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Reduction of Fe(III) in a high-iron saponite. Pillaring of the reduced samples with Al13 oligomers

Published online by Cambridge University Press:  09 July 2018

M. A. Vicente ,
M. Suarez ,
M. A. Bañares-Muñoz  and
J. M. M. Pozas
M. A. Vicente
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad de Salamanca, Plaza de la Merced S/N, 37008-Salamanca, Spain
M. Suarez
Affiliation:
Area de Mineralogía y Cristalografía, Departamento de Geología, Facultad de Ciencias, Universidad de Salamanca, Plaza de la Merced S/N, 37008-Salamanca, Spain
M. A. Bañares-Muñoz
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad de Salamanca, Plaza de la Merced S/N, 37008-Salamanca, Spain
J. M. M. Pozas
Affiliation:
Area de Mineralogía y Cristalografía, Departamento de Geología, Facultad de Ciencias, Universidad de Salamanca, Plaza de la Merced S/N, 37008-Salamanca, Spain
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Abstract

A high-iron content saponite, of the variety griffithite, was reduced using sodium dithionite and hydrazonium sulphate solutions. An important amount of Fe3+ was reduced during the treatments. When using sodium dithionite as reducing agent, the reduction was accompanied by the substitution of Ca2+ by Na+ as the exchangeable cation. When using hydrazonium sulphate, the reduction was accompanied by acid activation of the clay, the protons being released in the oxidation reaction of the hydrazonium cation. The charge balance in the clay layers is affected by the reduction processes. These structural changes do not significantly affect the pillaring ability of the clay, which is similar in the reduced solids and in the natural griffithite.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 2 , June 1998 , pp. 213 - 220
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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