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Reaction products of organic dye molecules with acid-treated montmorillonite

Published online by Cambridge University Press:  09 July 2018

R. Fahn  and
K. Fenderl
R. Fahn
Affiliation:
Süd-Chemie A.G., Postfach 20 22 40, 8000 München 2, FRG
K. Fenderl
Affiliation:
Süd-Chemie A.G., Postfach 20 22 40, 8000 München 2, FRG
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Abstract

During the reaction of solutions of the leuco dyes crystal violet lactone and N-benzoyl leuco methylene blue with acid-treated montmarillonite (as occurs with carbonless copying papers), most of the offered dye is intercalated within the interlayers of the montmorillonite structure remaining after acid attack. This phenomenon was demonstrated by XRD and also by high-resolution transmission electron microscopy. During acid treatment, octahedral cations are dissolved from exposed edges of the montmorillonite lamellae and amorphous silica builds up in these areas. As a result, the BET(N2) specific surface area increases from ∼60 m2/g to ∼300 m2/g and, consequently, the theoretical reactivity towards leuco dyes. Nevertheless, only small quantities of the dye molecules are adsorbed onto the amorphous silica. The excellent colour intensity and, in particular, the resistance to fading in the light of the montmorillonite dye complexes may be explained by the protected position of the dye molecules within the interlayers of the montmorillonite.

Information

Type
Research Article
Information
Clay Minerals , Volume 18 , Issue 4 , December 1983 , pp. 447 - 458
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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