Isotherms, kinetics, and thermodynamics of methionine adsorption onto poorly crystalline hydroxyapatite with different Ca/P ratios
In: Current Chemistry Letters, Jg. 12 (2023), Heft 4, S. 781-798
Online
academicJournal
Zugriff:
The adsorption properties of hydroxyapatite of low crystallinity towards methionine have been examined. The chemical composition of hydroxyapatite was taken as an experimental variable in order to have a point of view on the parameters of the adsorption process and the mechanisms established between adsorbent-adsorbate. The adsorption kinetics are relatively fast, and the high amounts adsorbed at saturation are obtained for non-stoichiometric hydroxyapatite, containing more HPO42- ions and having a high specific surface area. The good agreement of the experimental data with kinetic models confirms that the mechanism can be perfectly described by pseudo-second-order kinetics. Adsorption isotherm models show that Langmuir's model gives a better fit of experimental data compared to that of Freundlich, Temkin and Dubinin-Kaganer-Radushkevich. Fourier transform infrared spectroscopy confirmed the interaction between the -COO- ions of methionine and the Ca2+ ions of hydroxyapatite. The thermodynamic parameters, the isoelectric point of methionine and the point of zero charge of hydroxyapatite with different Ca/P ratios show that the adsorption process is considered spontaneous, exothermic and often controlled by physisorption with interactions electrostatic.
Titel: |
Isotherms, kinetics, and thermodynamics of methionine adsorption onto poorly crystalline hydroxyapatite with different Ca/P ratios
|
---|---|
Autor/in / Beteiligte Person: | Abdelhadi El Rhilassi ; Oukkass, Oumaima ; Bennani-Ziatni, Mounia |
Link: | |
Zeitschrift: | Current Chemistry Letters, Jg. 12 (2023), Heft 4, S. 781-798 |
Veröffentlichung: | Growing Science, 2023 |
Medientyp: | academicJournal |
ISSN: | 1927-7296 (print) ; 1927-730X (print) |
DOI: | 10.5267/j.ccl.2023.4.003 |
Schlagwort: |
|
Sonstiges: |
|