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Dimepiperate Adsorption and Hydrolysis on Al3+-, Fe3+-, Ca2+-, and Na+-Montmorillonite

Published online by Cambridge University Press:  28 February 2024

A. Pusino ,
W. Liu  and
C. Gessa
A. Pusino
Affiliation:
Istituto di Chimica Agraria e Forestale, Università di Reggio Calabria, Piazza San Francesco di Sales 4, 89061, Gallina (RC), Italy
W. Liu
Affiliation:
Department of Chemistry, Zhejiang University, Hangzhou 310027, People's Republic of China
C. Gessa
Affiliation:
Istituto di Chimica Agraria, Università di Bologna, Via Berti Pichat 11, 40127 Bologna, Italy
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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.

Keywords

AdsorptionDimepiperateHydrolysisInfrared spectroscopyInterlayer cationsMont-morillonitePesticides
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 3 , June 1993 , pp. 335 - 340
Copyright
Copyright © 1993, The Clay Minerals Society

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