Affordable Access

Publisher Website

Calcium sorption on hydroxyapatite in aqueous solutions: reversible and nonreversible components

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
258
Issue
1
Identifiers
DOI: 10.1016/s0021-9797(02)00178-9
Keywords
  • Adsorption And Deposition

Abstract

Abstract The sorption and desorption of calcium were studied on hydroxyapatite (Ca 10(PO 4) 6(OH) 2) in 0.01 M Ca(ClO 4) 2 aqueous solutions at 25 °C in the pH range 4.5–11.5, under conditions of solubility equilibrium. Thus, the isotopic exchange of 45Ca can be utilized to obtain the partition coefficients of calcium on Ca 10(PO 4) 6(OH) 2, whose solubility product was previously estimated from a literature review: log ∗K s 0=−87.2±1.4 . Under these conditions, calcium was partially desorbed from hydroxyapatite particles. The experimental data were analyzed assuming a reversible component of the partition coefficient and a nonreversible sorption component that might result from the polycrystalline nature of the hydroxyapatite particle.

There are no comments yet on this publication. Be the first to share your thoughts.