An inverse gas chromatographic study of the adsorption of alkanes on hydroxyapatite.
In: Journal of Materials Science, Jg. 35 (2000-06-01), Heft 11, S. 2825-2828
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Zugriff:
Saturated alkanes adsorption on synthetic well-crystallized hydroxyapatite was studied by the inverse gas chromatography method, at zero coverage. Hydroxyapatite was prepared from Ca(OH) 2 and H 3 PO 4 aqueous solutions by a slow titration technique. The powder was characterized by XR diffraction, surface area measurement, and chemical analysis. Adsorption of saturated alkanes was investigated in the temperature range 338–353 K, using a flame ionization detector, and nitrogen as a carrier gas. The gas/solid partition coefficients were calculated from the retention data as well as the standard thermodynamic functions of adsorption, ΔH 0 d , ΔS 0 a and ΔG 0 a . Linear relationships between lnK and 1/T and between ΔG 0 a and the number of carbon atoms in saturated alkanes were observed. The dispersive component of the surface free energy was calculated for the investigated temperature region. A possible analytical application of hydroxyapatite to n-alkanes separation is given. [ABSTRACT FROM AUTHOR]
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Titel: |
An inverse gas chromatographic study of the adsorption of alkanes on hydroxyapatite.
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Autor/in / Beteiligte Person: | Smičiklas, I. ; Milonjić, S. ; Zec, S. |
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Zeitschrift: | Journal of Materials Science, Jg. 35 (2000-06-01), Heft 11, S. 2825-2828 |
Veröffentlichung: | 2000 |
Medientyp: | academicJournal |
ISSN: | 0022-2461 (print) |
DOI: | 10.1023/A:1004795019433 |
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