THE REMOVAL OF HEAVY METAL IONS (COPPER, ZINC, NICKEL AND COBALT) BY NATURAL BENTONITE
Journal Title: Larhyss Journal - Year 2013, Vol 12, Issue 12
Abstract
The removal of Copper (Cu2+), Zinc (Zn2+), Nickel (Ni2+) and Cobalt (Co2+) from aqueous solutions by adsorption onto natural bentonite was investigated. Experiments were carried out as a function of shaking time, temperature of solution and thermal treatment of bentonite. The kinetic processes of metal ions adsorption on bentonite were described by applying pseudo-first order and pseudo-second order rate equations. The pseudo-second order reaction rate model was found to describe best the kinetic data. The thermodynamic parameters (ΔH, ΔS and ΔG) for Copper (Cu2+), Zinc (Zn2+), Nickel (Ni2+) and Cobalt (Co2+) adsorption onto bentonite were also determined from the temperature dependence. The adsorption was endothermic reactions for Copper (Cu2+) and Zinc (Zn2+), and exothermic for Nickel (Ni2+) and Cobalt (Co2+). The results suggested that natural bentonite is suitable as an adsorbent material for adsorption of metal ions from aqueous solutions.
Authors and Affiliations
GHOMRI F. | Equipe Matériaux et Procédés Industriels, Laboratoire des Sciences et de Technologie des Génies des Procédés Ecole Supérieure de Technologie, Université Sidi Mohamed Ben Abdellah / Fez, Morocco, LAHSINI A. | Equipe Matériaux et Procédés Industriels, Laboratoire des Sciences et de Technologie des Génies des Procédés Ecole Supérieure de Technologie, Université Sidi Mohamed Ben Abdellah / Fez, Morocco, LAAJEB A. | Equipe Matériaux et Procédés Industriels, Laboratoire des Sciences et de Technologie des Génies des Procédés Ecole Supérieure de Technologie, Université Sidi Mohamed Ben Abdellah / Fez, Morocco, ADDAOU A. | Equipe Matériaux et Procédés Industriels, Laboratoire des Sciences et de Technologie des Génies des Procédés Ecole Supérieure de Technologie, Université Sidi Mohamed Ben Abdellah / Fez, Morocco
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