KIT | KIT-Bibliothek | Impressum | Datenschutz

Adsorption of dissolved aluminum on sapphire-c and kaolinite: Implications for points of zero charge of clay minerals

Lützenkirchen, J. ORCID iD icon 1; Abdelmonem, A. 2; Weerasooriya, R.; Heberling, F. ORCID iD icon 1; Metz, V. 1; Marsac, R. 1
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)
2 Institut für Meteorologie und Klimaforschung – Atmosphärische Aerosolforschung (IMK-AAF), Karlsruher Institut für Technologie (KIT)


We have studied the impact of dissolved aluminum on interfacial properties of two aluminum bearing minerals, corundum and kaolinite. The effect of intentionally adding dissolved aluminum on electrokinetic potential of basal plane surfaces of sapphire was studied by streaming potential measurements as a function of pH and was complemented by a second harmonic generation (SHG) study at pH 6. The electrokinetic data show a similar trend as the SHG data, suggesting that the SHG electric field correlates to zeta-potential. A comparable study was carried out on kaolinite particles. In this case electrophoretic mobility was measured as a function of pH. In both systems the addition of dissolved aluminum caused significant changes in the charging behavior. The isoelectric point consistently shifted to higher pH values, the extent of the shift depending on the amount of aluminum present or added. The experimental results imply that published isoelectric points of clay minerals may have been affected by this phenomenon. The presence of dissolved aluminum in experimental studies may be caused by particular pre-treatment methods (such as washing in acids and subsequent adsorption of dissolved aluminum) or even simply by starting a series of measurements from extreme pH (causing dissolution), and subsequently varying the pH in the very same batch. ... mehr

Volltext §
DOI: 10.5445/IR/1000046385
DOI: 10.1186/1467-4866-15-9
Zitationen: 25
Web of Science
Zitationen: 23
Zitationen: 25
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Aerosolforschung (IMK-AAF)
Institut für Nukleare Entsorgung (INE)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2014
Sprache Englisch
Identifikator ISSN: 1467-4866
KITopen-ID: 1000046385
HGF-Programm 32.27.01 (POF II, LK 01) Grundlegende Untersuchungen
Erschienen in Geochemical transactions
Verlag Springer Fachmedien Wiesbaden
Band 15
Heft 1
Seiten 9
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagwörter Isoelectric point; Streaming potential; Second harmonic generation; Electrophoretic mobility; Kaolinite; Sapphire; Alumina
Nachgewiesen in Scopus
Web of Science
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page