Clays and Clay Minerals, Vol. 57, No. 3, 361–370, 2009.
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Authors
Sucha, V.
Czimerova, A.
Bujdak, J.
Issue Date
2009
Type
Article
Language
Keywords
Periodicals , Geology , Clay Surface Properties , Illite-smectite , Layer Charge , Rhodamine 6G , Smectite , UVvis Spectroscopy
Alternative Title
Surface Properties Of Illite-smectite Minerals As Detected By Interactions With Rhodamine 6g Dye
Abstract
Interactions between smectite clay minerals and various organic dyes have been studied extensively, but little information has accumulated from dye interactions with mixed-layer illite-smectite (I-S) minerals, especially regarding relationships with clay layer expandability, layer charge, particle size/ shape, and molecular aggregation of organic dye molecules. The purpose of this study was to investigate the surface interactions of a set of mixed-layer illite-smectites from different geological environments with Rhodamine 6G dye. The samples used have different amounts of expandable smectite interlayers, different particle size and/or shape, and different layer-charge density at the surface. Five smectites with differences in layer charge and some non-expandable layer silicates were also tested. The interactions detected by UVvis spectroscopy show no reaction between R6G and non-expandable minerals (kaolinite, mica), and intense reactions forming H-aggregates and monomers with smectites and illite-smectites. The intensity of H-aggregate formation increases with increase in the layer charge of smectites. Mixed-layer illitesmectites interact with R6G more intensely than do smectites. H-aggregate and monomer formation increases with the illitization process for randomly ordered illite-smectites (R = 0) and decreases in the course of illitization for the ordered illite-smectites (R > 0).
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Citation
Clays and Clay Minerals, Vol. 57, No. 3, 361–370, 2009.
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