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Water sorption on Ca-saturated clays: II. Internal and external surfaces of montmorillonite

Published online by Cambridge University Press:  09 July 2018

E. C. Ormerod  and
A. C. D. Newman
E. C. Ormerod
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ, UK
A. C. D. Newman
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ, UK
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Abstract

Water-sorption isotherms and interlamellar spacings were measured for Ca montmorillonite (from Redhill. UK) over the relative pressure range 1 > P/P0 > 0. By taking account of the change in interlamellar volume with relative pressure, it is shown that internal and external surfaces can be calculated by a modified t-plot analysis. The results also show that sorption on the external surfaces of the montmorillonite is quantitatively similar to that on reference oxide surfaces. Desorption-sorption hysteresis occurred and was apparently caused by an ageing process in which the interlamellar volume increased at the expense of the external surfaces.

Resume

Resume

On a mesuré les isothermes d'adsorption d'eau et les espacements interlamellaires d'une montmorillonite Ca de Redhill, G.B., pour l'tendue des pressions relatives 1 > P/P0 > 0. En tenant compte du changement de volume interlamellaire fonction de la pression relative, on peut montrer que les surfaces internes et externes peuvent être calculées par une analyse d'une courbe modifiée type t. Les résultats montrent également que l'adsorption sur les surfaces externes de la montmorillonite est quantitativement semblable á celle obtenue sur des surface d'oxydes de référence. On constate une hystérèse désorption-sorption qui est due apparemment à un processus de vieillissement au cours duquel le volume interlamellaire s'accroît, entraînant la diminution des surfaces externes.

Kurzreferat

Kurzreferat

An Ca-Montmorilloniten (Redhili, UK) wurden Wasser-Sorptionsisothermen und Schichtabstände in einem Bereicht des relativen Drucks von 1 > P/P0 > 0 gemessen. Unter Berücksichtigung der Veränderungen im Zwischenschichtvolumen mit dem Partialdruck wird gezeigt, daß die inneren und die äußeren Oberflächen durch eine modifizierte t-plot-Analyse berechnet werden können. Die Ergebnisse zeigen weiterhin, daß die Sorption an den äußeren Oberflächen von Montmorillonit quantitativ ähnlich der an Referenz-Oxidoberflächen ist. Bei den Untersuchungen trat eine Desorptions-Sorptions-Hysteresis auf, die anscheinend durch einen Alterungsprozeß hervorgerufen wurde, in welchem das Zwischenschichtvolumen auf Kosten deräußeren Oberfläche zunahm.

Resumen

Resumen

Se han determinado las isotermas de adsorción de agua y medido los espaciados interlaminares de una montmorillonita-Ca (Redhill, UK), en función de la presión relativa, en el rango 1 > P/P0 > 0. Teniendo en cuenta la variación del volúmen interlaminar con la presión relativa, es posible calcular las superfcies interna y externa mediante un anétlisis de las representaciones t. Los resultados también muestran que la adsorción sobre la superficie externa de la montmorilionita es cuantitativamente similar a la de las superficies de óxidos de referencia. El fenómeno de histéresis detectado parece que es debido a un proceso de envejecimiento en el cual el volúmen interlaminar aumenta a expensas de la superficie externa.

Type
Research Article
Information
Clay Minerals , Volume 18 , Issue 3 , September 1983 , pp. 289 - 299
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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