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Precipitation of Iron(III) Hydroxides from Homogeneous Solutions

Published online by Cambridge University Press:  10 February 2011

Yiwei Deng
Yiwei Deng*
Affiliation:
Department of Chemistry, Florida International University, Miami, FL 33199
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Abstract

The technique of precipitation from homogeneous solutions was used in this study to simulate the formation of iron(III) hydroxides under conditions similar to those at the redox boundary in natural waters. The technique allowed the precipitation of iron(III) hydroxides to occur when the precipitant iron(III) was slowly generated by the oxygenation of iron(II) and subsequently hydrolyzed. During the precipitation, no pH heterogeneity occurred locally as it was usually observed in the conventional preparation of iron(III) hydroxides in the laboratory. Thus, the rapid hydrolysis of ferric ions and the subsequent polymerization of iron(III) hydroxides were effectively prevented. The iron(III) precipitates formed in this way are more representative of the iron(III) particles occurring at the redox boundary in natural waters than those formed by the conventional procedure in the laboratory. The effect of solutes (e.g., H4SiO4) on the structure, size and shape of the iron(llI) hydroxides formed has also be studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 432: Symposium S – Aqueous Chemistry and Geochemistry of Oxides , 1996 , 163
Copyright
Copyright © Materials Research Society 1997

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