Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments
| Autor: | Mohammad Rastegari, Niloofar Karimian, Scott G. Johnston, Steven J. Doherty, Jessica L. Hamilton, Girish Choppala, Mona Hosseinpour Moghaddam, Edward D. Burton |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Environmental Science & Technology. 56:17776-17784 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.2c07341 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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