Effective UO2 2+ removal from aqueous solutions using lichen biomass as a natural and low-cost biosorbent
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The UO2 2+ 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 UO2 2+ 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, UO2 2+ concentration, contact time, and temperature on UO2 2+ 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 UO2 2+ biosorption capacity of the lichen sample was estimated by the Langmuir equation to be 0.270 mol kg−1. The adsorption energy from the Dubin Radushkevich model was found to be 8.24 kJ mol−1. 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 UO2m 2+ ions from aqueous solutions because of high biosorption capacity, easy usability, low cost, and high reusability performance.