Biosorption of uranium(VI) from aqueous solution using calcium alginate beads

WOS: 000267567600054PubMed ID: 19303705In this paper, sorption potentials of uranium ions were studied using alginate polymer beads in diluted aqueous solutions. The ability of alginate beads to adsorb uranium(VI) from aqueous solution has been studied at different optimized conditions of pH, U(VI) concentration, contact time, biomass dosage and temperature. In order to determine the adsorption characteristics, Langmuir, Freundlich, and Dubinin-Radushkevich adsorption isotherms were applied to the adsorption data. The thermodynamic parameters such as variations of enthalpy Delta H, entropy Delta S and variation of Gibbs free energy Delta G were calculated from the slope and intercept of In K-d vs. 1/T plots. The results suggested that alginate beads could be suitable as a sorbent material for adsorption and removal of uranium ions from dilute aqueous solutions. (C) 2009 Elsevier B.V. All rights reserved.The Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)The authors express their sincere gratitude to Assoc. Prof. Dr. Turgay Karali, Prof. Dr. Sema AkyiI, Assist. Prof. Dr. Mahmoud A.A. Aslani, Res. Assist. Sabriye Yusan and grateful to Senar Gok for their helps and supports. Cem Gok sincerely acknowledges The Scientific and Technological Research Council of Turkey (TUBITAK) for providing necessary fellowships