Abstract—The sorption of heavy metals (Cd2+, Ni2+) on activated carbons produced from olive stones (OSAC) was studied by using a batch technique. OSAC was prepared by tow processes using phosphoric acid as chemical agent. The physicochemical proprieties of these carbon materials were investigated in the term of N2 adsorptions, pHpzc and SEM-EDX. Cd(NO3)2,4H2O and Ni(NO3)2,3H2O were used as heavy metal samples. The effects of equilibrium time, initial concentration and initial pH were investigated. The adsorption isotherms of heavy metals from aqueous solution were determined. These isotherms were seen to be consistent with Langmuir adsorption isotherm. The adsorption constant rate was determined for obtained kinetics curves suitable for second degree of rate kinetics. Chemical and combined activated carbons were compared according to their percent of removal of heavy metals.
Index Terms—Olive stones, activated carbon, cadmium, nickel, adsorption, aqueous solution, equilibrium, kineticsadsorption.
Th. Bohli and A. Ouederni are with Laboratory of Research: Engineering Processes and Industrials systems (LR11ES54) National School of Engineers of Gabès, University of Gabes, Tunisia (e-mail:bohli_th@yahoo.fr)
N. Fiol and I. Villaescusa are with the Departement d’Enginyeria Quimica, Agraria i Tecnologia Agroalimentaria Universitat de Girona, AvdaLluis Santolo, 17003 Girona, Spain.
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Cite: Th. Bohli, A. Ouederni, N. Fiol, and I. Villaescusa, "Uptake of Cd2+ and Ni2+ Metal Ions from Aqueous solutions By Activated Carbons Derived from Waste Olive Stones," International Journal of Chemical Engineering and Applications vol. 3, no. 4, pp. 232-236, 2012.
