Thermal analytic study of the adsorption of crystal violet by laponite |
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| Authors: | S Yariv M Müller-Vonmoos G Kahr A Rub |
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| Institution: | (1) Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel;(2) Laboratory for Clay Mineralogy Institute of Foundation Engineering and Soil Mechanics, Federal Institute of Technology, CH-8092 Zü rich, Switzerland |
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| Abstract: | The adsorption of crystal violet on laponite was investigated by X-ray diffraction and thermal analysis. DTA, TG and DTG curves were recorded in air. The evolved H2O, CO2, NO2, H2 and C2H6 were simultaneously determined by mass spectrometry. The thermal analysis curves were compared on one hand with the thermal analysis curves of laponite and on the other hand with thermal analysis curves of non-adsorbed crystal violet and of crystal violet adsorbed on montmorillonite. The thermal analysis curves of crystal violet adsorbed on laponite show similarities to the curves of the non-adsorbed crystal violet, but differ from the curves of crystal violet adsorbed on montmorillonite. The differences in the thermal behaviour were attributed toπ interactions which do not occur between crystal violet and laponite but do occur between this dye and montmorillonite. |
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