Abstract
The adsorption of the herbicide dimepiperate S-(α;α-dimethylbenzyl)-1-piperidinecarbothioate on homoionic Fe3+-, Al3+-, Ca2+-, and Na+-montmorillonite was studied in aqueous medium. The adsorption is described well by the Freundlich equation. The adsorption capacity decreases in the order Fe3+ > Al3+ > Ca2+ > Na+ clay. The dimepiperate adsorption from chloroform solution was also investigated by analytical, spectroscopic, and X-ray powder diffraction techniques. IR results suggest that the adsorption involves the interaction of the thioester carbonyl group of dimepiperate possibly with the surrounding water of metal ions. On Al3+ and Fe3+ clays, this interaction leads to hydrolysis of the thioester bond and formation of the thiol and carbamic acid derivatives that yield α-methylstyrene and piperidine, respectively.
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Pusino, A., Liu, W. & Gessa, C. Dimepiperate Adsorption and Hydrolysis on Al3+-, Fe3+-, Ca2+-, and Na+-Montmorillonite. Clays Clay Miner. 41, 335–340 (1993). https://doi.org/10.1346/CCMN.1993.0410308
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DOI: https://doi.org/10.1346/CCMN.1993.0410308