Water adsorption properties of alumina pillared clay

S. Yamanaka, P. B. Malla, S. Komarneni

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Abstract

Interlayers of montmorillonite were pillared with aluminum oxide and the water adsorption isotherms were measured on the samples calcined at temperatures ranging from 200 to 600°C. Although the nitrogen adsorption isotherms on the same samples were of the extreme Type I for Brunauer classification, the water adsorption isotherms did not fit either the Langmuir or the BET adsorption equations. The unusual shape of the isotherms can be interpreted in terms of hydrophobicity of the alumina pillared clays. The t-plot analysis of the adsorption isotherms revealed that the micropore filling with water was suppressed in the very low pressure region. From the t-plots, the slitwidth of the interlayer pores was estimated to be 7-8 Å, in good agreement with the pillar height obtained from the basal spacing. The low BET c-constant and the small isosteric heats of adsorption of water also suggest that the alumina pillared clays have hydrophobic properties.

Original languageEnglish (US)
Pages (from-to)51-58
Number of pages8
JournalJournal of Colloid And Interface Science
Volume134
Issue number1
DOIs
StatePublished - Jan 1990

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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