Role of sawdust in adsorption of Zn2+ and Cd2+ ions from aqueous system

Qasimullah Qasimullah, Anees Ahmad, Mohd Rafatullah, Othman Sulaiman, Rokiah Hashim


Sawdust, an inexpensive material, has been utilized as an adsorbent for the removal of Zn2+ and Cd2+ ions from aqueous solution. The effects of contact time, pH, concentration, and dosage of the adsorbent on the removal of Zn2+ and Cd2+ ions have been studied. The equilibrium nature of Zn2+ and Cd2+ ions adsorption at different temperatures was also studied. Two model viz.; Freundlich and Langmuir were tried to fit the observed data. Both the metal ions show a very interesting trend of adsorption where minima are seen in the adsorption isotherms. The thermodynamic parameters like free energy, entropy and enthalpy changes for the adsorption of Zn2+ and Cd2+ ions have also been computed and discussed. It is seen that the overall process of adsorption of Zn2+ ions is a multilayer endothermic process where as the Cd2+ ions shows composite adsorption behaviour.


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