Mechanochemical treatment of kaolinite

Ray L. Frost, E. Makó, J. Kristóf, E. Horváth, J. Theo Kloprogge

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

Kaolinite surfaces were modified by mechanochemical treatment for periods of time up to 10 h. X-ray diffraction shows a steady decrease in intensity of the d(001) spacing with mechanochemical treatment, resulting in the delamination of the kaolinite and a subsequent decrease in crystallite size with grinding time. Thermogravimetric analyses show the dehydroxylation patterns of kaolinite are significantly modified. Changes in the molecular structure of the kaolinite surface hydroxyls were followed by infrared spectroscopy. Hydroxyls were lost after 10 h of grinding as evidenced by a decrease in intensity of the OH stretching vibrations at 3695 and 3619 cm-1 and the deformation modes at 937 and 915 cm-1. Concomitantly an increase in the hydroxyl stretching vibrations of water is found. The water-bending mode was observed at 1650 cm-1, indicating that water is coordinating to the modified kaolinite surface. Changes in the surface structure of the OSiO units were reflected in the SiO stretching and OSiO bending vibrations. The decrease in intensity of the 1056 and 1034 cm-1 bands attributed to kaolinite SiO stretching vibrations were concomitantly matched by the increase in intensity of additional bands at 1113 and 520 cm-1 ascribed to the new mechanically synthesized kaolinite surface. Mechanochemical treatment of the kaolinite results in a new surface structure.

Original languageEnglish
Pages (from-to)458-466
Number of pages9
JournalJournal of Colloid and Interface Science
Volume239
Issue number2
DOIs
Publication statusPublished - Jul 15 2001

Fingerprint

Kaolin
kaolinite
Kaolinite
Stretching
Hydroxyl Radical
grinding
Surface structure
vibration
Water
water
bending vibration
Crystallite size
Delamination
Molecular structure
Infrared spectroscopy
molecular structure
infrared spectroscopy
spacing
X ray diffraction

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

Mechanochemical treatment of kaolinite. / Frost, Ray L.; Makó, E.; Kristóf, J.; Horváth, E.; Kloprogge, J. Theo.

In: Journal of Colloid and Interface Science, Vol. 239, No. 2, 15.07.2001, p. 458-466.

Research output: Contribution to journalArticle

Frost, Ray L. ; Makó, E. ; Kristóf, J. ; Horváth, E. ; Kloprogge, J. Theo. / Mechanochemical treatment of kaolinite. In: Journal of Colloid and Interface Science. 2001 ; Vol. 239, No. 2. pp. 458-466.
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