Volume 10, Numéro 1, Pages 37-54

The Removal Of Heavy Metal Ions (copper, Zinc, Nickel And Cobalt ) By Natural Bentonite

Authors : Ghomri F . Lahsini A . Laajeb A . Addaou A .


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 ΔG2+) 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. 2+ 2+ 2+


natural Bentonite, Copper (Cu2+), Zinc (Zn2+), Nickel (Ni2+),Cobalt (Co2+), adsorption, thermodynamic parameters.