Abstract
The aim of the study was the basic incidence on the phenomenon of adsorption that occurs at the hydroxyapatite/malic acid interface, leading to a change in the surface properties of hydroxyapatite, Analytical methods used in the research: X-ray diffraction (XRD) as well as by the, adsorption–desorption of nitrogen (ASAP), potentiometric titration. The specific adsorption of malic acid ions at the hydroxyapatite interface was investigated by means of the radioisotope method. The zeta potential of hydroxyapatite dispersions was determined by electrophoresis with Zetasizer Nano ZS90 by Malvern. The particle sizes of hydroxyapatite samples were analyzed using Masteriszer 2000 Malvern. Studies on the kinetics of malic acid on hydroxyapatite from a solution with an initial concentration of 1 mmol/dm3 have shown that the adsorption process is initially fast, followed by a slow adsorption step. An increase in the pH of the solution causes a decrease in the malic acid adsorption as a result of competition with hydroxyl ions. The presence of adsorbed malic acid was confirmed by the FTIR measurements. The effect of malic acid adsorption on the zeta potential and particle size distribution of hydroxyapatite in the NaCl solution was investigated.
Highlights
Hydroxyapatite, when contacting ions or molecules in the environment in which it is located, changes its properties as a result of the adsorption of these components
Malic acid occurs in foods
The studies of malate ions adsorption on hydroxyapatite were carried out using the commercial sample of hydroxyapatite supplied by Aldrich
Summary
Hydroxyapatite, when contacting ions or molecules in the environment in which it is located, changes its properties as a result of the adsorption of these components. The kinetics of adsorption/desorption of malate ions from a solution with an initial concentration of 1 μmol/dm3 on hydroxyapatite is similar to that of tartrate ions (Janusz and Skwarek 2020).
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