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Effect of 1,4-Dioxane on the Expansion of Montmorillonite Layers in Montmorillonite/Water Systems

Published online by Cambridge University Press:  28 February 2024

Jun Wu ,
P. F. Low  and
C. B. Roth
Jun Wu
Affiliation:
Agronomy Department, Purdue University, West Lafayette, Indiana 47907
P. F. Low
Affiliation:
Agronomy Department, Purdue University, West Lafayette, Indiana 47907
C. B. Roth
Affiliation:
Agronomy Department, Purdue University, West Lafayette, Indiana 47907
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Abstract

Suspensions were produced by mixing Na-saturated, Upton montmorillonite with aqueous solutions containing different concentrations of 1,4-dioxane. Each suspension was deposited on a porous ceramic filter in an environmental chamber, and the solution was expressed from it by admitting gaseous helium to the chamber at a slightly elevated pressure. The chamber was fitted 1) with beryllium windows so that X-rays could be transmitted into and out of it and 2) with a drain so that the expressed solution could be conducted to the outside atmosphere. Once a filter cake had formed on the filter, the pressure of the gaseous helium was raised in successive increments and, after each increment, the c-axis layer spacing(s) was determined by X-ray diffraction. Increasing the concentration of 1,4-dioxane caused some of the fully expanded layers to collapse to the partially expanded state (c-axis spacing = 15 Å) and appeared to cause the remaining fully expanded layers to move farther apart, especially at the higher pressures. Alternative explanations were given for these apparently contradictory results.

Keywords

1,4-dioxaneLayer expansionMontmorilloniteSwelling
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 2 , April 1994 , pp. 109 - 113
Copyright
Copyright © 1994, Clay Minerals Society

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Footnotes

1

Journal Paper 13596, Purdue University Agricultural Research Program, West Lafayette, Indiana 47907-1150.

2

Visiting Associate Professor from the Institute of Soil Science, Academia Sinica, Nanjing, People's Republic of China.

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