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The Effect of Cation Exchange of Tris(Ethylenediamine)Cobalt (III) for Sodium on Nitrogen Sorption by Montmorillonite

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Clays and Clay Minerals

Abstract

The cation exchange process between tris(ethylenediamine)cobalt(III) and Na+ on mont-morillonite was studied by atomic absorption spectrophotometry, X-ray diffraction, differential thermal analysis, and nitrogen sorption at 78°K. The exchange of Co(en)33+ for Na+ was found to be extremely favorable, with a tendency toward segregation of the two kinds of cations in the mixed clays studied. Small amounts of Co(en)3+3 were found to lower the nitrogen sorption capacity of Na+ mont-morillonite while clays with high Co(en)3+3 content had greatly enhanced sorption. An explanation is offered in terms of a dual role of the Co(en)3+3 in determining the kind and amount of nitrogen sorption in the exchanged montmorillonite.

Résumé

Le phénomène d’échange cationique entre le tris (éthylène-diamine) cobalt (III) et le sodium sur la montmorillonite a été étudié par spectrophotométrie d’absorption atomique, diffraction X, analyse thermique différentielle et sorption d’azote à 78°K.

L’échange de Na+ par Co (en)33+ s’est révélé très favorable, avec une tendance vers la ségrégation des deux sortes de cations dans les argiles mixtes étudiées. On a trouvé que de petites quantités de Co (en)33+ abaissent la capacité de sorption pour l’azote de la montmorillonite Na+, tandis que les argiles riches en Co (en)33+ ont une sorption fortement augmentée. On fournit une explication de ce fait sur la base du double rôle que joue le Co (en)33+ dans la détermination de la nature et de l’intensité de la sorption de l’azote dans la montmorillonite ayant subi l’échange d’ion.

Kurzreferat

Der Kationenaustausch zwischen Tri(äthylendiamin)kobalt(III) und Na+ bei Mont-morillonit wurde durch atomische Absorptionsspektrophotometrie, Röntgenbeugung, differentielle Wärmeanalyse und Stickstoffsorption bei 78°K untersucht. Der Austausch von Co(en)3+3 für Na erwies sich als außerordentlich günstig, und es besteht eine Tendenz zur Absonderung der beiden Kationenarten in den untersuchten gemischten Tonsorten. Kleine Mengen Co(en)3+3 senken, wie erwiesen wurde, die Stickstoffsorptionsfähigkeit von Na+ Montmorillonit, während Tonarten mit hohem Co(en)3+3 Gehalt eine stark erhöhte Sorption aufwiesen. Dies wurde dadurch erklärt, daß Co(en)3+3 bei der Bestimmung der Art und des Ausmaßes der Stickstoffsorption in dem ausgetauschten Montmorillonit eine doppelte Rolle spielt.

Резюме

Изучался процесс обмена катионов трис-(этилендиамин) кобальта (III) и Na+ монтмориллонита посредством ядерной абсорбционной спектроскопии, рентгеновской дифракции, дифференциального термического анализа и сорбции азота при 78°К. Нашли, что обмен Со(еп)3+3 для Na+ был очень благоприятный, но с тенденцией сегрегации двух видов катионов в изучаемых смешанных глинах. Заметили, что небольшое количество Со(еп)3+3 понижает способность сорбции азота монтмориллонитом Na+, в то время как высокое содержание Со(еп)3+3 в глинах очень повышает их сорбцию. Объясняется это двойной ролью Со(еп)3+3 в установлении какое количество азота абсорбируется обменным монтмориллонитом.

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Authors and Affiliations

  1. Baroid Division, NL Industries, Inc., P.O., Box 1675, Houston, Texas, 77001, USA

    M. I. Knudson Jr.

  2. Department of Chemistry, Baylor University, Waco, Texas, 76703, USA

    J. L. McAtee Jr.

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  1. M. I. Knudson Jr.
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  2. J. L. McAtee Jr.
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Knudson, M.I., McAtee, J.L. The Effect of Cation Exchange of Tris(Ethylenediamine)Cobalt (III) for Sodium on Nitrogen Sorption by Montmorillonite. Clays Clay Miner. 21, 19–26 (1973). https://doi.org/10.1346/CCMN.1973.0210105

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  • DOI: https://doi.org/10.1346/CCMN.1973.0210105

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