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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Ferrous iron oxidation in the presence of antimonate at neutral pH: Mutual effects on iron mineral products and antimony sequestration
Journal of hazardous materials, Vol.488, pp.1-8
05/05/2025
PMID: 39884040
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Abstract
Antimony is a priority pollutant, whose mobility in redox-dynamic environments may be controlled by interactions with Fe(III) hydroxide minerals that form via Fe(II) oxidation. In this study, we examined the Fe(III) hydroxide precipitates and associated mechanisms of Sb(V) sequestration that result from Fe(II) oxidation in the presence of Sb(V) under neutral pH conditions. To achieve this aim, oxidation experiments were carried out in O2-saturated, Fe(II)-bearing solutions (buffered at pH 7) over a range of environmentally relevant Sb(V) concentrations (equivalent to Sb(V):Fe(II) molar ratios of 0, 0.01, 0.04, 0.1 and 0.25). Under these experimental conditions, Fe(II) oxidation occurred rapidly (within 20 minutes) causing associated removal of Sb(V) from solution via coprecipitation with the resulting Fe(III) hydroxides. At low Sb(V):Fe(II) ratios (< 0.1), lepidocrocite was the only Fe(III) mineral product of Fe(II) oxidation, whereas higher ratios resulted in formation of feroxyhyte. Both lepidocrocite and feroxyhyte retained Sb(V) within their crystal structure via Sb(V)-for-Fe(III) substitution. This mechanism of Sb(V) retention largely protected the solid-phase Sb(V) from release processes. Collectively, these results highlight the coupled role that interactions between Sb geochemistry and the Earth’s near-surface Fe cycle can play in controlling both Fe(III) hydroxide mineralogy and Sb mobility.
Details
- Title
- Ferrous iron oxidation in the presence of antimonate at neutral pH: Mutual effects on iron mineral products and antimony sequestration
- Creators
- L Wegner - University of BayreuthE D Burton - Southern Cross UniversityC McCammon - University of BayreuthA C Scheinost - European Synchrotron Radiation FacilityB Planer-Friedrich - University of BayreuthS Peiffer - University of BayreuthK Hockmann - University of Freiburg
- Publication Details
- Journal of hazardous materials, Vol.488, pp.1-8
- Publisher
- Elsevier B.V
- Grant note
- Funding from the Germany Academic Exchange Service (DAAD-PPP Australia grant no. 57446537), the Australian Research Council (grant no. FT200100449) and by the Female Professor Programme of Germany's Federal Ministry of Education and Research (BMBF), the Equal Opportunities Department at University of Bayreuth as well as the Heinrich Böll Foundation are gratefully acknowledged.
- Identifiers
- 991013258463802368
- Copyright
- © 2025 The Authors.
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article