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Metachromasy in clay-dye systems: the adsorption of acridine orange by Na-saponite

Published online by Cambridge University Press:  09 July 2018

D. Garfinkel-Shweky  and
S. Yariv
D. Garfinkel-Shweky
Affiliation:
Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
S. Yariv
Affiliation:
Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
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Abstract

The adsorption of the cationic dye acridine orange (AO) by Na-saponite and the colloidal properties of the aqueous suspension were investigated by visible spectroscopy and XRD. The organic cation is adsorbed by the mechanism of cation exchange. When small amounts of the dye are adsorbed, the system contains small tactoids and is peptized. At this stage the dye penetrates into the interlayer space and most of it undergoes metaehromasy due to interactions between the aromatic entity and the oxygen plane of the clay. When greater amounts of AO are adsorbed, the clay platelets flocculate to form book-house floes which, with excess AO, are transformed into card-house floes. At this stage metachromasy results from the aggregation of the dye in the interparticle space of the floes, in addition to the π interactions with the oxygen plane. In excess AO, the clay is gradually peptized. At this stage the dispersed clay platelets form small tactoids with monomeric AO in the interlayer space and at the same time adsorb dimerie and polymeric AO cationic species at the solidliquid interface.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 4 , December 1997 , pp. 653 - 663
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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