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Aqueous vanadate removal by iron(II)-bearing phases under anoxic conditions

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dc.contributor.authorVessey, Colton
dc.contributor.authorLindsay, Matthew B. J.
dc.date.accessioned2022-10-25T20:38:45Z
dc.date.available2022-10-25T20:38:45Z
dc.date.issued2020-03-06
dc.descriptionCopyright © 2020 American Chemical Societyen_US
dc.description.abstractVanadium contamination is a growing environmental hazard worldwide. Aqueous vanadate (HxVVO4(3−x)− (aq)) concentrations are often controlled by surface complexation with metal (oxyhydr)oxides in oxic environments. However, the geochemical behaviour of this toxic redox sensitive oxyanion in anoxic environments is poorly constrained. Here we describe results of batch experiments to determine kinetics and mechanisms of aqueous H2VVO4− (100 μM) removal under anoxic conditions in suspensions (2.0 g L−1) of magnetite, siderite, pyrite, and mackinawite. We present results of parallel experiments using ferrihydrite (2.0 g L−1) and Fe2+(aq) (200 μM) for comparison. Siderite and mackinawite reached near complete removal (46 µmol g−1) of aqueous vanadate after 3 h and kinetic rates were generally consistent with ferrihydrite. Whereas magnetite removed 18 µmol g−1 of aqueous vanadate after 48 h and uptake by pyrite was limited. Uptake by Fe2+(aq) was observed after 8 h, concomitant with precipitation of secondary Fe phases. X ray absorption spectroscopy revealed V(V) reduction to V(IV) and formation of bidentate corner-sharing surface complexes on magnetite and siderite, and with Fe2+(aq) reaction products. These data also suggest that V(IV) is incorporated into the mackinawite structure. Overall, we demonstrate that Fe(II)-bearing phases can promote aqueous vanadate attenuation and, therefore, limit dissolved V concentrations in anoxic environments.en_US
dc.description.sponsorshipFunding was provided by the Natural Sciences and Engineering Council of Canada (NSERC) through the Discovery Grants program (Grant No. RGPIN-2014-06589). Additional support awarded to CJV through NSERC – Canada Graduate Scholarship – Masters (NSERC CGS-M) Program. A portion of the research described was performed at the Canadian Light Source, which is supported by the Canada Foundation for Innovation, NSERC, the University of Saskatchewan, the Government of Saskatchewan, Western Economic Diversification Canada, the National Research Council, and the Canadian Institutes of Health Research.en_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationVessey, C.J. & Lindsay, M.B.J. (2020). Aqueous vanadate removal by iron(II)-bearing phases under anoxic conditions. Environmental Science & Technology, 54(7): 4006–4015. https://doi.org/10.1021/acs.est.9b06250en_US
dc.identifier.doi10.1021/acs.est.9b06250
dc.identifier.urihttps://hdl.handle.net/10388/14269
dc.language.isoenen_US
dc.publisherAmerican Chemical Society (ACS) Publicationsen_US
dc.subjectanionsen_US
dc.subjectextended X-ray absorption fine structureen_US
dc.subjectmagnetiteen_US
dc.subjectoxidation stateen_US
dc.subjectredox reactionsen_US
dc.titleAqueous vanadate removal by iron(II)-bearing phases under anoxic conditionsen_US
dc.typeArticleen_US

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