Adsorptive Removal of Chromium (VI) from Aqueous Solution Using Cow Hooves.

Osasona, Ilesanmi and Ojo Adebayo, Albert and Ajayi, Olubode Olumuyiwa (2013) Adsorptive Removal of Chromium (VI) from Aqueous Solution Using Cow Hooves. Adsorptive Removal of Chromium (VI) from Aqueous Solution Using Cow Hooves., 2 (1). pp. 1-16.

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Abstract

Aim: To investigate the use of Nigerian cow hooves for the removal of chromium VI from aqueous solution. Place and Duration: Chemistry Laboratory, Federal University of Technology, Akure and Chemistry Laboratory of Afe Babalola University, Ado-Ekiti, Nigeria, from September 2011 to June 2012. Methodology: The adsorption process, which was carried out through batch method, was investigated over a range of pH (2-7), agitation time (0-150 mins) and adsorbent mass (1.0-3.0 g per 50 mL of metal solution). The adsorption isotherms were obtained using initial metal concentrations ranging from15 to100 mgL-1. After agitation, the resultant solution was analyzed for Cr (VI) using Atomic Absorption Spectrophotometer. Results: The optimum operating parameters obtained for the adsorption process are pH 2 (89.5% removal) and time of 30 mins (34.4% removal) while the highest metal uptake (mgg-1) was recorded for 1g of the adsorbent per 50ml of solution. Langmuir, Freundlich and Dubinin-Raduskevich (D-R) isotherm models were applied to describe the experimental data. The Langmuir maximum adsorption capacities of the cow hoof for Cr (VI) at 298, 308 and 318 K were determined to be 3.57, 4.81 and 5.71 mgg-1 respectively. Freundlich isotherm model fitted the equilibrium data better than Langmuir and D-R models. The mean free energy (E) which was calculated from D-R model indicated that the sorption process was dominated by physisorption mechanism. The adsorption kinetics was found to follow the pseudo-second-order model. Conclusion: This study revealed that cow hoof powder can be used as a low cost adsorbent for the removal of Cr (VI) from wastewater under the optimum conditions of pH 2 and contact time of 30mins while the thermodynamic parameters- ΔG0, ΔH0 and ΔS0 indicated that the adsorption process was endothermic, feasible and spontaneous.

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