Simultaneous DTA-TG study of montmorillonite mechanochemically treated with crystal-violet

I. Lapides, S. Yariv, D. Golodnitsky

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The mechanochemical solid-state adsorption of the cationic dye crystal violet (CV) by montmorillonite was investigated by XRD and simultaneous DTA-TG. Solid CV was ground with the clay for 5 min and four different varieties of CV mechanochemically treated clay were investigated. X-ray and DTA data were compared with those of CV-montmorillonite obtained from an aqueous suspension. X-ray and DTA studies of a ground mixture and a ground mixture heated at 110°C suggest that the mechanochemical adsorption of organic cations takes place on the external surfaces of the clay. The study of a ground mixture washed with water, and washed with water and acetone reveal that water is essential for the penetration of CV into the interlayer space.

Original languageEnglish
Pages (from-to)99-112
Number of pages14
JournalJournal of Thermal Analysis and Calorimetry
Issue number1
StatePublished - 2002


  • Crystal violet
  • DTA
  • Mechanochemical adsorption
  • Montmorillonite
  • Organo-smectites


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