عنوان مقاله [English]
نویسندگان [English]چکیده [English]
: The potential use of a biosorbent, Ca-pretreated leaf powder of orientals platanus was investigated for the sorption of Th (IV) ions from aqueous solutions by considering equilibrium, kinetic and thermodynamic aspects by means of the batch method. Th(IV) uptake by the leaf powder of oriental platanus was the pH, biosorbent dosage, contact time, initial adsorbate concentration, and temperature dependence. Biosorption process at the studied initial Th(IV) ion concentrations followed the pseudo-second order kinetic model (R2=0.9957). The biosorption data could be well described by Langmuir isotherm in comparison to Freundlich and Dubinin- Radushkevich isotherms. The maximum adsorption capacity was estimated to be 200 mg g-1 at 25°C with the pH of 3.5 by means of the Langmuir model. The thermodynamic parameters indicated that the biosorption of Th(IV) on the biomass was a feasible, spontaneous and endothermic process at the studied temperatures. The reusability of the biomass was also determined after five sorption-desorption cycles and the adsorption capacity decreased only by about 20%.