KINETIC, THERMODYNAMIC AND EQUILIBRIUM STUDIES ON ADSORPTION OF ALUMINA AND ZINC IONS ONTO ACTIVATED CARBON FROM

The husk of Moringa will oleifera, agricultural solid waste was transformed into activated carbon for elimination of Alumina and zinc in aqueous solution. Adsorption equilibrium was obtained after 2 minutes. The yield of elimination of alumina and zinc is respectively 99.97 % and 99.99%. Experimental data were analyzed by 4 isotherms (Langmuir, Freundlich, Temkin and Dubinin-Radushkevic). The value of constant non Freundlich model for zinc lies between 0 and 0.5, whereas alumina one lies between 0.5 and 1. Adsorption energies from the model of Dubinin-Radushkevic, were all lower than 8 kJmol-1, which indicated that adsorption was physical and thermodynamic. Kinetic model of pseudo-second order is applicable to adsorption of alumina and zinc on activated carbon of husk of Moringa will Oleifera their R2 is close to 1. Adsorption mechanism of metals ions was made according to this order kinetic model in two phases: the first was the diffusion of alumina and zinc ions towards the surface of the adsorbent and followed by interaction between molecules of adsorbates and adsorbent surface. Thermodynamic parameters proved the adsorption of aluminum and zinc into the activated carbon prepared from Moringa will oleifera is possible, spontaneous and exothermic in the ranges of temperatur