The adsorption of the herbicide imazamethabenz-methyl from water onto Al3+-, Fe3+-, Ca2+-, K+, and Na+-montmorillonite was studied by analytical (HPLC) methods. The adsorption from an organic solvent was also investigated by spectroscopic (IR) and X-ray diffraction measurements. It was observed that, depending on the acidic properties of the exchangeable cations, two different mechanisms may take place. The first one, acting on Fe3+- and Al3+- clays, involves the protonation of the more basic nitrogen atom of imidazolinone ring of the herbicide because of a proton transfer from the acidic metal-bound water, followed by adsorption on the clay surfaces. The second mechanism, taking place on Ca2+-, K+- and Na+-clays, is hydrogen-bond formation between the ester carbonyl group of the herbicide and hydration water metal ions and is not affected by the structure of the isomers.

Adsorption mechanisms of imazamethabenz-methyl on homoionic montmorillonite / Pusino, A; Gelsomino, Antonio; Gessa, C. - In: CLAYS AND CLAY MINERALS. - ISSN 0009-8604. - 43:3(1995), pp. 346-352. [10.1346/CCMN.1995.0430309]

Adsorption mechanisms of imazamethabenz-methyl on homoionic montmorillonite

GELSOMINO, Antonio;
1995-01-01

Abstract

The adsorption of the herbicide imazamethabenz-methyl from water onto Al3+-, Fe3+-, Ca2+-, K+, and Na+-montmorillonite was studied by analytical (HPLC) methods. The adsorption from an organic solvent was also investigated by spectroscopic (IR) and X-ray diffraction measurements. It was observed that, depending on the acidic properties of the exchangeable cations, two different mechanisms may take place. The first one, acting on Fe3+- and Al3+- clays, involves the protonation of the more basic nitrogen atom of imidazolinone ring of the herbicide because of a proton transfer from the acidic metal-bound water, followed by adsorption on the clay surfaces. The second mechanism, taking place on Ca2+-, K+- and Na+-clays, is hydrogen-bond formation between the ester carbonyl group of the herbicide and hydration water metal ions and is not affected by the structure of the isomers.
1995
adsorption; herbicide; montmorillonite; organic solvent
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12318/2272
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