The adsorption of methylene blue on montmorillonite from acid solutions
| Autor: | Christiana Kliková, Zdeněk Klika, Tomáš Matys Grygar, Michaela Dudová, Pavla Čapková, Petra Pustková |
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| Rok vydání: | 2011 |
| Předmět: |
Aqueous solution
Ion exchange Intercalation (chemistry) Inorganic chemistry Analytical chemistry 020101 civil engineering 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences 0201 civil engineering chemistry.chemical_compound Adsorption Montmorillonite chemistry Geochemistry and Petrology Fourier transform infrared spectroscopy Methylene blue Powder diffraction 0105 earth and related environmental sciences |
| Zdroj: | Clay Minerals. 46:461-471 |
| ISSN: | 1471-8030 0009-8558 |
| DOI: | 10.1180/claymin.2011.046.3.461 |
| Popis: | The adsorption of methylene blue (MB) on montmorillonite from acid solutions has not yet been studied in detail. In this paper the adsorption of this dye on Ca/SAz montmorillonite from 0.32, 0.80 and 1.60 M HCl solutions at ambient temperature and after 2 hours leaching was carefully studied and evaluated. Under the above conditions the MB/SAz intercalates formed are practically insoluble. In contrast to the adsorption of methylene blue on montmorillonite from aqueous solutions, the adsorption from acid solutions consists of two adsorption waves. The intercalated samples from the first and second waves were studied using X-ray powder diffraction (XRD), FTIR, Vis spectroscopy, and scanning electron microscopy (SEM) equipped with a microprobe system. The adsorption of MB in the first wave is attributed to ion exchange of the dye cationic species (MB+, MB22+, H-aggregates, MBH2+ and H+) for the original interlayer cations of montmorillonite. The percentages of MBH2+ and H+ based on total adsorbed MB were estimated for varying HCl concentrations. The second adsorption wave is linked to the precipitation of MB species on the outer MB/SAz surface. |
| Databáze: | OpenAIRE |
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