Abstract
Reaction with Na2S solutions at high pH led to almost complete, reversible reduction of iron in montmorillonite, whereas the structural iron of nontronite persisted in the ferric form. Concentrated Na2S solutions caused severe corrosion of nontronite and extracted appreciable amounts of iron, which was precipitated as sulphides. In contrast the morphology of montmorillonite was preserved and only very minor amounts of iron were extracted. These differences were attributed to the high concentration of Fe-OH-Fe groups in nontronite, which are unstable on reduction. The difference between Na2S and other reducing agents is discussed.
Similar content being viewed by others
References
Morice, J. A., Rees, L. V. C. and D. T. Rickard (1969) Mössbauer studies of iron sulphides: J. inorg. nucl. Chem. 31, 3797–3802.
Rickard, D. T. (1969) The microbiological formation of iron sulphides: Acta Universitatis Stockholmiensis, Stockholm Contributions in Geology 29, 49–66.
Rozenson, I. and L. Heller-Kallai (1976) Reduction and oxidation of Fe3+ in dioctahedral smectites — 1: Reduction with hydrazine and dithionite: Clays & Clay Minerals 24, 271–282.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rozenson, I., Heller-Kallai, L. Reduction and Oxidation of Fe3+ in Dioctahedral Smectites — 2: Reduction with Sodium Sulphide Solutions. Clays Clay Miner. 24, 283–288 (1976). https://doi.org/10.1346/CCMN.1976.0240602
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1346/CCMN.1976.0240602