Journal article
Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments
Environmental science & technology
29/11/2022
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Source: InCites
Abstract
This study examines incorporation of Sb(V) into schwertmannite─an Fe(III) oxyhydroxysulfate mineral that can be an important Sb host phase in acidic environments. Schwertmannite was synthesized from solutions containing a range of Sb(V)/Fe(III) ratios, and the resulting solids were investigated using geochemical analysis, powder X-ray diffraction (XRD), dissolution kinetic experiments, and extended X-ray absorption fine structure (EXAFS) spectroscopy. Shell-fitting and wavelet transform analyses of Sb K-edge EXAFS data, together with congruent Sb and Fe release during schwertmannite dissolution, indicate that schwertmannite incorporates Sb(V) via heterovalent substitution for Fe(III). Elemental analysis combined with XRD and Fe K-edge EXAFS spectroscopy shows that schwertmannite can incorporate Sb(V) via this mechanism at up to about 8 mol % substitution when formed from solutions having Sb/Fe ratios ≤0.04 (higher ratios inhibit schwertmannite formation). Incorporation of Sb(V) into schwertmannite involves formation of edge and double-corner sharing linkages between SbVO6 and FeIII(O,OH)6 octahedra which strongly stabilize schwertmannite against dissolution. This implies that Sb(V)-coprecipitated schwertmannite may represent a potential long-term sink for Sb in acidic environments.
Details
- Title
- Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments
- Creators
- Mohammad RastegariNiloofar Karimian - Monash UniversityScott G Johnston - Southern Cross UniversitySteven J Doherty - University of New EnglandJessica L Hamilton - Australian SynchrotronGirish Choppala - University of Newcastle AustraliaMona Hosseinpour Moghaddam - Southern Cross UniversityEdward D Burton - Southern Cross University
- Publication Details
- Environmental science & technology
- Publisher
- American Chemical Society
- Identifiers
- 991013071610102368
- Copyright
- © 2022 American Chemical Society
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article