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Dehydroxylation Behavior of Heat-Treated and Steam-Treated Homoionic cis-Vacant Montmorillonites

Published online by Cambridge University Press:  28 February 2024

Katja Emmerich ,
Fritz Thule Madsen  and
Guenter Kahr
Katja Emmerich
Affiliation:
Clay Lab, Institute of Geotechnical Engineering, ETH-Hönggerberg Zurich, CH-8093 Zurich, Switzerland
Fritz Thule Madsen
Affiliation:
Clay Lab, Institute of Geotechnical Engineering, ETH-Hönggerberg Zurich, CH-8093 Zurich, Switzerland
Guenter Kahr
Affiliation:
Clay Lab, Institute of Geotechnical Engineering, ETH-Hönggerberg Zurich, CH-8093 Zurich, Switzerland
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Abstract

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Li+, Na+, Ca2+, Sr2+, Cu2+, or Zn2+-saturated samples of a cis-vacant montmorillonite from Linden, Bavaria, were heated to temperatures between 200–700°C. Half of each heated sample was subsequently autoelaved under steam at 200°C (∼1.5 MPa) to promote rehydroxylation. The smectites were characterized by cation-exchange capacity (CEC), determination of exchangeable cations, infrared (IR) spectroscopy, and thermoanalytical investigations of evolved water in a thermobalance linked with a mass spectrometer.

Changes in the montmorillonite structure and dehydroxylation behavior are related to three respective mechanisms: type of the interlayer cation, interlayer cation radius, and the movement of the interlayer cation. The migration of the smaller Li+, Cu2+, and Zn2+ ions after heating produces a strong reduction of CEC due to the Hofmann-Klemen effect before the initiation of dehydroxylation. Thereafter, the CEC of these smectites remains constant over a large temperature interval during dehydroxylation. After rehydroxylation, Cu2+ and Zn2+-rich samples release 16–23 meq/100 g of Mg2+ from the structure. No Mg2+ release is observed for the Li+-rich montmorillonite. Also the dehydroxylation behavior after rehydroxylation differs between the Cu2+, Zn2+, and Li+-rich samples. The mass curves of the evolved water during thermoanalysis of the rehydroxylated Cu2+ and Zn2+-rich smectites show a peak doublet between 480–700°C. For the Li+, Na+, Ca2+, and Sr2+-rich montmorillonites, the second peak disappeared and a third peak at ∼760°C developed after rehydroxylation. The resulting structure after rehydroxylation of all samples is celadonite-like.

Keywords

CeladoniteCis-Vacant OctahedraDehydroxylationHomoionic MontmorilloniteMass SpectrometryRehydroxylationThermogravimetryTrans-Vacant Octahedra
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 5 , October 1999 , pp. 591 - 604
Copyright
Copyright © 1999, The Clay Minerals Society

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