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Time-dependent changes of adsorption and wetting properties of pillared montmorillonites

I. Dekany, V. Seefeld and G. Lagaly
Time-dependent changes of adsorption and wetting properties of pillared montmorillonites
Clay Minerals (December 2000) 35 (5): 763-769

Abstract

The changes of adsorption properties of uncalcined Al-pillared montmorillonite were studied. A soda-activated bentonite from Slovakia was reacted with polymeric hydroxoaluminium salt solutions. During storage in air at room temperature for three years, the basal spacing decreased by 0.15-0.2 nm; the specific surface area was reduced by 80% and the total pore volume by 40-60%. Adsorption experiments from ethanol-cyclohexane mixtures revealed the decreasing adsorption capacity and the increasing hydrophobicity. The changing surface character was also evident in the decrease in enthalpy of immersion in ethanol from 65.3 J/g to 8.3 J/g (sample B) and from 37.8 J/g to 5.2 J/g (sample C). The alteration probably arises from gradual formation of gibbsite-like interlayers and the redistribution of charges.


ISSN: 0009-8558
EISSN: 1471-8030
Coden: CLMIAF
Serial Title: Clay Minerals
Serial Volume: 35
Serial Issue: 5
Title: Time-dependent changes of adsorption and wetting properties of pillared montmorillonites
Affiliation: University of Szeged, Department of Colloid Chemistry, Szeged, Hungary
Pages: 763-769
Published: 200012
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 25
Accession Number: 2002-025248
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Berlin Adlershof e.V., DEU, Federal Republic of GermanyUniversity of Kiel, DEU, Federal Republic of Germany
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200210
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