Kinetic, Equilibrium and ThermodynamicStudies of the Adsorption of Methylene Bluefrom Synthetic WastewaterUsing Cow Hooves

Ilesanmi, Osasona and Oluwabamise, Lekan Faboya and Anthony, Olawale Oso (2013) Kinetic, Equilibrium and ThermodynamicStudies of the Adsorption of Methylene Bluefrom Synthetic WastewaterUsing Cow Hooves. British Journal of Applied Science & Technology, 3 (4). pp. 1006-1021.

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Abstract

Aims:To investigate the feasibility and thekinetic of using cow hooves (CH) as a low-costadsorbent for the removal of methylene blue (MB) from synthetic wastewater.Place and Duration of Study:Chemistry Laboratory, Afe Babalola University, Ado-Ekiti,Nigeria, from October 2012 to January 2013.Methodology:This study was conducted through batch process. The influence of initialpH, contact time, CH dosage and temperature on the adsorption property of CH wasinvestigated using pH ranging from 2.0–11.0, contact time of 5-180 minutes, CH dosage of0.15–1.0 g and temperature of 298–318 K. All experiments were carried out using 0.25 g ofCH per 100 mL of MB solution except for effect of CH dosage. The equilibrium studieswere carried out using MB concentration ranging from 10–100 mgL-1at 298, 308 and318K and the experimental data obtained were analysed and modelled using Langmuir,Freundlich, Dubinin-Radushkevich (D-R) and Temkin isotherm models.Results:Our results indicated that a time of 90 minutes was required for equilibrium to beattained for25 mgL-1MB. The percentage removal of MB was found to increase withincrease in pH.The isotherm data were best fitted by Temkin isotherm model. The kineticsmodelling of the experimental data agreed with the pseudo-second-order model suggesting that chemisorption was the rate determining step. The values of thethermodynamic parameters (∆G0,∆H0and∆S0) revealed that the adsorption process wasspontaneous at very low temperature, feasible and exothermic.Conclusion:Cow hoof could be a promising low-cost adsorbent for the removal ofmethylene blue from wastewater and this could be bestachieved at high MB pH and withina period of one and half hours.

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