Synthesis and Sorption Studies of Lead (II) on Zn/Fe Layered Double Hydroxide
American Journal of Applied Chemistry
Volume 3, Issue 3, June 2015, Pages: 124-133
Received: Apr. 22, 2015; Accepted: Apr. 27, 2015; Published: May 11, 2015
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Authors
Ayawei N., Department of Chemical Sciences, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria
Inengite A. K., Department of Chemical Sciences, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria
Wankasi D., Department of Chemical Sciences, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria; Applied Chemistry and Nanoscience Laboratory, Department of Chemistry, Vaal University of Technology, Vanderbijlpark, South Africa
Dikio E. D., Department of Chemical Sciences, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria; Applied Chemistry and Nanoscience Laboratory, Department of Chemistry, Vaal University of Technology, Vanderbijlpark, South Africa
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Abstract
Zn/Fe-CO3 layered double hydroxide was synthesis by co-precipitation method for the adsorption of lead ions in aqueous solution. The synthesized layered double hydroxide (Zn/Fe-CO3) was then characterized by Powder X-ray Diffraction (PXRD), Fourier Transform Infrared (FT-IR) and SEM/EDX analysis. The experimental data fitted both Langmuir and Freundlich isotherms with regression correlation coefficient values of 0.9999 and 0.999 respectively. The essential thermodynamic parameters of Ho, So, Hx and Eawere calculated to be -4.8327KJ/mol, 12.8J/molK, 13.3KJ/mol and -1.948KJ/mol, thus showing the exothermic nature of the process and the randomness of the system. The low activation energy (Ea) value is consistent with physical adsorption. The results also fitted zero-order kinetic, first-order kinetic and pseudo-second order models.
Keywords
Thermodynamics, Freundlich Isotherm, Kinetics, Layered Double Hydroxide, Langmuir Isotherm
To cite this article
Ayawei N., Inengite A. K., Wankasi D., Dikio E. D., Synthesis and Sorption Studies of Lead (II) on Zn/Fe Layered Double Hydroxide, American Journal of Applied Chemistry. Vol. 3, No. 3, 2015, pp. 124-133. doi: 10.11648/j.ajac.20150303.15
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