The mechanochemical adsorption of 3,5-dichlorophenol by laponite, saponite, montmorillonite, beidellite, and vermiculite was studied. Mixtures 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 different associations between interlayer cations, water, and dichlorophenol were identified. In these associations dichlorophenol acts either as a proton acceptor or donor (configurations I and II, respectively). In laponite, montmorillonite and saponite the surface acidity of interlayer water is high; in beidellite and vermiculite it is low. Consequently, mainly configuration I was obtained for the first group of minerals and configuration II for the second group.
Bibliographical noteFunding Information:
The authors wish to thank Prof. I. Lin from The Technion, Haifa, Israel, for the vermiculite samples and Laporte Industries, Inc., UK for the laponite sample. This research was supported under Project No. C12-219, Grant No. HRN 5544 G002069, US-Israel Cooperative Development Research Program, Office of the Science Advisor, US Agency for International Development.
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- Clay acidity
- Clay minerals
- Mechanochemical adsorption