Kinetic investigations were carried out to evaluate the applicability of bypass Cement Kiln Dust (CKD) as a low cost adsorbent to removal of chromium trivalent from wastewater of tannery effluents. The effects of various kinetic parameters were investigated using a batch process. The results indicated to that, the contact time of around 60 min. was required to achieved equilibrium. The adsorption rate increases with increasing initial concentration of Cr(III) in the wastewater stream and processing temperature. The adsorption kinetics follows pseudo-second order rate equation better than the pseudo first order one. The results of the kinetics experiments showed that the adsorption of Cr(III) on CKD is an endothermic process and the activation energy of adsorption is 1.867 kJmol-1 . This small value of activation energy suggests that the adsorption easily occurs. That refers to the feasibility of the practical use of CKD as a low cost adsorbent for the removal of Cr(III) from aqueous systems.
علي يوسف عكاشة | Aly Y. Okasha | 11219