The UO biosorption properties of a lichen, Evernia prunastri, from aqueous solutions were investigated. The widely occurring lichen samples were collected from the forest in Bilecik-Turkey. The UO biosorption onto lichen was characterized by FT-IR and SEM-EDX analysis techniques before and after biosorption. The effects of the solution pH, biosorbent dosage, UO concentration, contact time, and temperature on UO biosorption on lichen sample were studied by using the batch method. The isotherm experimental data were described using isotherm models of Langmuir, Freundlich and Dubinin Radushkevich. The maximum UO biosorption capacity of the lichen sample was estimated by the Langmuir equation to be 0.270 mol kg. The adsorption energy from the Dubin Radushkevich model was found to be 8.24 kJ mol. Kinetic data determined that the biosorption was best described by the pseudo-second-order kinetic model. Thermodynamic findings showed that the biosorption process was endothermic, entropy increased and spontaneous. In conclusion, the lichen appears to be a promising biosorbent for the removal of UO ions from aqueous solutions because of high biosorption capacity, easy usability, low cost, and high reusability performance.
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| http://dx.doi.org/10.1016/j.jenvrad.2019.05.008 | DOI Listing |
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