Journal ArticleDOI
The influence of copper on the transformation of ferrihydrite (5Fe2O3 · 9H2O) into crystalline products in alkaline media
R.M. Cornell,R. Giovanoli +1 more
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The presence of Cu retards the transformation of ferrihydrite (5Fe 2 O 3 · 9H 2 O) into crystalline products Low levels of Cu (9 mol%) suppress formation of goethite [(α-FeO(OH)] and lead to a product consisting entirely of haematite as mentioned in this paper.About:
This article is published in Polyhedron.The article was published on 1988-01-01. It has received 90 citations till now. The article focuses on the topics: Ferrihydrite & Goethite.read more
Citations
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Occurrence and Constitution of Natural and Synthetic Ferrihydrite, a Widespread Iron Oxyhydroxide
John L. Jambor,John E. Dutrizac +1 more
TL;DR: Effects of Various Ions on the Aqueous Transformation of Ferrihydrite and Environmental Implications 2576.
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Review of the hydrolysis of iron(III) and the crystallization of amorphous iron(III) hydroxide hydrate
TL;DR: In the case of amorphous iron(III) hydroxide hydrate, the main variable governing the rates at which these compounds form is pH and other important factors are temperature and the presence of additives as mentioned in this paper.
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A new approach to active supported Au catalysts
TL;DR: In this paper, a review of the key issues relevant to tremendous oxidation activity of supported Au catalysts was attempted to review the key features relevant to the existence of supported catalysts.
Journal ArticleDOI
Influence of Fe(II) on the formation of the spinel iron oxide in alkaline medium
TL;DR: In this paper, a phase diagram is proposed which schematizes the evolution of the coprecipitation products with x and with time, and two distinct species were coexisting: the one (m) was made up of ca. 4nm-sized particles with a low Fe(II) content (Fe(II)/Fe(III) ≈ 0.07), and the other (M) consisted of particles of larger, more or less distributed sizes, and composition Fe( II)/Fe (III) = 0.33; “M” increased relative amount with
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Coprecipitates of Cd, Cu, Pb and Zn in Iron Oxides:Solid Phase Transformation and Metal Solubility After Aging and Thermal Treatment
TL;DR: In this article, solid phase transformation and metal solubility were monitored after coprecipitation of Cd 2+, Cu 2+ and Zn 2+ with Fe 3+ to form ferrihydrite by titration to pH 6.
References
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Minerals formed by organisms
TL;DR: Biogenic minerals commonly have attributes which distinguish them from their inorganic counterparts, and they fulfill important biological functions.
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The Influence of Aluminum on Iron Oxides. VIII. Unit-Cell Dimensions of Al-Substituted Goethites and Estimation of Al From Them
TL;DR: In this article, an improved procedure for estimating Al substitution from x-ray powder diffraction positions requires (1) calculation of the c dimension from the positions of the 110 and 111 diffraction lines using the formula: c = (1/d(111)2 − 1/d (110)2)−1/2, and (2) estimation of Al substitutions from the relationship: mole % Al = 1730 − 572.0c.
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The Formation of Hematite from Amorphous Iron(III)Hydroxide
W. R. Fischer,U. Schwertmann +1 more
TL;DR: The formation of hematite from amorphous Fe(III)hydroxide in aqueous systems at pH 6 and 70°C, both with and without oxalate, was followed by kinetic measurements, electron microscopy and thermal analysis as mentioned in this paper.
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The influence of aluminium on iron oxides: X. Properties of Al-substituted goethites
TL;DR: In this article, the properties of goethites were characterized by a combination of Al substitution and structural defects, with Δa being a measure of the defects, and the effect of structural defects was opposite to that of Al substitutions.
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The influence of aluminum on iron oxides; Part II, Preparation and properties of Al-substituted hematites
TL;DR: Aluminum-substituted hematites (Fez-xAlxO3) were synthesized from Fe-A1 coprecipitates at pH 5.5, 7.0, and in 10 -1, 10-2, and 10 -2 M KOH at 700C as mentioned in this paper.