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Zinc immobilization by zerovalent Fe: surface chemistry and mineralogy of reaction products

Published online by Cambridge University Press:  05 July 2018

R. B. Herbert Jr.
R. B. Herbert Jr.*
Affiliation:
Department of Earth Sciences, Uppsala University, Villavägen 16, S – 753 26 Uppsala, Sweden
*
* E-mail: [email protected]
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Abstract

In bioreactor systems for the treatment of metal-contaminated water, pretreatment with zerovalent Fe can be exploited for oxygen consumption and H2 production. In this study, a column experiment is used to investigate the changes in surface chemistry and solid phase products that result from the reaction of a Zn-sulphate-lactate solution with zerovalent Fe filings. The results of this study indicate that zerovalent Fe is very effective in immobilizing dissolved Zn with a porewater residence time of 1.3 –3.1 days. A combination of X-ray diffractometry, X-ray photoelectron spectroscopy, and mineral equilibria calculations indicates that Zn precipitates as Zn(OH)2 and zincite at pH 9 –10. At pH ≈6, Zn primarily adsorbs to abundant ferric oxyhydroxides, although incorporation in green rust is also considered. During the course of the experiment, the surface mineralogy changes from magnetitelepidocrocite- goethite to green rust-akaganéite-goethite. The results suggest that the zerovalent Fe surface becomes passivated by a surface film of ferric oxyhydroxides, green rust and organic material, so that the rate of electron transfer and proton consuming reactions (i.e. oxygen consumption, H2 generation) declines, resulting in a decrease in solution pH.

Keywords

zinc immobilizationzerovalent Fegroundwater treatmentmetal contamination
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 6 , December 2003 , pp. 1285 - 1298
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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