Cobalt Adsorption on A Low Cost Carbonaceous Adsorbent – Kinetic, Equilibrium and Mechanistic Studies

DOI : http://dx.doi.org/10.13005/msri/032a13

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A carbonaceous adsorbent prepared from an indigenous waste, by acid treatment was tested for its efficiency in removing metal ion. The process parameters studied include agitation time, initial Cobalt ion concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intraparticle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plot were 28.248, 26.954, 27.129, 26.150 mg/g respectively at an initial pH of 6.0 and at 30, 40, 50, 60 ± 0.50C. The influence of pH on metal ion removal was significant and the adsorption was increased with increase in temperature. A portion of the Cobalt was recovered from the spent carbon using 0.1M HCl.

Activated carbon; cobalt ion; adsorption isotherm; equilibrium