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SURFACE PROPERTIES OF ILLITE-SMECTITE MINERALS AS DETECTED BY INTERACTIONS WITH RHODAMINE 6G DYE

V. ucha¹, A. Czímerová^2,* and J. Bujdák²

¹ Department of Geology of Mineral Deposits, Comenius University, Mlynská dolina G, 842 15 Bratislava, Slovak Republic
² Institute of Inorganic Chemistry, Slovak Academy of Science, SK-845 36, Bratislava, Slovak Republic

^* E-mail address of corresponding author: adriana.czimerova{at}savba.sk

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 UV-vis 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 illite-smectites 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).

Key Words: Clay Surface Properties • Illite-smectite • Layer Charge • Rhodamine 6G • Smectite • UV-vis Spectroscopy