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Adsorptive Removal of Methylene Blue from Aqueous Solution Using Agricultural Waste: Equilibrium, Kinetic and Thermodynamic Studies
Current Issue
Volume 2, 2015
Issue 3 (December)
Pages: 14-25   |   Vol. 2, No. 3, December 2015   |   Follow on         
Paper in PDF Downloads: 162   Since Nov. 4, 2015 Views: 2497   Since Nov. 4, 2015
Authors
[1]
Enenebeaku K. Conrad, Department of Chemistry, School of Physical Sciences, Federal University of Technology, Owerri Imo State, Nigeria.
[2]
Okorocha J. Nnaemeka, Department of Chemistry, School of Physical Sciences, Federal University of Technology, Owerri Imo State, Nigeria.
[3]
Akalezi O. Chris, Department of Chemistry, School of Physical Sciences, Federal University of Technology, Owerri Imo State, Nigeria.
Abstract
The potential of raw corn cobs (RCC) powder, for the removal of methylene blue (MB) dye from aqueous solution was investigated. The adsorbent was characterized by FTIR and SEM analysis. Batch adsorption studies were conducted and various parameters such as contact time, adsorbent dosage, initial dye concentration, pH and temperature were studied to observe their effects in the dye adsorption process. The optimum conditions for the adsorption of MB onto the adsorbent (RCC) was found to be: contact time (30mins), pH (10.0) and temperature (343K) for an initial MB dye concentration of 100mg/l and adsorbent dose 1.0g. The experimental equilibrium adsorption data fitted best and well to the Freundlich and Halsey isotherm models. The maximum adsorption capacity was found to be 18.28mg/g. The kinetic data conformed to the pseudo-second-order kinetic model, suggesting that the rate limiting step may be chemisorptions. Adsorption mechanism was investigated with intra-particle diffusion model and it indicated that intra-particle diffusion was not the rate determining step. Thermodynamic quantities such as Gibbs free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) were evaluated. The negative values of ΔG0 and the positive value of ΔH0 obtained indicated the spontaneous and endothermic nature of the adsorption process while the positive ΔS0 value obtained indicated increased randomness during the adsorption process.
Keywords
Adsorption, Methylene Blue, Corn Cobs Powder, Kinetics, Thermodynamics
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