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Mineralogy, chemical characteristics and stabilities of Cetylpyridinium-exchanged smectite

Published online by Cambridge University Press:  09 July 2018

S. M. Koh ,
M. S. Song  and
T. Takagi
S. M. Koh*
Affiliation:
Geology and Geoinformation Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 305-350, Korea
M. S. Song
Affiliation:
Geology and Geoinformation Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 305-350, Korea
T. Takagi
Affiliation:
Research Center for Deep Geological Environments, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki 305-8567, Japan
*
*E-mail: [email protected]
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Abstract

CP (Cetylpyridinium)-exchanged smectite was manufactured by the cationic exchange reaction of Na-smectite with CP. The adsorption behaviour shows a typical L-type isotherm representing continuous and stable adsorption in excess of twice the cation exchange capacity of CP. CP-smectite shows a strong interlayer (d001) expansion to 40.2 Å when an amount of CP equivalent to 140% of the CEC is exchanged into smectite. CP-smectite is characterized by strong alkalinity (pH 9.3), low swelling (4.5 ml/2 g), low viscosity (3.9 mPa s), and strong and fast flocculation. These characteristics are in striking contrast to Na-smectite except for the alkalinity. CP-smectite shows no signs of desorption of the organic species under varying pH conditions (pH 2–12). Desorption is slight even when washed three times with DH2O (distilled water). Pyrolysis of CP-smectite begins at 250°C and ends at 400°C. These stable and persistent characteristics and the relatively low price of CP point to the likely increased use of CP-smectite as an organoclay.

Keywords

Cetylpyridinium (CP)smectiteinterlayer expansionstabilitypyrolysisindustrial use
Type
Research Article
Information
Clay Minerals , Volume 40 , Issue 2 , June 2005 , pp. 213 - 222
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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