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Extended Version of Gouy-Chapman Electrostatic Theory as Applied to the Exchange Behavior of Clay in Natural Waters

Published online by Cambridge University Press:  02 April 2024

C. Neal  and
D. M. Cooper
C. Neal
Affiliation:
Institute of Hydrology, Maclean Building, Crowmarsh Gifford, Wallingford, Oxon OX10 8BB, United Kingdom
D. M. Cooper
Affiliation:
Institute of Hydrology, Maclean Building, Crowmarsh Gifford, Wallingford, Oxon OX10 8BB, United Kingdom
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Abstract

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A model based on Gouy-Chapman theory, describing the ion exchange behavior of clays in mixed electrolyte solutions is presented. Computed ionic distributions, taking into account variations in relative permittivity, ion activity, and closeness of approach of ions to clay surfaces, are compared with experimental data for smectite and kaolinite in contact with river and saline waters. To obtain reasonable agreement between theoretical prediction and observation the most important extension of Gouy-Chapman theory involves the introduction of a closeness of approach term. Furthermore, the aggregated nature of smectites plays an important part in controlling its exchange properties, whereas a fixed-charge model provides a poor description for the ion exchange properties of kaolinite.

Резюме

Резюме

На основе теории Гуя-Чапмана представлена модель, описывающая ионообменное поведение глин в растворах смешанных электролитов. Принимая во внимание изменения диэлектрической проницаемости, активности ионов и близость доступа ионов к глинистым поверхностям, были рассчитаны ионовые распределения, которые сравнивались с экспериментальными данными для смектита и каолинита, находившимися в контакте с речной и соленой водой. Наиболее значительное расширение теории Гуя-Чапмана включает в себя введение члена "близость доступа," чтобы получить достаточное согласие между теоретическими предсказаниями и наблюдениями. Кроме того, сложная натура смектитов играет значительную роль в контролировании свойств обмена, тогда как модель постоянного заряда неполностью описывает свойства обмена ионов для каолинита. [E.G.]

Resümee

Resümee

Es wird ein Modell vorgestellt, das auf der Gouy-Chapman Theorie beruht, mit dem das Ionenaustauschverhalten von Tonen in gemischten Elektrolytlösungen beschrieben wird. Mittels Computerberechnete Ionenverteilungen, die Variationen der relativen Durlässigkeit, der Ionenaktivität und der Annäherung der Ionen an die Tonoberflächen berücksichtigen, wurden mit experimentellen Daten für Smektit und Kaolinit, die in Kontakt mit Flußwässern und salinen Wässern waren, verglichen. Um eine brauchbare Übereinstimmung zwischen der theoretischen Vorhersage und den Beobachtungen zu erzielen, war die Einführung eines Annäherungsterms die wichtigste Erweiterung der Gouy-Chapman Theorie. Darüberhinaus spielt das Aggregat-förmige Auftreten der Smektite eine wichtige Rolle, indem es die Austauscheigenschaften beeinflußt, während ein Modell mit definierter Ladung nur eine ungenügende Beschreibung für die Ionenaustauscheigenschaften des Kaolinits liefert. [U.W.]

Résumé

Résumé

On présente un modèle, basé sur la théorie Gouy-Chapman, décrivant le comportement d’échange d'ions d'argiles dans des solutions d’électrolytes mélangés. Des distributions ioniques computées, qui tiennent compte des variations de permittivité relative, d'activité ionique et de la proximité d'approche des ions des surfaces argileuses, sont comparées avec des données expérimentales pour la smectite et la kaolinite en contact avec des eaux fraîches et salées. Pour obtenir un accord raisonnable entre la prédiction théorique et l'observation, l'extension la plus importante de la théorie de Gouy-Chapman implique le terme de proximité d'approche. De plus, la nature aggregate des smectites joue un role important dans le contrôle de ses propriétés d’échange, tandis qu'un modèle à charge fixe fourni une description pauvre pour les propriétés d’échange d'ions de la kaolinite. [D.J.]

Keywords

ElectrolyteGouy-Chapman theoryIon exchangeKaoliniteSmectiteWater
Type
Research Article
Information
Clays and Clay Minerals , Volume 31 , Issue 5 , October 1983 , pp. 367 - 376
Copyright
Copyright © 1983, The Clay Minerals Society

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