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URN: urn:nbn:de:swb:90-463858
DOI: 10.1186/1467-4866-15-9
Zitationen: 14
Web of Science
Zitationen: 12

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

Lützenkirchen, J.; Abdelmonem, A.; Weerasooriya, R.; Heberling, F.; Metz, V.; Marsac, R.

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 washin ... mehr

Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Nukleare Entsorgung (INE)
Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1467-4866
KITopen ID: 1000046385
HGF-Programm 32.27.01; LK 01
Erschienen in Geochemical transactions
Band 15
Heft 1
Seiten 9
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte Isoelectric point; Streaming potential; Second harmonic generation; Electrophoretic mobility; Kaolinite; Sapphire; Alumina
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