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Stability of Mixed Iron and Aluminum Hydrous Oxides on Montmorillonite

Published online by Cambridge University Press:  01 July 2024

R. J. Tullock  and
C. B. Roth
R. J. Tullock
Affiliation:
Department of Agronomy, Purdue University, Lafayette, Indiana 47907, U.S.A.
C. B. Roth*
Affiliation:
Department of Agronomy, Purdue University, Lafayette, Indiana 47907, U.S.A.
*
†Temporary Assistant Professor and Assistant Professor of Agronomy, Agronomy Department, Purdue University, Lafayette, Indiana 47907, U.S.A.
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Abstract

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Montmorillonite clay samples were coated with 16 m-equiv/g of clay or iron plus aluminum as hydrous oxides and aged 1 yr, in suspensions of pH 6 or 8. The magnesium exchange capacity (MgEC) decreased linearly with the amount of non-crystalline aluminum hydrous oxide associated with the clay. Eight to 16 m-equiv of iron per g of clay reduced the MgEC by 20 m-equiv/100g at pH 6, but did not affect the MgEC at pH 8. The quantity of non-crystalline aluminum associated with the clay depended on the suspension pH and aging time, and was unaffected by the coprecipitation of 8–16 m-equiv of iron hydrous oxide/g clay. The crystalline form of aluminum hydrous oxide depended on the suspension pH and was shown by X-ray diffraction to be gibbsite at pH 6 and bayerite at pH 8. Gibbsite and bayerite formed rapidly with a rate dependent on the suspension pH when excess non-crystalline aluminum hydrous oxides were present. The quantity of non-crystalline aluminum hydrous oxides remaining after one year in suspensions of iron hydrous oxides and montmorillonite varied from 2·3 m-equiv/g of montmorillonite at pH 8-4·0 m-equiv/g of montmorillonite at pH 6. Differential thermal analysis and MgEC measurements indicated some regular organization of the iron hydrous oxides, however, crystalline iron minerals were not detected by X-ray diffraction.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 1 , February 1975 , pp. 27 - 32
Copyright
Copyright © 1975, The Clay Minerals Society

Footnotes

*

Journal Paper 5418, Purdue University, Agricultural Experiment Station, Lafayette, Indiana, U.S.A.

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