The aim of this paper is to study the date seeds potential for azo dye biosorption of from aqueous solution. As shown in SEM analysis, treated date seeds were found to be effective in methyl orange dye removal. Thermodynamic parameters depicted the exothermic nature of biosorption and the process was feasible and spontaneous at all temperatures (293-313 K). Kinetic results showed that the pseudo-second-order kinetic model was well fitted to the experimental data and indicated that the biosorption was classified as chemical process. The Langmuir and Dubinin–Radushkevich (D–R) isotherm models were applied to the equilibrium data. Adsorption data were well described by the Langmuir and the maximum uptake of methyl orange onto date seeds was found to be 47.61 mg g-1 . The mean free energy for azo dye from the D-R isotherms confirms that the methyl orange was chemisorbed onto treated date seeds.
A. Rezgui, E. Guibal, T. Boubaker
Date seeds, biosorption, SEM analysis, isotherms, kinetic, chemisorption