Use of unmodified orange peel for the adsorption of Cd(II), Pb(II) and Hg(II) ions in aqueous solutions
American Journal of Physical Chemistry
Volume 4, Issue 3, June 2015, Pages: 21-29
Received: Nov. 29, 2014; Accepted: Dec. 9, 2014; Published: Jul. 4, 2015
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Authors
Egwuatu Chinyelu, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, P. M. B. 5025 Awka, Anambra State, South Eastern Nigeria
Umedum Ngozi, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, P. M. B. 5025 Awka, Anambra State, South Eastern Nigeria
Ochiagha Kate, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, P. M. B. 5025 Awka, Anambra State, South Eastern Nigeria
Ogbugo Sixtus, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, P. M. B. 5025 Awka, Anambra State, South Eastern Nigeria
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Abstract
Ground orange peel (GOP) was used as adsorbent for Cd(II), Pb(II) and Hg(II) ions in aqueous solutions. Several experiments with variation of some factors namely: initial concentration of the heavy metal ions, contact time, temperature and pH were carried out. FT-IR spectrum of GOP showed the presence of different functional groups on its surface. Equilibrium data were analysed by Langmuir, Freundlich, and Temkin isotherms. Hg (II) and Cd (II) adsorptions were better described by Temkin isotherm while that of Pub (II) was best described Freundlich isotherm. Pseudo second order kinetics with higher R2 values described adsorption in all cases. Adsorption of Hg (II) was maximum at pH 4, while those of Cd (II) and Pub (II) ions were maximum at pH 6. Thermodynamics study showed that the adsorption processes of Pb(II) and Hg(II) ions were endothermic while that of Cd(II) ions was exothermic in nature.
Keywords
Orange Peels Adsorbent, Adsorption Isotherms, Kinetics, Thermodynamics, pH
To cite this article
Egwuatu Chinyelu, Umedum Ngozi, Ochiagha Kate, Ogbugo Sixtus, Use of unmodified orange peel for the adsorption of Cd(II), Pb(II) and Hg(II) ions in aqueous solutions, American Journal of Physical Chemistry. Vol. 4, No. 3, 2015, pp. 21-29. doi: 10.11648/j.ajpc.20150403.11
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