Uranium Recovery from Aqueous Solutions Using Amidoxime Modified Cellulose Derivatives. II. Uranium Uptake Behavior of Amidoximated Ethyl Cellulose

Abstract

Amidoxime modified ethyl cellulose (EC-g-AO) was used for the recovery of uranyl ions from aqueous solutions by a complexation process.  Adsorption trials were carried out in different concentrations of UO₂²⁺ solutions (100 – 1000 mg/L) and at temperatures ranging from 25 to 50°C. The kinetics and the thermodynamics of the adsorption of uranyl ions (UO₂²⁺) by EC-g-AO were investigated. The adsorption capacity was found as 240 mg UO₂²⁺/g dry copolymer. The thermodynamic parameters for the interaction of UO₂²⁺ with EC-g-AO were calculated from thermodynamic relations. Calculations showed that adsorption occurred through strong electrostatic interactions with an enthalpy of -23.6 kJ/mol. The desorption of UO₂²⁺ was investigated by desorption agents like EDTA, HCl, NaHCO₃, and NaOH. 52 % of desorption yield was found for NaHCO₃.

Keywords

• ethyl cellulose,uranium,NaHCO3,adsorption enthalpy

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