- Title
- Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments
- Creator
- Rastegari, Mohammad; Karimian, Niloofar; Johnston, Scott G.; Doherty, Steven J.; Hamilton, Jessica L.; Choppala, Girish; Moghaddam, Mona Hosseinpour; Burton, Edward D.
- Relation
- Environmental Science and Technology Vol. 56, Issue 24, p. 17776-17784
- Publisher Link
- http://dx.doi.org/10.1021/acs.est.2c07341
- Publisher
- American Chemical Society (ACS)
- Resource Type
- journal article
- Date
- 2022
- Description
- 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.
- Subject
- antimonate; EXAGS; coprecipitation; Sb; shell fitting; wavelet transform
- Identifier
- http://hdl.handle.net/1959.13/1485606
- Identifier
- uon:51642
- Identifier
- ISSN:0013-936X
- Language
- eng
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