2026-04-10T11:51:59Z https://www.eurjchem.com/index.php/eurjchem/oai

oai:ojs.www.eurjchem.com:article/948 2014-06-30T08:07:06Z eurjchem:ART driver

Study of the adsorption of Co(II) on the chitosan-hydroxyapatite Ma, Zhiguang Liu, Mengchao Li, Jianghong Song, Yinan Liu, Suwen Cobalt Kinetics Chitosan Adsorption Hydroxyapatite Thermodynamics 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 (Ea) of 10.73 kJ/mol. Thermodynamic studies indicates that the adsorption follows the Langmuir adsorption equation. The value of entropy change (∆Sө) and enthalpy change (∆Hө) are found to be 83.50 and 18.09 kJ/mol, respectively. The Gibbs free energy change (∆Gө) is found to be negative at all fives temperatures, demonstrating that the adsorption process is spontaneous and endothermic.  Atlanta Publishing House LLC 2014-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/948 10.5155/eurjchem.5.2.209-213.948 European Journal of Chemistry; Vol. 5 No. 2 (2014): June 2014; 209-213 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/948/pdf_948