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Chemisorption of methylene blue by kaolinite*

Published online by Cambridge University Press:  09 July 2018

F. A. Faruqi ,
Susumu Okuda  and
W. O. Williamson
F. A. Faruqi
Affiliation:
West Regional Laboratories, Pakistan Council of Scientific and Industrial Research, Lahore, Pakistan, Kyoto Technical University, Japan
Susumu Okuda
Affiliation:
West Regional Laboratories, Pakistan Council of Scientific and Industrial Research, Lahore, Pakistan, Kyoto Technical University, Japan
W. O. Williamson
Affiliation:
Department of Materials Science, Pennsylvania State University, University Park, Pa., U.S.A.
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Abstract

The chemisorption of methylene blue by kaolinite crystals increased as the aqueous suspensions changed from acid to alkaline because, at high pH values, not only the basal pinacoids but the edge-faces were negatively charged. The inability to calculate acceptable specific surfaces or cation exchange capacities from the chemisorption data is discussed, with special reference to the orientation of adsorbed dye cations, the covering of more than one exchange site by a monomer or polymer, the different concentrations of exchange sites on the basal pinacoids and edge-faces respectively, the possibility that such sites occur on the tetrahedral rather than on the octahedral basal pinacoid, and the incomplete replacement of inorganic cations.

Type
Research Article
Information
Clay Minerals , Volume 7 , Issue 1 , July 1967 , pp. 19 - 31
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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Footnotes

*

Contribution No. 66-33 from the College of Earth and Mineral Sciences, The Pennsylvania State University, University Park, Pa., U.S.A.

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