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Adsorption of Safranine by Na+, Ni2+ and Fe3+ Montmorillonites

Published online by Cambridge University Press:  01 July 2024

H. Van Damme ,
M. Crespin ,
M. I. Cruz  and
J. J. Fripiat
H. Van Damme
Affiliation:
Centre de Recherche stir les Solides à Organisation Cristalline Imparfaite, C.N.R.S., 45045 Orleans Cedex, France
M. Crespin
Affiliation:
Centre de Recherche stir les Solides à Organisation Cristalline Imparfaite, C.N.R.S., 45045 Orleans Cedex, France
M. I. Cruz
Affiliation:
Centre de Recherche stir les Solides à Organisation Cristalline Imparfaite, C.N.R.S., 45045 Orleans Cedex, France
J. J. Fripiat
Affiliation:
Centre de Recherche stir les Solides à Organisation Cristalline Imparfaite, C.N.R.S., 45045 Orleans Cedex, France
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Abstract

The adsorption of the cationic oxidized safranine S+ by a Na+, Ni2+ and Fe3+ montmorillonite has been studied with X-ray powder diffraction, u.v., visible and i.r. spectroscopy. In solution S+ may be protonated: S+, SH2+ and SH23+ have characteristic spectra in the 500–600 nm region where the clay structure does not absorb. In the Na+ as well as in the Ni2+ and Fe3+ clays, the adsorption of S+ is a cation exchange process accompanied by the protonation of the adsorbed dye such as variable concentrations of M+ (Na+, Ni2+ or Fe3+), S+ and SH2+ are simultaneously present. Protonation activity decreases from Fe3+ to Ni2+ and Na+, being the protonation site the amine group as shown by i.r. In the interlamellar space it seems that a SH2+.. S+ association exists that could be described as a sandwich structure 6.5 Å thick.

Type
Research Article
Information
Clays and Clay Minerals , Volume 25 , Issue 1 , February 1977 , pp. 19 - 25
Copyright
Copyright © Clay Minerals Society 1977

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