Influence of ruthenium ions on the precipitation of α-FeOOH, α-Fe2O3 and Fe3O4 in highly alkaline media

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作者：
Krehula, Stjepko [1 ]
Musić, Svetozar [1 ]
机构：
[1] Division of Materials Chemistry, Ruder Bošković Institute, P.O. Box 180, HR-10002 Zagreb, Croatia
来源：
Journal of Alloys and Compounds | 2006年 / 416卷 / 1-2期
关键词：
The influence of ruthenium ions on the precipitation of goethite (α-FeOOH); α-Fe2O3 and Fe3O4 in highly alkaline media was investigated by 57Fe Mössbauer and FT-IR spectroscopies; thermal field emission scanning electron microscope (FE SEM) and EDS. The presence of Ru-dopant strongly affected the precipitation of α-FeOOH at highly alkaline pH; i.e. the formation of α-Fe2O3 was also noticed. A decrease of hyperfine magnetic field (HMF) at RT from 35.1 T (undoped α-FeOOH) to 31.3 T for sample with [Ru]/([Ru] + [Fe]) = 0.0196 was assigned to the incorporation of ruthenium ions into the α-FeOOH structure. Mössbauer spectroscopy showed the formation of stoichiometric Fe3O4 for [Ru]/([Ru] + [Fe]) = 0.0291-0.0909. α-Fe2O3 and Fe3O4 did not show a tendency to the formation of solid solutions with ruthenium ions. FE SEM observations of the samples showed that reference α-FeOOH sample contained acicular particles of good uniformity; which increased the length up to ∼5 times with increase of concentration of ruthenium ions. On the other hand; large octahedral Fe3O4 crystals (particles) were associated with small particles of ruthenium (hydrous) oxide with a size in the range ∼100 nm or less. A possible catalytic action of ruthenium that created reduction conditions for Fe3+ ions and formation of Fe2+ ions for precipitation of Fe3O4 was discussed. © 2005 Elsevier B.V. All rights reserved;
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