.1) ranging in concentration from 100 to 1,000 ppm. The effect of temperature (25–50 °C) on the adsorption capacity of HPMC-g-AO was investigated at the optimized time. The adsorption kinetics and the thermodynamics as well as the adsorption capacity of HPMC-g-AO films were investigated. The adsorption capacity was found as 765 mg UO2 2+/g dry film. The kinetic and the thermodynamic parameters (i.e. activation energy, enthalpy, entropy and Gibbs free energy) for the interaction of UO2 2+ with HPMC-g-AO were calculated based on known basic relations. The results showed that adsorption occurred through strong electrostatic interactions with an enthalpy of −36.5 kJ/mol. The desorption of UO2 2+ were investigated using different desorption agents such as EDTA, HCl, NaHCO3, and NaOH. After the 2 weeks treatment period, the highest desorption yield were found as 23 % with NaHCO3.
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This study was carried out in accordance with the Chemistry Department, Hacettepe University. The support of the HU Scientific Research Foundation through the HU-BAB-0901601008 project is gratefully acknowledged.
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Başarır, S.Ş., Bayramgil, N.P. The uranium recovery from aqueous solutions using amidoxime modified cellulose derivatives. IV. Recovery of uranium by amidoximated hydroxypropyl methylcellulose. Cellulose 20, 827–839 (2013). https://doi.org/10.1007/s10570-012-9845-7
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DOI: https://doi.org/10.1007/s10570-012-9845-7