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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
Antimony sorption to schwertmannite in acid sulfate environments
Journal of Hazardous Materials, Vol.478, 135545
05/10/2024
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Abstract
Schwertmannite is a poorly-crystalline Fe(III) oxyhydroxysulfate mineral that may control Sb(V) mobility in acid sulfate environments, including acid mine drainage and acid sulfate soils. However, the mechanisms that govern uptake of aqueous Sb(V) by schwertmannite in such environments are poorly understood. To address this issue, we examined Sb(V) sorption to schwertmannite across a range of environmentally-relevant Sb(V) loadings at pH 3 in sulfate-rich solutions. Antimony K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy revealed that Sb(V) sorption (at all loadings) involved edge and double-corner sharing linkages between SbVO6 and FeIIIO6 octahedra. The coordination numbers for these linkages indicate that sorption occurred by Sb(V) incorporation into the schwertmannite structure via heterovalent Sb(V)-for-Fe(III) substitution. As such, Sb(V) sorption to schwertmannite was not limited by the abundance of surface complexation sites and was strongly resistant to desorption when exposed to 0.1 M PO43-. Sorption of Sb(V) also conferred increased stability to schwertmannite, based on changes in the schwertmannite dissolution rate during extraction with an acidic ammonium oxalate solution. This study provides new insights into Sb(V) sorption to schwertmannite in acid sulfate environments, and highlights the role that schwertmannite can play in immobilizing Sb(V) within its crystal structure.
Details
- Title
- Antimony sorption to schwertmannite in acid sulfate environments
- Creators
- Mohammad Rastegari (Author) - Southern Cross University, Faculty of Science and EngineeringNiloofar Karimian (Author) - Monash UniversityScott G Johnston (Author) - Southern Cross University, ScienceGirish Choppala (Author) - University of NewcastleMona Hosseinpour Moghaddam (Author) - Southern Cross UniversityEdward D Burton (Author) - Southern Cross University, Science
- Publication Details
- Journal of Hazardous Materials, Vol.478, 135545
- Publisher
- Elsevier BV
- Grant note
Funding was provided by the Australian Research Council under project FT200100449, with additional funding provided by Southern Cross University. X-ray Absorption Spectroscopy was conducted on the XAS and MEX-1 beamlines at the Australian Synchrotron via funding from the Australian Nuclear Science and Technology Organisation. We thank Jessica Hamilton and Jeremy Wykes for providing technical assistance during data collection on the XAS and MEX-1 beamline, respectively. Analytical support was provided by the Environmental Analysis Laboratory (EAL) , which is a Southern Cross University research support facility.r Cross University. X-ray Absorption Spectroscopy was conducted on the XAS and MEX-1 beamlines at the Australian Synchrotron via funding from the Australian Nuclear Science and Technology Organisation. We thank Jessica Hamilton and Jeremy Wykes for providing technical assistance during data collection on the XAS and MEX-1 beamline, respectively. Analytical support was provided by the Environmental Analysis Laboratory (EAL) , which is a Southern Cross University research support facility.
- Identifiers
- 991013214112802368
- Copyright
- Crown Copyright © 2024 Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article