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A study of hydroxyl groups in kaolin minerals utilizing selective deuteration and infrared spectroscopy

Published online by Cambridge University Press:  09 July 2018

Koji Wada*
Faculty of Agriculture, Kyushu University, Fukuoka, Japan


The OH-OD exchange of kaolin minerals through contact with D2O introduced into interlayer space via intersalation resulted in a partial shift of the OH absorption bands. The total decrease in OH absorbance upon deuteralion was 52, 56, and 47% for the kaolinite, dickite-nacrite, and halloysite respectively, but the percentage decrease differed for the different absorption maxima of any one mineral. A secondary OH—OD exchange in the deuterated specimens was also observed upon heating to 350 and 400° C. These data together with the lack of deuteration in montmorillonite, and available orientation data on the kaolin OH groups by infrared spectroscopy, suggest that only two-thirds of the inner-surface OH groups form the interlayer OH—O bonds.

Research Article
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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