Abstract
Radioactive strontium is one of the major radioactive contaminant and its contamination is a very serious concern. Therefore, there is a need for economic, effective, non-toxic, readily available and abundant adsorbent or biosorbent to remove strontium from solutions. In this study, biosorption of 85Sr as a surrogate for 90Sr onto alginate beads was investigated in a batch system. Alginate beads were prepared from Na-alginate via cross-linking with divalent calcium ions according to the egg box model. The effect of several parameters such as pH, initial strontium concentration, contact time, dosage of alginate beads and temperature were investigated. In order to optimize the design of biosorption system for the removal of strontium, it is important to establish the most appropriate correlation for equilibrium curves. The experimental isotherm data were described by 6 different biosorption isotherm models, namely Langmuir, Freundlich, Dubinin–Radushkevich, Temkin, Flory–Huggins and Brunauer, Emmer and Teller, with constants obtained from linear and non-linear regression methods. The thermodynamic parameters (∆H°, ∆S° and ∆G°) for strontium biosorption were also determined. The results indicate that these alginate beads have a good potential for the biosorption of strontium from solutions.
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Acknowledgments
Cem Gök would like to acknowledge The Scientific and Technological Research Council of Turkey (TUBITAK) and Ege University OYP for providing necessary fellowships and Helmholtz-Zentrum München, German Research Center for Environmental Health, Institute of Radiation Protection for providing to facility the work presented in this paper. The authors are also grateful to J. Tschiersch, K. Leopold and all members of HMGU-ISS Workgroup Radioecology. The authors also express their sincere gratitude to Prof. Dr. Turgay Karali for his help.
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Gok, C., Gerstmann, U. & Aytas, S. Biosorption of radiostrontium by alginate beads: application of isotherm models and thermodynamic studies. J Radioanal Nucl Chem 295, 777–788 (2013). https://doi.org/10.1007/s10967-012-1838-3
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DOI: https://doi.org/10.1007/s10967-012-1838-3