The effect of Antimonate, Arsenate, and Phosphate on the Tranformation of Ferrihydrite to Goethite, Hematite, Feroxyhyte, and Tripuhyite

Bolanz, Ralph Michael and Blaess, Ulrich and Ackermann, Sonia and Ciobotae, Valerian and Roesch, Petra and Tarcea, Nicolae and Popp, Juergen and Majzlan, Juraj. (2013) The effect of Antimonate, Arsenate, and Phosphate on the Tranformation of Ferrihydrite to Goethite, Hematite, Feroxyhyte, and Tripuhyite. Clays and Clay Minerals, 61 (1-2). pp. 11-25.

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Iron oxides, typical constituents of many soils, represent a natural immobilization mechanism for toxic elements. Most iron oxides are formed during the transformation of poorly crystalline ferrihydrite to more crystalline iron phases. The present study examined the impact of well known contaminants, such as P(V), As(V), and Sb(V), on the ferrihydrite transformation and investigated the transformation products with a set of bulk and nano-resolution methods. Irrespective of the pH, P(V) and As(V) favor the formation of hematite (alpha-Fe2O3) over goethite (alpha-FeOOH) and retard these transformations at high concentrations. Sb(V), on the other hand, favors the formation of goethite, feroxyhyte (delta'-FeOOH), and tripuhyite (FeSbO4) depending on pH and Sb(V) concentration. The elemental composition of the transformation products analyzed by inductively coupled plasma optical emission spectroscopy show high loadings of Sb(V) with molar Sb:Fe ratios of 0.12, whereas the molar P:Fe and As:Fe ratios do not exceed 0.03 and 0.06, respectively. The structural similarity of feroxyhyte and hematite was resolved by detailed electron diffraction studies, and feroxyhyte was positively identified in a number of the samples examined. These results indicate that, compared to P(V) and As(V), Sb(V) can be incorporated into the structure of certain iron oxides through Fe(III)-Sb(V) substitution, coupled with other substitutions. However, the outcome of the ferrihydrite transformation (hematite, goethite, feroxyhyte, or tripuhyite) depends on the Sb(V) concentration, pH, and temperature.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Mineralogie-Petrographie
11 Rektorat und Verwaltung > Vizerektorat Forschung
UniBasel Contributors:Ackermann Krzemnicki, Sonia
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Clay Minerals Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Nov 2020 16:04
Deposited On:30 Nov 2020 16:04

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