Rastegari, Mohammad; Karimian, Niloofar; Johnston, Scott G; Doherty, Steven J; Hamilton, Jessica L; Choppala, Girish; Hosseinpour Moghaddam, Mona; Burton, Edward D

Author(s)

Rastegari, Mohammad

Karimian, Niloofar

Johnston, Scott G

Doherty, Steven J

Hamilton, Jessica L

Choppala, Girish

Hosseinpour Moghaddam, Mona

Burton, Edward D

Publication Date

2022-11-29

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.

Citation

Environmental Science & Technology, 56(24), p. 17776-17784

ISSN

1520-5851

0013-936X

Pubmed ID

36445713

Link

https://hdl.handle.net/1959.11/62376

Publisher

American Chemical Society

Title

Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments

Type of document

Journal Article

Entity Type

Publication

Author(s)	Rastegari, Mohammad Karimian, Niloofar Johnston, Scott G Doherty, Steven J Hamilton, Jessica L Choppala, Girish Hosseinpour Moghaddam, Mona Burton, Edward D
Publication Date	2022-11-29
Abstract	<p>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 Sb<sup>V</sup>O<sub>6</sub> and Fe<sup>III</sup>(O,OH)<sub>6</sub> 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.</p>
Citation	Environmental Science & Technology, 56(24), p. 17776-17784
ISSN	1520-5851 0013-936X
Pubmed ID	36445713
Link	https://hdl.handle.net/1959.11/62376
Publisher	American Chemical Society
Title	Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments
Type of document	Journal Article
Entity Type	Publication

Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments

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