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Hydroxy-Chromium Smectite

Published online by Cambridge University Press:  28 February 2024

C. Volzone ,
A. M. Cesio ,
R. M. Torres Sánchez  and
E. Pereira
C. Volzone
Affiliation:
Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Cno. Centenario y 506, CC49 (1897), M. B. Gonnet, Argentina
A. M. Cesio
Affiliation:
Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Cno. Centenario y 506, CC49 (1897), M. B. Gonnet, Argentina
R. M. Torres Sánchez
Affiliation:
Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Cno. Centenario y 506, CC49 (1897), M. B. Gonnet, Argentina
E. Pereira
Affiliation:
Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Cno. Centenario y 506, CC49 (1897), M. B. Gonnet, Argentina
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Abstract

Hydroxy-chromium solutions were prepared from chromium nitrate solutions by adding NaOH with OH/Cr = 2.

The solutions were treated at 20°C and 60°C. The hydrolysis times were from 1 to 100 days. Polymeric species in hydrolyzed chromium solutions were followed by visible absorption spectra within the range 325–800 nm and by pH measurement. OH-Cr-smectite with high d(001) spacing (2.07 nm) was obtained when hydroxy-chromium solution was prepared at 60°C and with 1-day hydrolysis. When this sample was heated up to 350°C the basal spacing collapsed at 1.8 nm.

The samples were characterized by X-ray diffraction and N2 adsorption-desorption isotherms.

Keywords

Cross-linked smectitesPillared smectitesPolymeric Cr species
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 6 , December 1993 , pp. 702 - 706
Copyright
Copyright © 1993, The Clay Minerals Society

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