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GEOREF RECORD

The interaction between bentonite and water vapor; I, Examination of physical and chemical properties

Michel Heuser, Christian Weber, Helge Stanjek, Hong Chen, Guntram Jordan, Wolfgang W. Schmahl and Carsten Natzeck
The interaction between bentonite and water vapor; I, Examination of physical and chemical properties
Clays and Clay Minerals (June 2014) 62 (3): 188-202

Abstract

The influence of water vapor on bentonites or smectites is of interest in many different fields of applied mineralogy such as nuclear-waste sealing or casting in the foundry industry. The water vapor affects the smectite surface and perhaps its structure probably leading to mostly unfavorable changes in its properties. In this first part of the present study, the influence of hot water vapor (200 degrees C) on the physicochemical and mineralogical properties of smectite-group minerals was studied. After the steam treatment, turbidity measurements, methylene-blue sorption, water adsorption, and cation exchange capacity (CEC) were measured on both untreated and treated samples. Mineralogical changes were monitored by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) was used to measure O, Al, and Si. Only a few parameters showed differences between the untreated and vapor-treated samples. Sedimentation volumes (SV) decreased following the treatment. As shown by XRD and XPS, the crystalline structure of smectite remained unaffected by the steam treatment. Equivalent sphere diameters (ESD) were not affected systematically by the steam treatment. Differences in CEC values between untreated and treated samples were observed, but only for smectites with monovalent interlayer cations. From the variety of different measurements the conclusion of the present study was that steam treatment changes the charge properties at or near the smectite particle surface.


ISSN: 0009-8604
EISSN: 1552-8367
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 62
Serial Issue: 3
Title: The interaction between bentonite and water vapor; I, Examination of physical and chemical properties
Affiliation: RWTH Aachen University, Clay and Interface Mineralogy, Aachen, Germany
Pages: 188-202
Published: 201406
Text Language: English
Publisher: Clay Minerals Society, Chantilly, VA, United States
References: 68
Accession Number: 2014-091561
Categories: Sedimentary petrologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Flemish Institute for Technological Research, BEL, BelgiumLudwig-Maximilians-Universitaet Muenchen, DEU, GermanyKarlsruhe Institute of Technology, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Clay Minerals Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201447
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