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Charging Behavior of Clays and Clay Minerals in Aqueous Electrolyte Solutions — Experimental Methods for Measuring the Charge and Interpreting the Results

Preocanin, T.; Abdelmonem, Ahmed; Montavon, G.; Lützenkirchen, Johannes

Abstract (englisch):
We discuss the charging behavior of clays and clay minerals in aqueous electrolyte solutions. Clay platelets exhibit different charging mechanisms on the various surfaces they expose to the solution. Thus, the basal planes have a permanent charge that is typically considered to be independent of pH, whereas the edge surfaces exhibit the amphoteric behavior and pH-dependent charge that is typical of oxide minerals. Background electrolyte concentration and composition may affect these two different mechanisms of charging in different ways. To guide and to make use of these unique properties in technical application, it is necessary to understand the effects of the various master variables (i.e. pH and background salt composition and concentration). However, how to disentangle the various contributions to the charge that is macroscopically measurable via conventional approaches (i.e. electrokinetics, potentiometric titrations, etc.) remains a challenge. The problem is depicted by discussing in detail the literature data on kaolinite obtained with crystal face specificity. Some results from similar experiments on related substrates are also discussed. ... mehr

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Volltext §
DOI: 10.5445/IR/1000053452
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Buchaufsatz
Jahr 2016
Sprache Englisch
Identifikator ISBN: 978-953-51-2259-3
KITopen-ID: 1000053452
HGF-Programm 12.01.01 (POF III, LK 01)
Erschienen in Clays, Clay Minerals and Ceramic Materials Based on Clay Minerals. Ed.: G.M. do Nascimento
Verlag InTech, Rijeka (CRO)
Seiten 51-88
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte Mass titration, clay mineral, montmorillonite, smectite, adsorption, acid-base properties, surface charge
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