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The effect of dry heating on the chemistry, surface area, and oxalate solubility of synthetic 2-line and 6-line ferrihydrites

Published online by Cambridge University Press:  09 July 2018

H. Stanjek  and
P. G. Weidler
H. Stanjek
Affiliation:
Lehrstuhl für Bodenkunde der Technischen Universität München, D-8050 Freising-Weihenstephan, Germany
P. G. Weidler
Affiliation:
Lehrstuhl für Bodenkunde der Technischen Universität München, D-8050 Freising-Weihenstephan, Germany
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Abstract

Synthetic 2-line and 6-line ferrihydrites were heated to 400 K, 500 K and 600 K, under dry conditions. Heating to 400 K lowered the ratios of structural OH to Fe2O3 without a phase transformation. The lowest ratios observed at 400 K were 1·23 (2-line) and 0·85 (6-line ferrihydrite) after 1150 h. For 6-line ferrihydrites heated to 400 K, the solubility in oxalate and the BET surface areas decreased with increasing heating time, whereas the unit-cell parameters, the relative peak intensities and the mean coherence lengths did not change significantly. Heating the 2-line ferrihydrites to 400 K produced microporosity.

Type
Research Article
Information
Clay Minerals , Volume 27 , Issue 4 , December 1992 , pp. 397 - 411
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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