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Cation exchange reactions of vermiculite with Cu-triethylenetetramine as affected by mechanical and chemical pretreatment

Published online by Cambridge University Press:  01 January 2024

Annett Steudel ,
Peter G. Weidler ,
Rainer Schuhmann  and
Katja Emmerich
Annett Steudel*
Affiliation:
Competence Center for Material Moisture (CMM), University Karlsruhe c/o IFG, Forschungszentrum Karlsruhe Germany Institute of Functional Interfaces, (IFG), Forschungszentrum Karlsruhe GmbH, Hermann-von-Helmholtz-Platz 1 D-76344 Eggenstein-Leopoldshafen Germany
Peter G. Weidler
Affiliation:
Institute of Functional Interfaces, (IFG), Forschungszentrum Karlsruhe GmbH, Hermann-von-Helmholtz-Platz 1 D-76344 Eggenstein-Leopoldshafen Germany
Rainer Schuhmann
Affiliation:
Competence Center for Material Moisture (CMM), University Karlsruhe c/o IFG, Forschungszentrum Karlsruhe Germany Institute of Functional Interfaces, (IFG), Forschungszentrum Karlsruhe GmbH, Hermann-von-Helmholtz-Platz 1 D-76344 Eggenstein-Leopoldshafen Germany
Katja Emmerich
Affiliation:
Competence Center for Material Moisture (CMM), University Karlsruhe c/o IFG, Forschungszentrum Karlsruhe Germany Institute of Functional Interfaces, (IFG), Forschungszentrum Karlsruhe GmbH, Hermann-von-Helmholtz-Platz 1 D-76344 Eggenstein-Leopoldshafen Germany
*
aannett.steudel@kit.edu
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Abstract

The cation exchange capacity (CEC) is a characteristic property of expandable clay minerals, such as smectites and vermiculites. The aim of this work was to examine the cation exchange behavior of vermiculite using the Cu-triethylenetetramine (Cu-trien) CEC method and the influence of mechanical and chemical pretreatment, with the ammonium acetate method serving as a reference. The Cu-trien method makes rapid and direct CEC measurements possible. Three different kinds of mill were used to grind a vermiculite sample from Russia, in order to reduce the particle size to <10 µm. The Netzsch CGS 10 dry mill reduced the particle size more effectively than the other grinding methods. Chemical pretreatments were used to remove carbonates, organic matter, Fe oxides, and divalent exchangeable cations from vermiculite samples prior to CEC measurements. Subsamples of ground and chemically pretreated vermiculite samples were saturated with Na, Li, Mg, Ca, and Cu cations to determine the effect of exchangeable cations on measured CEC values. Chemical pretreatment, monovalent cation pretreatment, and 48 h of shaking time were needed to measure vermiculite CEC values effectively using the Cu-trien method.

Keywords

Ammonium AcetateCation Exchange CapacityCu-triethylenetetramineGrindingVermiculite

Information

Type
Article
Information
Clays and Clay Minerals , Volume 57 , Issue 4 , August 2009 , pp. 486 - 493
Copyright
© The Clay Minerals Society 2009

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