Özet:

In the present study, biosorption behaviours of novel biosorbent, Narcissus Tazetta L. leaf powder, were investigated for the separation of Eu(III) from aqueous solution. Batch experiments were conducted to examine the effect of various parameters such as contact time, initial pH, initial Eu(III) concentration, biosorbent dosage and temperature on the Eu(III) uptake. The biosorption process is fast, and equilibrium was established in 30 min. of contact time. It was found that the material has a significant biosorption capacity for europium in the pH range of 4-7. The results showed that the biosorption data fit Langmuir monolayer isotherm and pseudo-second order kinetic model well. Biosorption capacity of leaf powder was obtained as 122.0 mg g-1 at pH 7. Thermodynamic analysis indicates that the biosorption was spontaneous and endothermic in nature. Desorption efficiency(%) of 97.17 was achieved in single step using 0.1 mol L-1 HNO3 solution. Surface area of the biosorbent and the average pore size were determined as 1.725 mg g-1 and 1.75 nm, respectively. The critical functional groups -CH, C-O, O-H, C=O and COO- which may have taken part for the biosorption were identified by infrared spectra data. It was deduced that N. Tazetta leaf powder can be used as an effective, costless, and eco-friendly biosorbent for the separation and recovery of Eu(III) from aqueous solution.