Modification of kaolinite surfaces through mechanochemical activation with quartz -a DRIFT and chemometrics study
Frost, Ray L., Carmody, Onuma, Kloprogge, J. Theo, Mako, Eva, Kristof, Janos, & Kokot, Serge (2006) Modification of kaolinite surfaces through mechanochemical activation with quartz -a DRIFT and chemometrics study. Applied Spectroscopy, 60(12), pp. 1414-1422.
Studies of kaolinite surfaces are of industrial importance. One useful method for studying the changes in kaolinite surface properties is to apply chemometric analyses to the kaolinite surface infrared spectra. A comparison is made between the mechanochemical activation of Kiralyhegy kaolinites with significant amounts of natural quartz and the mechanochemical activation of Zettlitz kaolinite with added quartz. DRIFT spectra were analysed using, Principal Component Analysis (PCA), and multi-criteria decision making (MCDM) methods, PROMETHEE and GAIA.
The clear discrimination of the Kiralyhegy spectral objects on the two PC scores plots (400-800 and 800-2030 cm-1) indicated the dominance of quartz. Importantly, no ordering of any spectral objects appeared to be related to grinding time in the PC plots of these spectral regions. Thus, neither the kaolinite nor the quartz, are systematically responsive to grinding time according to the spectral criteria investigated. The third spectral region (2600-3800 cm-1 – OH vibrations), showed apparent systematic ordering of the Kiralyhegy and, to a lesser extent, Zettlitz spectral objects with grinding time. This was attributed to the effect of the natural quartz on the delamination of kaolinite and the accompanying phenomena (i.e. formation of kaolinite spheres and water). The mechanochemical activation of kaolinite and quartz, through dry grinding, results in changes to the surface structure. Different grinding times were adopted to study the rate of destruction of the kaolinite and quartz structures. This relationship (i.e. grinding time) was classified using PROMETHEE and GAIA methodology.
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|Item Type:||Journal Article|
|Additional Information:||This paper elucidates the application of chemometrics to the changes in the structure of mechanochemically activated kaolinite|
|Keywords:||kaolinite surfaces, halloysite, chemometrics, PCA, PROMETHEE and GAIA, DRIFT|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2006 Society for Applied Spectroscopy|
|Copyright Statement:||Copyright 2006 by the Society for Applied Spectroscopy. Printing of this material is restricted to a single copy for non-commercial use only and may not be redistributed by electronic or any other means.|
|Deposited On:||08 Jan 2007 00:00|
|Last Modified:||29 Feb 2012 13:23|
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