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Properties of Hexacyanocobaltate(III)-Exchanged Hydrotalcite-Like Minerals

Published online by Cambridge University Press:  02 April 2024

Eiichi Suzuki ,
Satoshi Idemura  and
Yoshio Ono
Eiichi Suzuki
Affiliation:
Department of Chemical Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Satoshi Idemura
Affiliation:
Department of Chemical Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Yoshio Ono
Affiliation:
Department of Chemical Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
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Abstract

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Hydrotalcite-like minerals, containing Mg2+-Al3+-Xn− (Xn− = NO3−, Cl−, SO42−, or CrO42−), Zn2+-Al3+-NO3−, or Zn2+-Cr3+-NO3− ions, were intercalated with Co(CN)63− by an anion exchange method. For most of the minerals examined, the degree of anion exchange was 79–90%. X-ray powder diffraction patterns of the ion-exchanged samples revealed two peaks at about 8° and 11°2θ (CuKα radiation) attributable to reflections from expanded and non-expanded interlayers, respectively. The intensity of the peak at about 8°2θ was a linear function of the degree of anion exchange. The amount of hexane adsorbed onto the anion-exchanged sample increased linearly with the increase in degree of anion exchange. From these results, anions near the edge of the interlayers appear to have been preferentially replaced by Co(CN)63− at a low degree of anion exchange, whereas those at some distance from the edge were replaced only at a high degree of anion exchange. The adsorption capacity of the Co(CN)63−-exchanged sample for hydrocarbons was: hexane ≃ 2-methylpentane ≫ cyclohexane > methylcyclohexane. The adsorption of chain hydrocarbons and cyclic hydrocarbons was different.

Keywords

AdsorptionAnion exchangeHexacyanocobaltateHydrocarbonsHydrotalciteIntercalation
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 2 , April 1989 , pp. 173 - 178
Copyright
Copyright © 1989, The Clay Minerals Society

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