Infrared spectroscopic study of potassium and cesium acetate-intercalated kaolinites

Ray L. Frost, Oliver B. Locos, Janos Kristof, J. Theo Kloprogge

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Near-IR spectroscopy has been used to elucidate the structure of potassium and cesium acetate-intercalated kaolinites. Three near-IR spectral regions are identified: (a) the high frequency region between 6400 and 7400cm-1 attributed to the first overtone of the hydroxyl stretching mode, (b) the 4800-5400cm-1 region attributed to water combination modes and (c) the 4000-4800cm-1 region attributed to the combination of the stretching and deformation modes of the AlOH units of kaolinite. The technique of near-IR spectroscopy for the study of intercalated kaolinites shows great potential for the understanding of the interactions between the surface hydroxyls of kaolinite and the inserting potassium and acetate ions. In particular, whereas the overlap of the hydroxyl stretching frequencies of water and the kaolinite overlap in the mid-IR, such overlap does not occur in the near-IR. In the first overtone region, a single sharp band is observed at 7045cm-1 which is assigned to the combination of the hydroxyl stretching frequencies of the inner surface hydroxyls and water. Such an observation supports the concept of an interaction between the water and the inner surface hydroxyls of the intercalated kaolinite. It is suggested that the bonding of the acetate to the kaolinite hydroxyls is through the water molecule.

Original languageEnglish
Pages (from-to)33-42
Number of pages10
JournalVibrational Spectroscopy
Volume26
Issue number1
DOIs
Publication statusPublished - Dec 1 2001

Keywords

  • Infrared spectroscopy
  • Intercalation
  • Kaolinite
  • Near-infrared spectroscopy
  • Potassium acetate

ASJC Scopus subject areas

  • Spectroscopy

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