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Retention of OH-Al complexes by dioctahedral smectites

Published online by Cambridge University Press:  09 July 2018

C. Volzone  and
L. B. Garrido
C. Volzone*
Affiliation:
Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), C.C. 49, Cno. Centenario y 506, (1897) M. B. Gonnet, Prov., Buenos AiresArgentina
L. B. Garrido
Affiliation:
Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), C.C. 49, Cno. Centenario y 506, (1897) M. B. Gonnet, Prov., Buenos AiresArgentina
*
*E-mail: [email protected]
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Abstract

Dioctahedral smectites (Cheto- and Wyoming-type montmorillonites and a beidellite) were treated with two hydrolysed OH-Al solutions (0.02 M in Al) containing different OH-Al complexes. The ratio of ∼3.25 mmol of Al per gram of smectite was used. The total Al and the presence of OH-Al species in solution before and after reaction with smectites were determined by the kinetics of Al-Ferron reaction colour development. The composition of the Al species retained by smectites was not the same as that present in the original solution added. The slow-reacting complexes present in the solution were preferentially adsorbed by dioctahedral smectites. Smectites prepared from slow-reacting polymer solutions showed changes in interlayer separation, b–dimension, order along the c axis and spectroscopic properties, after storage at room temperature. The OH-Al Cheto-type montmorillonite prepared from both solutions showed more retention of Al, best stability at room temperature and after thermal treatment at 550°C than interlayered OH-Al Wyoming-type montmorillonite and OH-Al beidellite smectites.

Keywords

dioctahedral smectitesmontmorillointebeidelliteOH-Al complexes
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 1 , March 2001 , pp. 115 - 123
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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