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Effect of Acidity in Montmorillonite Interlayers on the Sorption of Aniline Derivatives

Published online by Cambridge University Press:  01 July 2024

S. Yariv ,
L. Heller  and
N. Kaufherr
S. Yariv
Affiliation:
Department of Geology, The Hebrew University, Jerusalem, Israel
L. Heller
Affiliation:
Department of Geology, The Hebrew University, Jerusalem, Israel
N. Kaufherr
Affiliation:
Department of Inorganic and Analytical Chemistry, The Hebrew University, Jerusalem, Israel
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Abstract

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Sorption of aniline and its derivatives by montmorillonite substituted by cations of widely different acidity depends upon the polarizing power of the interlayer cations. Infra-red spectra indicate that the anilines are mostly bound to the interlayer cations through water molecules, except in Cs montmorillonite, where bonding to the oxygen surfaces of the alumino-silicate sheets seems to predominate. Anilines are weak bases, which compete with the oxygen surfaces for protons of acidic interlayer water. Consequently, the tendency of anilines to act as proton donors in the clay interlayers increases with the polarizing power of the exchangeable cation. The concept of ‘basic’ water is introduced to account for some of the features of the spectra of Cs montmorillonite treated with the organic ligands.

Kurzreferat

Kurzreferat

Die Sorption von Anilin und seinen Derivaten durch Montmorillonit, das mit Kationen sehr verschiedener Azidität substituiert ist, hängt von der Polarisierleistung der Zwischenschicht-Kationen ab. Infrarotspektren deuten darauf hin, daß die Aniline im wesentlichen durch Wassermoleküle mit den Zwischenschicht-Kationen verbunden sind, außer bei Cs Montmorillonit, wo die Bindung an den Sauerstofflächen der Aluminium-Silikatladen vorzuherrschen scheint. Aniline sind schwache Basen, die ebenso wie die Sauerstofflächen Protone saueren Zwischenschichtwassers anziehen. Die Neigung der Aniline als Protonspender in den Tonzwischenschichten zu wirken, nimmt daher mit der Polarisierleistung des austauschbaren Kations zu. Der Begriff “basisches” Wasser wird eingeführt, um einige der Merkmale der Spektren von Cs Montmorillonit, das mit organischen Bindern behandelt wurde, zu erklären.

Резюме

Резюме

Сорбция анилина и его производных монтмориллонитом с обменными катионами весьма различной кислотности зависит от поляризующей силы межслоевых катионов. Инфракрасные спектры показывают, что анилины большею частью связаны с межслоевыми катионами посредством молекул воды; исключение составляет Сs -монтмориллонит, в котором связь с кислородными поверхностями алюмосиликатных листов, по-видимому, преобладает. Анилины представляют слабые основания, которые, как и кислородные пове¬рхности, стремятся присоединить протоны кислотной межслоевой воды. Следовательно, тенденция анилинов действовать в качестве протонных доноров в межслоевых промежутках глинистых минералов возрастает с увеличением поляризующей силы обменного катиона. Предложено понятие об ’основной’ воде для характеристики некоторых особенностей спектров Сз -монтмориллонита, обработанного органическими лигандами.

Type
Research Article
Information
Clays and Clay Minerals , Volume 17 , Issue 5 , October 1969 , pp. 301 - 308
Copyright
Copyright © 1969, The Clay Minerals Society

Footnotes

*

The results obtained for aniline associations in this study are more accurate than those previously reported (Yariv et al., 1968) due to the more powerful grating instrument now available, which permits more accurate assessment of the positions and relative intensities of the peaks.

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