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Authors: BOGYA ERZSÉBET SÁRA, IOAN BÂLDEA, BARABÁS RÉKA, ALEXANDRA CSAVDÁRI, GRAZIELLA L. TURDEAN, VALENTINA ROXANA DEJEU.
A study on the removal of copper ions from aqueous solutions by synthetic hydroxyapatite and structurally modified apatite has been carried on under batch conditions. The influence of different sorption parameters, such as heat treatment of the material, particle size, initial metal ion concentration and temperature has been studied and discussed. Maximum adsorption capacity and efficiency were determined. The results showed that the removal efficiency of Cu(II) by hyrdoxyapatite containing silica (HAP-Si) could reach 99.7%, when the initial Cu(II) concentration was 5 mM. The mechanism of the sorption process was studied, by employing pseudo-first, pseudo-second-order kinetic models and intraparticle diffusion model. Activation energy for hydroxyapatite and 10%wt silica doped hydroxyapatite was obtained, considering pseudo-second-order kinetics model.
Keywords: hydroxyapatite, modified hydroxyapatite, copper removal, kinetics, diffusion, activation energy
