Mechanism of Uranium Removal from the Aqueous Solution by Elemental Iron
Preprint2006
Noubactep, C.; Schöner, A.; Meinrath, G., 2006: Mechanism of Uranium Removal from the Aqueous Solution by Elemental Iron. In: Noubactep, C.; Schöner, A.; Meinrath, G. (2006): Mechanism of Uranium Removal from the Aqueous Solution by Elemental Iron, DOI: 10.23689/fidgeo-2728.
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The effectiveness of elemental iron (Fe0) to remove uranium (U) from the aqueous phase has
been demonstrated. While the mitigation effect is sure, discrepancies in the removal
mechanism have been reported. The objective of this study was to investigate the mechanism
of U(VI) removal from aqueous phases by Fe0. For this purpose a systematic sequence of bulk
experiments was conducted to characterize the effects of the availability and the abundance of
corrosion products on U(VI) removal. Results indicated that U(VI) removal reactions did not
primary occur at the surface of the metallic iron. It is determined that U(VI) co-precipitation
with aging corrosion products is a plausible explanation for the irreversible fixation under
experimental conditions. Results of XRD analyses did no show any U phases, whereas SEMEDX
analyses showed that U tended to associate with rusted areas on the surface of Fe0.
Recovering U with different leaching solutions varied upon the dissolution capacity of the
individual solutions for corrosion products, showing that the irreversibility of the removal depends on the stability of the corrosion products. U(VI) co-precipitation as removal
mechanism enables a better discussion of reported discrepancies.
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