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The aggregation of methylene blue in montmorillonite dispersions

Published online by Cambridge University Press:  09 July 2018

J. Bujdák*
Affiliation:
National Institute for Materials Science, Namiki 1-1, Tsukuba Ibaraki 305-0044, Japan
N. Iyi
Affiliation:
National Institute for Materials Science, Namiki 1-1, Tsukuba Ibaraki 305-0044, Japan
T. Fujita
Affiliation:
National Institute for Materials Science, Namiki 1-1, Tsukuba Ibaraki 305-0044, Japan
*

Abstract

Theories concerning the optical properties of cationic dyes adsorbed on clay surfaces are analysed in detail. An investigation of the aggregation of methylene blue (MB) in montmorillonite dispersions is conducted using visible (VIS) spectroscopy. The effects of the dye/ clay ratio and of the swelling properties of the montmorillonite substrate on dye aggregation are compared in terms of the effect of clay layer charge. The observed influence on dye aggregation was almost negligible for both swelling and dye loading. The layer charge of the silicate determines the extent and the type of dye aggregation in freshly prepared MB/montmorillonite dispersions. Observed spectral changes with time indicate a rearrangement and redistribution of dye H-aggregates (band close to 570 nm) to monomers (660 nm), dimers (605 nm) and J-aggregates (760 nm). Dye aggregates are probably already formed during dye cation migration in the vicinity of clay colloid particles. The extent and the type of initially formed species are probably affected by the electric double layer of clay layers. After reaching the clay surface, dye cation assemblies are rearranged and decompose as described above. Reaching chemical equilibrium, dye cations adjust the distribution of the layer charge, in order that each cation could balance the charge due to one unequivalent substitution.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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