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Particle-size distribution, cation exchange capacity and charge density of deferrated montmorillonites

Published online by Cambridge University Press:  09 July 2018

M. S. Stul  and
L. Van Leemput
M. S. Stul
Affiliation:
Centrum voor Oppervlaktescheikunde en Colloïdale Scheikunde, Katholieke Universiteit Leuven, De Croylaan 42, B-3030 Leuven (Heverlee), Belgium
L. Van Leemput
Affiliation:
Centrum voor Oppervlaktescheikunde en Colloïdale Scheikunde, Katholieke Universiteit Leuven, De Croylaan 42, B-3030 Leuven (Heverlee), Belgium
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Abstract

Different montmorillonites (Otay, Chambers, Marnia, Camp Berteau, Moosburg, Greek White, Wyoming bentonite were deferrated with a dithionite/citrate solution; iron sulphide by-products were eliminated with an HCl washing and citrates with an H2O2 oxidation. The smaller CEC after deferration could not be assigned to either (i) the occurrence of a positive correlation between CEC and particle sizes smaller than 0.2 µm or (ii) to the mean charge density of these sub-fractions. All sub-fractions had a heterogeneous interlayer cation density distribution.

Resume

Resume

Différentes montmorillonites (Otay, Chambers, Marnia, Camp Berteau, Moosburg, Greek White, Wyoming bentonite) étaient déferrées par une solution de dithionite, les sulfites de fer étaient éliminés par un lavage d'HCl et les citrates par une oxidation de H2O2. La plus petite CEC après déferrement ne peut pas être assignée (i) en l'occurrence d'une correlation positive entre CEC et dimensions des particules plus petites que 0.2 µm (ii) à la densité de charge moyenne de ces subfractions. Toutes ces subfractions ont une distribution de densité hétérogène des cation interfeuillets.

Kurzreferat

Kurzreferat

Verschiedene Montmorillonite (Otay, Chambers, Marnia, Camp Berteau, Moosburg, Greek White, Wyoming Bentonit) wurden mit einer Dithionit/Citrat-Lösung von Eisenverbindungen gereinigt. Die als Nebenprodukt entstandenen Eisensulfide wurden mit einem HCl-Waschgang und die Citrate durch H2O2-Oxidation entfernt. Die geringere Kationenaustauschkapazität nach der Fe-oxid-Entfernung konnte weder auf (a) die positive Beziehung zwischen Kationenaustauschkapazität und der Teilchengröße <0.2 µm, noch (b) auf die Hauptladungsdichte dieser Unterfraktionen zurückgeführt werden. Alle dieser Unterfraktionen besaßen eine heterogene Zwischenschichtkationen-Dichteverteilung.

Resumen

Resumen

Diferentes montmorillonitas (Otay, Chambers, Marnia, Camp Berteau, Moosburg, Greek White, Wyoming), fueron tratadas para extraer el hierro estructural, con una solución ditionito/citrato, y el sulfuro de hierro que se obtiene como subproducto eliminado con un lavado con ClH y citratos y una oxidación con H2O2. La pequeña capacidad de cambio encontrada después de la extracción del hierro, no deberia ser asignada ni (i) a la existencia de una correlación positiva entre la c.c. y la distribución de tamaño de partícula de la fracción <0.2 µm ni (ii) a la densidad de carga media de esas subfracciones. Todas las subfracciones tienen una distribución heterogénea de densidad de carga interlaminar.

Type
Research Article
Information
Clay Minerals , Volume 17 , Issue 2 , June 1982 , pp. 209 - 216
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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