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Adsorbed Cr(III) on Chlorite, Illite, and Kaolinite: An X-Ray Photoelectron Spectroscopic Study

Published online by Cambridge University Press:  01 July 2024

M. H. Koppelman ,
A. B. Emerson  and
J. G. Dillard
M. H. Koppelman*
Affiliation:
Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
A. B. Emerson*
Affiliation:
Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
J. G. Dillard
Affiliation:
Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
*
1Present address: Georgia Kaolin Research Laboratories, 25 Route 22, East, Springfield, New Jersey 07081.
1Present address: Georgia Kaolin Research Laboratories, 25 Route 22, East, Springfield, New Jersey 07081.
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Abstract

The adsorption of Cr(III) was studied at pH 1, 2, 3, 4, 6, 8, and 10 on chlorite and kaolinite and at pH 1, 2, 3, and 6 on illite. The amount of chromium adsorbed on chlorite varied from 3.1 × 10–5 mole/ g at pH 1 to 16.6 × 10–5 mole/g at pH 4, and on illite from 4.9 × 10–5 mole/g to 9.2 × 10–5 mole/g at pH 1 and 3, respectively. Kaolinite adsorbed 3.7 × 10–5 mole Cr/g at pH 1, 2, and 3 and 5.5 × 10–5 mole Cr/g at pH 4. Measurements of the Cr 2p core-level binding energies indicate that chromium is probably adsorbed as a Cr(III) aqua ion at pH values below 4. The binding energies for the Cr 2p level for samples prepared above pH 4 compare favorably with the value determined for chromium hydroxide and lead to the conclusion that the chromium species present at pH 6, 8, and 10 is chromium hydroxide.

Резюме

Резюме

Изучалась адсорбция Сг(III) хлоритом и каолинитом при рН 1, 2, 3, 4, 6, 8, и 10 и иллитом при рН 1, 2, 3, и 6. Количество хрома, адсорбированного хлоритом, изменяется от 3.1 × 10} моль/г при рН 1 до 16,6× 10} моль/г при рН 4, и иллитом от 4,9× 10} моль/г ло× 10} моль/г при рН 1 и 3 соответственно. Каолинит адсорбировал 3,7× 10−5 моль Сг/г при рН 1, 2, и 3 и 5,5× 10−5 моль Сг/г при рН 4. Измерения связывающих энергий Сг на ядерном уровне 2р показывают, что хром, вероятно адсорбируется как водный ион Сг(III) при величинах рН меныше 4. Связывающие энергии для Сг на уровне 2р для образцов, приготовленных при рН выше 4, сильнее по сравнению с величиной, найденной для гидроокиси хрома, из чего следует, что соединение хрома, присутствующее при рН 6, 8, и 10 является гидроокисью. [N. R.]

Resümee

Resümee

Die Adsorption von Cr(III) an Chlorit und Kaolinit wurde bei den pH-Werten 1, 2, 3, 4, 6, 8, und 10 untersucht, die an Illit bei pH 1, 2, 3, und 6. Die Chrommenge, die an Chlorit adsorbiert wurde, variierte von 3,1 × 10–5 Mol/g bei pH 1 bis 16,6 × 10–5 Mol/g bei pH 4. Die an Illit adsorbierte Menge variierte von 4,9 × 10–5 Mol/g bis 9,2 × 10–5 Mol/g bei pH 1 bzw. 3. Kaolinit adsorbierte 3,7 × 10–5 Mol Cr/g bei pH 1,2, und 3 und 5,5 × 10–5 Mol Cr/g bei pH 4. Messungen der Cr 2p Kernlevel-Bindungsenergien deuten darauf hin, daß das Chrom bei pH-Werten unter 4 wahrscheinlich als ein Cr(III)aqua-ion adsorbiert ist. Die Bindungsenergien für den Cr 2p-Level bei Proben, die oberhalb pH 4 präpariert wurden, stimmen sehr gut mit dem Wert überein, der für Chromhydroxid bestimmt wurde, und führen zu dem Schluß, daß das Chrom bei den pH-Werten 6, 8, und 10 in Form von Chromhydroxid vorliegt. [U.W.]

Résumé

Résumé

L'adsorption de Cr(III) sur la chlorite et la kaolinite a été étudiée aux pH 1, 2, 3, 4, 6, 8, et 10, et sur l'illite aux pH 1, 2, 3, et 6. La quantité de chromium adsorbée sur la chlorite a varié de 3,1 × 10–5 mole/g à un pH 1 à 16,6 × 10–5 mole/g à pH 4, et sur l'illite, de 4,9 × 10–5 mole/g à 9,2 × 10–5 mole/g aux pH 1 et 3, respectivement. La kaolinite a adsorbé 3,7 × 10–5 mole Cr/g aux pH 1, 2, et 3, et 5,5 × 10–5 mole Cr/g à pH 4. Des mesures des énergies de liens du niveau de noyeu 2p de Cr indiquent que le chromium est probablement adsorbé en tant qu'ion aqua Cr(III) à des pH plus bas que 4. Les énergies de liens pour le Cr de niveau 2p pour des échantillons préparés à un pH plus haut que 4 peuvent être favorablement comparées à la valeur déterminée pour l'hydroxide de chromium, et mènent à conclure que l'espèce de chromium présente aux pH 6, 8, et 10 est l'hydroxide de chromium. [D.J.]

Keywords

AdsorptionBinding energyChloriteChromiumIiliteKaoliniteXPS
Type
Research Article
Information
Clays and Clay Minerals , Volume 28 , Issue 2 , April 1980 , pp. 119 - 124
Copyright
Copyright © Clay Minerals Society 1980

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