Effect of Co (II) ions adsorption in the hydroxyapatite/aqueous NaClO4 solution system on particles electrokinetics
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Dept. Radiochemistry and Colloid Chemistry, Maria Curie Sklodowska University
Władysław Janusz   

Dept. Radiochemistry and Colloid Chemistry, Maria Curie Sklodowska University, Pl. M. Curie Sklodowskiej 3, 20-032 Lublin, Poland
Publication date: 2017-07-01
Physicochem. Probl. Miner. Process. 2018;54(1):31–39
A study of the kinetics and statics of cobalt adsorption at the hydroxyapatite/electrolyte interface using radioactive isotope 60Co was conducted. The course of adsorption kinetics indicates that at the beginning adsorption proceeds quickly and then slowly. Such adsorption kinetics is best described by a multiexpotential equation. The analysis of cobalt adsorption as a function of pH and the results of H+ ions desorption /adsorption confirmed that cobalt adsorption proceeds due to ion exchange with calcium ions in the crystal lattice and hydrogen ions in the surface groups of hydroxyapatite. Cobalt ions adsorption results in the increase of the electrokinetic potential but for the solution of the initial concentration of 0.001 mol/dm3 at pH=8.17 a reversal of the charge due to overloading of the compact layer edl is observed.