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Interaction of Chlordimeform with Clay Minerals

Published online by Cambridge University Press:  01 July 2024

Maria C. Hermosin  and
J. L. Perez Rodriguez
Maria C. Hermosin
Affiliation:
Centro de Edafologia y Biologia Aplicada del Cuarto del C.S.I.C., Apartado 1052, Sevilla, Spain
J. L. Perez Rodriguez
Affiliation:
Centro de Edafologia y Biologia Aplicada del Cuarto del C.S.I.C., Apartado 1052, Sevilla, Spain
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Abstract

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The adsorption-desorption of the cationic pesticide chlordimeform from aqueous solutions on montmorillonite, kaolinite, illite, and vermiculite appears to be a cation-exchange process coupled with the coadsorption of neutral molecules and the extraction of Al from the structure of the mineral. Chlordimeform adsorption on montmorillonite, illite, and vermiculite by cation exchange is an irreversible process, whereas chlordimeform adsorbed on kaolinite is weakly bonded to the clay and easily removed by washing with water. X-ray powder diffraction and infrared spectroscopic data show that chlordimeform cations are adsorbed in the interlamellar spaces of montmorillonite at charge sites, lying in a flat position in contrast to kaolinite, illite, and vermiculite, where they adsorb on external surfaces or charge sites close to the crystal edges.

Резюме

Резюме

Адсорбция-десорбция катионного пестицида, хлордимеформа, из водяного раствора на монтмориллоните, каолините, иллите, и вермикулите является катионнообменным процессом, связанным с коадсорбцией нейтральных молекул и экстракцией Аl из структуры минерала. Адсорбция хлордимеформа на монтмориллоните, иллите, и вермикулите при помощи катионного обмена является необратимым процессом, тогда как хлордимеформ, адсорбированный на каолините, есть слабо связанный с глиной и легко удаляемый при промывании водой. Результаты рентгеновской порошковой дифракции и инфракрасной спектроскопии показывают, что катионы хлордимеформа адсорбируются в пространствах между тонкими пластинками монтмориллонита, в центрах заряда, расположенные плоско, в противоположности до каолинита, иллита, и вермикулита, в которых они адсорбируются на внешней поверхности центров заряда, в поблизости ребор кристалла. [Е.С.]

Resümee

Resümee

Die Adsorption-Desorption des kationischen Pestizides Chlordimeform aus wässrigen Lösungen an Montmorillonit, Kaolinit, Illit, und Vermiculit scheint ein Kationenaustauschprozeß zu sein, der gleichzeitig mit der Adsorption neutraler Moleküle und der Extraktion von Al aus der Mineralstruktur gekoppelt ist. Die Adsorption von Chlordimeform an Montmorillonit, Illit, und Vermiculit durch Kationenaustausch ist ein irreversibler Prozeß, während an Kaolinit adsorbiertes Chlordimeform nut schwach an den Ton gebunden ist und leicht mit Wasser ausgewaschen werden kann. Die Daten der Röntgenpulverdiffraktometrie und Infrarotspektroskopie zeigen, daß Chlordimeform-Kationen in den interlamellaren Zwischenräumen des Montmorillonites an Ladungsplätzen adsorbiert sind und in einer flachen Position liegen, während sie bei Kaolinit, Illit, und Vermiculit im Gegensatz dazu an äußeren Oberflächen oder an Ladungsplätzen nahe der Kristallkanten adsorbiert zu sein scheinen. [U.W.]

Résumé

Résumé

L'adsorption-ésorption du pesticide cationique chlordiméforme de solutions aqueuses sur la montmorillonite, la kaolinite, l'illite, et la vermiculite semble être un procédé d’échange de cations accouplé à la coadsorption de molécules neutres et à l'extraction d’ Al de la structure du minéral. L'adsorption de la chlordiméforme sur la montmorillonite, l'illite, et la vermiculite par échange de cations est un procédé irréversible, tandis que la chlordiméforme adsorbée sur la kaolinite est faiblement liée à l'argile, el facilement enlevée par un lavage à l'eau. Les données de diffraction poudrée aux rayons-X, et de spectroscopie infrarouge montrent que les cations de chlordiméforme sont adsorbés dans les espaces interfeuillets de la montmorillonite à des sites de charges, dans une position plate, contrairement à la kaolinite, l'illite, et la vermiculite, où ils semblent adsorber sur les surfaces externes ou sur des sites de charges près des bords des cristaux. [D.J.]

Keywords

AdsorptionChlordimeformIlliteKaoliniteMontmorillonitePesticideVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 29 , Issue 2 , April 1981 , pp. 143 - 152
Copyright
Copyright © 1981, The Clay Minerals Society

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