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Competitive Adsorption of Cd and Dyes to Kaolinite

Published online by Cambridge University Press:  01 January 2024

Rodney G. Harris ,
Bruce B. Johnson  and
John D. Wells
Rodney G. Harris*
Affiliation:
Colloid and Environmental Chemistry Laboratory, La Trobe University, PO Box 199, Bendigo, Victoria 3552, Australia
Bruce B. Johnson
Affiliation:
Colloid and Environmental Chemistry Laboratory, La Trobe University, PO Box 199, Bendigo, Victoria 3552, Australia
John D. Wells*
Affiliation:
Colloid and Environmental Chemistry Laboratory, La Trobe University, PO Box 199, Bendigo, Victoria 3552, Australia
*
†Present address: Brewing Research International, Lyttel Hall, Nutfield, Surrey RH1 4HY, UK
*E-mail address of corresponding author: [email protected]
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Abstract

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The competitive adsorption to kaolinite between Cd(II) and four polyaromatic dyes (9-aminoacridine, 3,6-diaminoacridine, azure A and safranin O) was studied in 5 mM KNO3 at 25°C. Under these conditions, Cd adsorbs to the silica face of kaolinite between about pH 4 and 6.5, but at higher pH, adsorbed Cd is progressively relocated to the crystal edges. In the presence of dye, less Cd adsorbed to kaolinite below pH 7. If sufficient dye was added to saturate the kaolinite surface, Cd adsorption was totally suppressed up to ∼pH 6. At higher pH, Cd followed the characteristic pattern for edge adsorption. In separate experiments 9-aminoacridine and azure A displaced pre-adsorbed Cd from kaolinite. The displacement curves were initially linear, with one Cd ion being displaced for every 13 dye molecules adsorbed at pH 5.5, and one Cd ion for every 35 dye molecules at pH 7.5. The interpretation of these results is that the dyes bind to kaolinite much more strongly than Cd(II) does, but only to the silica face.

Keywords

9-aminoacridine3,6-diaminoacridineAzure AClayDisplacementDyeIsothermKaolinSafranin O
Type
Research Article
Information
Clays and Clay Minerals , Volume 54 , Issue 4 , August 2006 , pp. 449 - 455
Copyright
Copyright © 2006, The Clay Minerals Society

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