Study of the adsorption of Co(II) on the chitosan-hydroxyapatite | European Journal of Chemistry

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Published: Jun 30, 2014

DOI: https://doi.org/10.5155/eurjchem.5.2.209-213.948

Keywords:

Cobalt, Kinetics, Chitosan, Adsorption, Hydroxyapatite, Thermodynamics

Section

Research Article

Issue

Vol. 5 No. 2 (2014): June 2014

Dates

Received 2013-10-18
Accepted 2013-12-16
Published 2014-06-30

Zhiguang Ma

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College of Chemistry and Environmental Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Hebei University, Baoding 071002, China

Mengchao Liu

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College of Chemistry and Environmental Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Hebei University, Baoding 071002, China

Jianghong Li

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College of Chemistry and Environmental Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Hebei University, Baoding 071002, China

Yinan Song

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College of Chemistry and Environmental Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Hebei University, Baoding 071002, China

Suwen Liu

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College of Chemistry and Environmental Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Hebei University, Baoding 071002, China

Abstract

The adsorption of cobalt ions (Co²⁺) from aqueous solution onto chitosan-hydroxyapatite composite is investigated in this study. The effects of adsorption time, initial concentration, temperature, and pH are studied in details. Kinetics and thermodynamics of the adsorption of Co²⁺ onto the chitosan-hydroxyapatite are also investigated and the adsorption kinetics is found to follow the pseudo-second-order model with an activation energy (E_a) of 10.73 kJ/mol. Thermodynamic studies indicates that the adsorption follows the Langmuir adsorption equation. The value of entropy change (∆S^ө) and enthalpy change (∆H^ө) are found to be 83.50 and 18.09 kJ/mol, respectively. The Gibbs free energy change (∆G^ө) is found to be negative at all fives temperatures, demonstrating that the adsorption process is spontaneous and endothermic.

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Ma, Z.; Liu, M.; Li, J.; Song, Y.; Liu, S. Study of the Adsorption of Co(II) on the Chitosan-Hydroxyapatite. Eur. J. Chem. 2014, 5, 209-213.

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Supporting Agencies

National Natural Science Foundation of China (Project No, 61001051), the Natural Science Foundation of Hebei Province (Project No, F2011201102)

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