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Adsorption Studies on Kaolinites — II Adsorption of Amines

Published online by Cambridge University Press:  01 July 2024

Robert F. Conley  and
Mary K. Lloyd
Robert F. Conley
Affiliation:
Georgia Kaolin Research Laboratories, Elizabeth, New Jersey 07207, U.S.A.
Mary K. Lloyd
Affiliation:
Georgia Kaolin Research Laboratories, Elizabeth, New Jersey 07207, U.S.A.
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Abstract

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An investigation of the reaction between amines and hydrogen kaolinites having a broad range of crystallinites and particle sizes has been made. Aqueous and non-aqueous adsorption isotherms, conductivity titrations, rheological measurements and sediment volume studies give strong evidence that edge sites are dominantly involved in the reaction and basal surfaces remain essentially unaltered. The acid-base reaction produces a localized adduct rather than an ionized, protonated amine. The amine-hydrate adduct adsorbs with greatly modified geometry.

Résumé

Résumé

Ce travail porte sur l’étude des réactions entre des amines et les formes hydrogène de kaolinites ayant des cristallinités et des tailles particulates très variées. Les isothermes d’adsorption en milieux aqueux et non aqueux, les titrations conductimétriques, les mesures rhéologiques et les études de volume de sédiment montrent avec évidence que les sites de bord sont concernés d’une façon prédominante dans la réaction et que les surfaces basales restent essentiellement non touchées. La réaction acide-base entraîne l’apparition d’une amine protonée, formée plus par une action locale que par une ionisation. Le complexe amine-hydrate formé s’absorbe avec une géométrie profondément modifiée.

Kurzreferat

Kurzreferat

Es wurde eine Untersuchung der Reaktion zwischen Aminen und Wasserstoff-Kaolini-ten mit einem weiten Bereich von Kristalliniten und Teilchengrössen durchgeführt. Wässrige und nichtwässrige Adsorptionsisothermen. Leitfähigkeitstitrationen, Theologische Messungen und Sedimentsvolumenuntersuchungen deuten stark darauf hin, dass in erster Linie Kantenstellen an der Reaktion beteiligt sind und Grundflächen im allgemeinen unverändert bleiben. Die Säure-Basenreaktion ergibt eher ein örtliches Anlagerungsprodukt als ein ionisiertes, protontragendes Amin. Das Amin-hydrat Anlagerungsprodukt adsorbiert mit weitgehend veränderter Geometrie.

Резюме

Резюме

Проведено изучение реакции между аминами и водородными каолинитами, значительно различающимися по кристалличности и величине частиц. Изучение изотерм водной и неводной адсорбции, титрование проводимости, геологические измерения и определение объема осадка служат важным доказательством преимущественного участия в реакции реберных позиций; базальные поверхности существенно не меняются. Кислотно-основная реакция более легко создает локализованный аддукт, чем ионизированный (протонизированный) амин. Амино-гидратный аддукт адсорбирует с весьма видоизмененной геометрией.

Type
Research Article
Information
Clays and Clay Minerals , Volume 19 , Issue 5 , October 1971 , pp. 273 - 282
Copyright
Copyright © 1971, The Clay Minerals Society

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