Abstract: “The kinetics of biosorption of Cu++ ions by biomass of Helianthus Annuus was found fast, and reached equilibrium in 20 min and followed pseudo-second order rate equation. To evaluate the biosorption equilibrium, four isotherm models were fitted to experimental data. The best model was determined by taking into account correlation coefficient (r2) and Average Percentage Error (APE). The best adjustment from two parameter isotherms was observed to be the D-R (r2 0.973, APE % 1.60). The mean energy of biosorption was calculated as 12.69 kJ mol−1 from the D-R biosorption isotherm. Activation energy (Ea) of the biosorption was determined as 8.56 kJ mol-1. Thermodynamic parameters such as ∆H°, ∆S° and ∆G° were calculated from the slope and intercept of linear plot of lnKD versus 1/T.”

Keywords: Copper (II), Isotherm, Helianthus Annuus, Thermodinamic, Biosorption