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The acidity of surface groups of dioctahedral smectites

Published online by Cambridge University Press:  09 July 2018

S. Kaufhold ,
H. Stanjek ,
D. Penner  and
R. Dohrmann
S. Kaufhold*
Affiliation:
BGR, Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655, Hannover, Germany
H. Stanjek
Affiliation:
Clay and Interface Mineralogy, RWTH Aachen University, Bunsenstr. 8, D-52072 Aachen, Germany
D. Penner
Affiliation:
ZHAW Zürich University of Applied Sciences, CH-8401 Winterthur, Switzerland
R. Dohrmann
Affiliation:
LBEG, Landesamt für Bergbau, Energie und Geologie, Stilleweg 2, D-30655, Hannover, Germany
*
*E-mail: s.kaufhold@bgr.de
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Abstract

Suspensions of thirty six bentonites were equilibrated for 24 h and then adjusted to pH 3. After an hour, pH titrations up to pH 12 at varying ionic strengths were performed within 4.5 h. The titration data were recalculated into proton affinity distributions (PAD) using the condensed approximation. In spite of widely varying chemical compositions, all bentonites showed a protonation reaction between pK 4 and 5, which could be assigned to aluminol groups at the edge surfaces of the smectites. The average pK is 4.73±80.31. A second prominent peak in the PAD at pK = 10.43±80.13 could be assigned to exchangeable Mg2+ in the interlayer space. The possibility to constrain both pK values at a fixed average value will decrease the number of parameters in surface complexation modelling and thus enhance its convergence.

Keywords

smectitesurface acidityaluminol groupdioctahedral smectitepotentiometric titrationcondensed approximation
Type
Research Article
Information
Clay Minerals , Volume 46 , Issue 4 , December 2011 , pp. 583 - 592
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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