Abstract
The mechanochemical adsorption of phenol by laponite, saponite, montmorillonite, beidellite and vermiculite was studied by simultaneous DTA and TG analysis. Fitting of the DTA curves showed four endothermic peaks in the r.t. -250°C temperature range. The first peak represents the melting of the excess crystalline phenol. The second peak represents the evolution of water. The third peak represents the boiling of the free phenol. The fourth peak represents the evolution of adsorbed phenol. In the DTA curves of montmorillonite the fourth peak is not observed as a separate peak but as part of the third peak. Laponite, saponite and montmorillonite show a very small exothermic effect which follows the endothermic events. Iaponite adsorbs the greatest amounts of phenol and shows a strong exothermic peak at 390°C. None of the other clays show this exothermic effect at this temperature.
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