Modification of the hydroxyl surface of kaolinite through mechanochemical treatment followed by intercalation with potassium acetate

Frost, Ray L., Kristof, Janos, Mako, Eva, & Martens, Wayde N. (2002) Modification of the hydroxyl surface of kaolinite through mechanochemical treatment followed by intercalation with potassium acetate. Langmuir, 18(17), pp. 6491-6498.

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Changes in the hydroxyl surfaces of kaolinite have been studied through mechanochemical activation followed by intercalation with potassium acetate using a combination of X-ray diffraction and DRIFT spectroscopy. X-ray diffraction shows that in the absence of air the intercalated kaolinite is expanded to 11.9Å with an additional expanded phase at 9.07Å. The degree of expansion is related to the orientation of the acetate between the kaolinite layers. Upon exposure to moist air the kaolinite re-expands to 14.2 and 10.02Å. Upon mechanochemical activation of the kaolinite for 1 hour and intercalation with potassium acetate, a phase with a d-spacing of 8.80Å is obtained which upon exposure to moist air re-expands to 13.50Å.
Changes in the molecular structure of the mechanochemically activated intercalated kaolinite were followed by DRIFT spectroscopy. Fundamentally the intensity of the kaolinite hydroxyl stretching bands decreased exponentially with grinding time and concomitantly the intensity of the bands attributed to the OH stretching vibrations of water increased. It is proposed that the mechanochemically activation of the kaolinite caused the conversion of the hydroxyls to water which coordinates the kaolinite surface. Significant changes in the infrared bands assigned to the hydroxyl deformation and translation modes were observed. The intensity decrease of the bands was linearly related to the grinding time.

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ID Code: 3850
Item Type: Journal Article
Refereed: Yes
Additional Information: This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record.
Additional URLs:
Keywords: Kaolinite, intercalation, mechanochemical activation, XRD, Raman microscopy, DRIFT spectroscopy
DOI: 10.1021/la0201422
ISSN: 0743-7463
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2002 American Chemical Society
Copyright Statement: The contents of this journal can be freely accessed online via the ACS web page 12 months after publication. See link to ACS website.
Deposited On: 15 Sep 2006 00:00
Last Modified: 10 Aug 2011 15:51

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