Isotherm Studies of Adsorption of Cr (Vi) Ions onto Coconut Husk
International Journal of Biochemistry, Biophysics & Molecular Biology
Volume 3, Issue 2, June 2018, Pages: 38-44
Received: Mar. 8, 2017; Accepted: Jan. 20, 2018; Published: Aug. 23, 2018
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Egwuatu Chinyelu Ijeamaka, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
Odebeatu Chinonso Christian, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
Obumselu Onyeka Fabian, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
Iloamaeke Ifeoma MaryJane, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
Kammeje Tochukwu Joseph, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
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In this study, the application of ground coconut husk GCH for removal of Cr (VI) from its aqueous solution was investigated. Several batch experiments were carried out with different values of test conditions including sorbent concentration, contact time, temperature and pH. The results obtained showed that adsorption of Cr (VI) followed Freundlich isotherm model. Dubinin-Radushkevich isotherm revealed that adsorption of the three metal ions principally followed chemical adsorption process. Adsorption kinetics was best described by pseudo-second order. Thermodynamic studies revealed that adsorption of Cr (VI) were endothermic process since ∆H was positive. Adsorption of Cr (VI) was spontaneous as evident from the negative value ∆G. Uptake of metal ion from their aqueous solution increases with increase in pH but decreases slightly at pH of 8.
Chromium (VI), Adsorption, Coconut Husk
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Egwuatu Chinyelu Ijeamaka, Odebeatu Chinonso Christian, Obumselu Onyeka Fabian, Iloamaeke Ifeoma MaryJane, Kammeje Tochukwu Joseph, Isotherm Studies of Adsorption of Cr (Vi) Ions onto Coconut Husk, International Journal of Biochemistry, Biophysics & Molecular Biology. Vol. 3, No. 2, 2018, pp. 38-44. doi: 10.11648/j.ijbbmb.20180302.13
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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