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Open Chemistry

formerly Central European Journal of Chemistry


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Volume 7, Issue 3

Issues

Volume 13 (2015)

Interaction of montmorillonite with phenothiazine dyes and pyronin in aqueous dispersions: A visible spectroscopy study

Adriana Czímerová / Alexander Čeklovský / Juraj Bujdák
Published Online: 2009-06-21 | DOI: https://doi.org/10.2478/s11532-009-0035-x

Abstract

Layer charge is one of the key parameters used for the characterisation of expandable clay minerals, smectites. It determines most significant properties of the material which are important from the industrial application point of view. This work is related to a novel method introduced to characterize the layer charge of smectites, based on using cationic organic dyes as molecular sensors. One xanthene and four phenothiazine cationic dyes were tested using reduced charge montmorillonites (RCMs) and compared with methylene blue, which has been used most frequently. The characterization of the charge was based on the formation of molecular assemblies (H- and J-aggregates) composed by dye cations, which were easily detectable using absorption spectroscopy in the UV/VIS spectrum. More detailed characterization of the spectra required calculations of second-derivative curves. For all of the reaction systems tested in this work, the molecular aggregation increased with the layer charge of RCMs. Slight to moderate differences in the formation of dye assemblies related to the differences in the molecular structures of the individual dye cations. For example, the molecular asymmetry of azure A brought about the formation of coexistent species of similar structures. The structure of the heteroaromatic skeleton affected the extent of the aggregation and spectral changes with time. The presence of reactive, non-substituted amino groups in thionine cations probably partially decomposed in the clay mineral colloids based on high-charge RCMs. Any of the tested dyes could be used as molecular sensors for empirical characterization of the layer charge of clays taking into account the differences mentioned above.

Keywords: Layered silicates; Dye molecules; Molecular aggregates; Adsorption; UV/VIS spectroscopy

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About the article

Published Online: 2009-06-21

Published in Print: 2009-09-01


Citation Information: Open Chemistry, Volume 7, Issue 3, Pages 343–353, ISSN (Online) 2391-5420, DOI: https://doi.org/10.2478/s11532-009-0035-x.

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© 2009 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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