Removal of Th(IV) ions from aqueous solution using bi-functionalized algae-yeast biosorbent |
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Authors: | Email author" target="_blank">Cem?GokEmail author Dogukan?Alkim?Turkozu Sule?Aytas |
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Affiliation: | (1) Institute of Nuclear Sciences, Ege University, Bornova, 35100, Izmir, Turkey;(2) Faculty of Engineering and Architecture, Department of Environmental Engineering, Yuzuncu Yil University, Zeve Campus, 65080, Van, Turkey |
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Abstract: | Composites could be more effective adsorbents than inorganic and organic components individually. In the present study, the
red macro marine algae, Jania Rubens and yeast, Saccharomyces cerevisiae immobilized on silica gel were used as a constituent of bi-functionalized biosorbent to remove thorium ions from aqueous
solution. Optimum biosorption conditions were determined as a function of pH, initial Th(IV) concentration, contact time,
temperature, volume/mass ratio and co-ion effect. The morphological analysis of the biocomposite was performed by the scanning
electron microscopy and functional groups in the biosorbent were determined by FT-IR spectroscopy. In order to find the adsorption
characteristics, Langmuir, Freundlich, and Dubinin–Radushkevich adsorption isotherms were applied to the adsorption data.
The data were well described by Langmuir adsorption isotherms while the fit of Freundlich adsorption isotherms and Dubinin–Radushkevich
equation to adsorption data was poor. Using the equilibrium constant value obtained at different temperature, the thermodynamics
properties of the biosorption (ΔG°, ΔH° and ΔS°) were also determined. The results show that biosorption of Th(IV) ions onto biocomposite was exothermic nature, spontaneous
and more favorable at lower temperature under examined conditions. |
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