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Cation-Exchange Reactions of Siliceous and Aluminous Phillipsites

Published online by Cambridge University Press:  01 July 2024

Yasuhiro Shibue
Yasuhiro Shibue*
Affiliation:
Department of Earth Science and Astronomy, College of General Education University of Tokyo, Komaba, Meguro-ku, Tokyo 153, Japan
*
1Present address: Geological Institute, Faculty of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan.
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Abstract

Exchange isotherms for the pairs Na-K and Na-Ca were measured by use of 0.1 N solutions at 5°, 35°, and 70°C in phillipsite from Tecopa, California (3.63 Al/32 oxygen unit cell), and Oki Islands, Shi-mane Prefecture, Japan (6.31 Al/32 oxygen unit cell). All isotherms except those for Na-Ca at 5°C were reversible. Free energy was evaluated for all reversible exchanges. The thermodynamic affinity sequences were K > Na > Ca in both phillipsites. The selectivity for K in competition with Na and that for Na competing with Ca became larger at the lower temperatures. The siliceous phillipsite preferred the larger cation more strongly for the Na-K system, and Na more strongly for the Na-Ca system than the aluminous phillipsite.

Резюме

Резюме

Изоьермы обмена для пар Na-K и Na-Ca измерялись при использовании 0,1 N растворов при 5°, 35°, и 70°C в филлипситах из Озера Текопа в Калифорнии (3,63 Al/32 O элементарная ячейка) и островов Оки, в префектуре Шимане, Япония (6,31 Al/32 O элементарная ячейка). Все изотермы, за исключении этих для Na-Ca при 5°C, были обратимы. Свободная энергия была определена для всех обратимых обменов. Для обоих Филлипситов порядок термодинамического сродства был: K > Na > Ca. Селективность для К, соревнующегося с Ыа, и селективность для Na, соревнующегося с Са, увеличивалась при более низких температурах. Кремнеземный филлипсит предпочитал большей катион для системы Na-K и Na ион для системы Na-Ca более, чем глиноземный филлипсит. [E.C.]

Resümee

Resümee

Es wurden die Austauschisotherme für die Paare Na-K und Na-Ca für die Phillipsite von Lake Tecopa, Kalifornien (3,63 Al/32 O Elementarzelle) und Oki Islands, Simane Prefecture, Japan, gemessen, wobei 0,1 N Lösungen bei 5°, 35°, und 70°C verwendet wurden. Alle Isotherme mit Ausnahme derer für Na-Ca bei 5°C waren reversibel. Die freie Energie wurde für alle reversiblen Austauschreaktionen berechnet. Die thermodynamische Affinitäts-abfolge war in beiden Phillipsiten K > Na > Ca. Die Selektivität für K gegenüber Na und die für Na gegenüber Ca wurde bei niedrigen Temperaturen größer. Der Silizium-reiche Phillipsit bevorzugt im Fall des Na-K-Systems das größere Kation stärker und im Fall des Na-Ca-Systems das Na stärker als der Al-reiche Phillipsit. [U.W.]

Résumé

Résumé

Les isothermes d’échange pour les paires Na-K et Na-Ca ont été mesurées par l'emploi de 0,1 N solutions à 5°, 35°, et 70°C dans des phillipsites de Lake Tecopa, Californie (maille 3,63 Al/32 O) et des îles Oki, Préfecture Shimane, Japon (maille 6,31 Al/32 O). Tous les isothermes étaient réversibles sauf ceux pour Na-Ca à 5°C. L'energie libre a été évaluée pour tous les échanges réversibles. Les séquences d'affinité thermodynamique étaient K > Na > Ca dans les deux phillipsites. La sélectivité pour K en compétition avec Na et celle pour Na en compétition avec Ca est devenue plus grandes à de basses températures. La phillipsite silice montrait une plus forte préférence que la phillipsite aluminium pour le plus grand cation pour le système Na-K et pour Na pour le système Na-Ca. [D.J.]

Keywords

Cation exchangeCation selectivityChemical compositionPhillipsiteZeolite

Information

Type
Research Article
Information
Clays and Clay Minerals , Volume 29 , Issue 5 , October 1981 , pp. 397 - 402
Copyright
Copyright © 1981, The Clay Minerals Society

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