THERMO-IR-SPECTROSCOPY STUDY OF THE MECHANOCHEMICAL ADSORPTION OF 3,5-DICHLOROPHENOL BY TOT SWELLING CLAY-MINERALS

The mechanochemical adsorption of 3,5-dichlorophenol by laponite, sapo nite, montmorillonite, beidellite, and vermiculite was studied. Mixtur es containing dichlorophenol and clay in the ratio 6:10 were manually ground for 1-10 min. The ground mixtures were then analyzed by thermo- IR-spectroscopy. Depending on the surface acidity of the clay two diff erent associations between interlayer cations, water, and dichlorophen ol were identified. In these associations dichlorophenol acts either a s a proton acceptor or donor (configurations I and II, respectively). In laponite, montmorillonite and saponite the surface acidity of inter layer water is high, in beidellite and vermiculite it is low. Conseque ntly, mainly configuration I was obtained for the first group of miner als and configuration II for the second group.