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Vol. 27 No. 12 (2015): Vol 27 Issue 12

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Adsorption of Copper(II) from Aqueous Solution by Mg/Fe-Layered Double Hydroxide

https://doi.org/10.14233/ajchem.2015.19166
N. Ayawei
Department of Chemical Sciences, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria
A.O. Osikoya
Applied Chemistry and Nanoscience Laboratory, Department of Chemistry, Vaal University of Technology, P. O. Box X021, Vanderbijlpark, South Africa
A.T. Ekubo
Department of Chemistry, Federal University of Technology, Otuoke, Bayelsa State, Nigeria
D. Wankasi
Applied Chemistry and Nanoscience Laboratory, Department of Chemistry, Vaal University of Technology, P. O. Box X021, Vanderbijlpark, South Africa
E.D. Dikio
Applied Chemistry and Nanoscience Laboratory, Department of Chemistry, Vaal University of Technology, P. O. Box X021, Vanderbijlpark, South Africa

Corresponding Author(s) : N. Ayawei

ayawei4acad@gmail.com

Asian Journal of Chemistry, Vol. 27 No. 12 (2015): Vol 27 Issue 12

Abstract

Layered double hydroxide (LDH), of Mg/Fe ratio 2:1 was synthesized by co-precipitation method and characterized using X-ray diffraction, Fourier transform infrared spectroscopy and field emission scanning electron microscopy/energy-dispersive X-ray spectroscopy (FESEM/EDX). The effects of time, concentration and temperature on the adsorption Cu2+ by the layered double hydroxide were studied. The Freundlich and Langmuir isotherms were plotted with correlation coefficient values of 1 and 0.8747 respectively. The results obtained confirms that Freundlich isotherm model is the most suitable model for the adsorption of copper ions by the layered double hydroxide. The thermodynamic parameters, DH° and DS° were calculated to predict the nature of adsorption. The negative values of DH° (-574 KJ/mol) and the positive values of DS° (18.7 J/mol K) indicate that the adsorption process is spontaneous and exothermic in nature. The adsorption process followed pseudo-second-order kinetics, zero-order kinetic model and second-order kinetic model.

Keywords

Layered double hydroxide Freundlich isotherm Langmuir isotherm Thermodynamics Kinetics
Ayawei, N., Osikoya, A., Ekubo, A., Wankasi, D., & Dikio, E. (2015). Adsorption of Copper(II) from Aqueous Solution by Mg/Fe-Layered Double Hydroxide. Asian Journal of Chemistry, 27(12), 4436–4442. https://doi.org/10.14233/ajchem.2015.19166
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