W. M. Youssef, A. A. Elzoghby, A. A. Rateb, E. M. Helmy, K. A. Khalil, H. S. Gado
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引用次数: 0
Abstract
The study deals with U(VI) sorption from phosphoric acid media onto poly(hexamethylenesuccinamide) (PA46) (–CO(CH2)2)CO–NH(CH2)6NH–)n as a cation-exchange resin. The process was studied using SEM, FT-IR, and surface area determination. The effect exerted on the process by the contact time, liquid to solid ratio, temperature, stirring rate, and initial U(VI) concentration was examined. The adsorption capacity for uranium under the optimum conditions was found to be 25 mg/g. The sorption data were described using Langmuir, Freundlich, and Temkin isotherm models. The thermodynamic equilibrium constant and the Gibbs free energy were determined: ΔG° from ‒19.08 to ‒22.49 kJ/mol, ΔH ‒78.63 kJ/mol, and ΔS ‒199.83 J/(mol K). These data show that the adsorption is spontaneous. The kinetic data are best described by the pseudo-second-order model.
期刊介绍：
Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.
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