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Kaolinite-potassium acetate and halloysite-potasium acetate complexes prepared by mechanochemical, solution and homogenization techniques: a comparative study

Published online by Cambridge University Press:  27 February 2018

É. Mako ,
A. Kovács ,
E. Horváth  and
J. Kristóf
É. Mako*
Affiliation:
Institute of Materials Engineering, University of Pannonia, H-8201 Veszprém, P.O. Box 158, Hungary
A. Kovács
Affiliation:
Institute of Materials Engineering, University of Pannonia, H-8201 Veszprém, P.O. Box 158, Hungary
E. Horváth
Affiliation:
Institute of Environmental Engineering, University of Pannonia, H-8201 Veszprém, P.O. Box 158, Hungary
J. Kristóf
Affiliation:
Institute of Chemistry, University of Pannnonia, H-8201 Veszprém, P.O. Box 158, Hungary
*
*E-mail: makoe@almos.vein.hu
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Abstract

Kaolinite- and halloysite-potassium acetate complexes were synthesized by cogrinding with solid potassium acetate (mechanochemical intercalation). The efficiency of mechanochemical intercalation was compared to the intercalation in solution and by homogenization. The effects of ageing and grinding parameters (grinding time, sample:grinding body mass ratio (SGMR), rotational speed) and the humidity on the intercalation were studied. The degree of intercalation increased exponentially with ageing of the samples prepared by mechanochemical and homogenization techniques. For the mechanochemical and homogenization techniques the required amount of potassium acetate per gram of kaolin (∼0.4 g/g) was two orders of magnitude lower than that for the solution intercalation (78.6 g/g). The highest degree of intercalation (86%) and the lowest structural deformation were achieved by the mechanochemical method (¼ h of co-grinding with 1:2 SGMR at 300 rpm), followed by 16 h ageing at 57% relative humidity.

Keywords

grindingintercalationkaolinitehalloysitemechanochemicalhomogenizationpotassium acetate
Type
Research Article
Information
Clay Minerals , Volume 49 , Issue 3 , June 2014 , pp. 457 - 471
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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