Adsorptive Removal of Chromium (VI) fromAqueous SolutionUsingCow Hooves

Osasona, Ilesanmi and Adebayo, Albert Ojo and Ajayi, Olubode Olumuyiwa (2013) Adsorptive Removal of Chromium (VI) fromAqueous SolutionUsingCow Hooves. Journal of Scientific Research & Reports, 2 (1). pp. 288-303. ISSN 288-303

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Abstract

Aim:To investigate the use of Nigerian cow hooves for the removal of chromium VI fromaqueous solution.Place andDuration:Chemistry Laboratory, Federal University of Technology, Akure andChemistry Laboratory of Afe Babalola University, Ado-Ekiti, Nigeria, from September 2011to June 2012.Methodology:The adsorption process, which was carried out through batch method, wasinvestigated 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 usinginitial metal concentrations ranging from15 to100 mgL-1. After agitation, the resultantsolution was analyzed for Cr (VI) using Atomic Absorption Spectrophotometer.Results:The optimum operating parameters obtained for the adsorption process are pH2 (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, Freundlichand Dubinin-Raduskevich (D-R) isotherm models were applied to describe theexperimental 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-1respectively.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 thatthe sorption process was dominated by physisorption mechanism.The adsorption kineticswas found to follow the pseudo-second-order model.Conclusion:This study revealed that cow hoof powder can be used as a low costadsorbent for the removal of Cr (VI) from wastewater under the optimum conditions of pH2 and contact time of 30minswhile the thermodynamic parameters-∆G0,∆H0and∆S0indicated that the adsorption process was endothermic, feasible and spontaneous

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