Aqueous Vanadate Removal by Iron(II)-Bearing Phases under Anoxic Conditions

Vessey, Colton J.; Lindsay, Matthew B.J.

doi:10.1021/acs.est.9b06250

Cited by 31 publications

(54 citation statements)

References 72 publications

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“…The most rapid reduction was observed in the mackinawite system, where all V in the solids was reduced to V(III) by day 2 (Figure 10). These results are consistent with the rapid reduction of V(V) by mackinawite reported by Vessey and Lindsay [60]; however, they reported an average V valence state of only 3.65 within 2 days. The reason for the greater extent of reduction to V(III) in our study compared to that of Vessey and Lindsay is unclear.…”

Section: Change Of V Valence With Incubation Timesupporting

confidence: 91%

“…Vanadium(V) was reduced to V(III) in the siderite system (Figure 10). Reduction of V(V) by siderite has been reported by Vessey and Lindsay [60], where after 48 h of reaction, the average valence state of V was 4.14, which is similar to the average valence of 4.0 observed at 48 h in our siderite system. However, in our experiment the average V valence was 3.3 after 3 months with complete reduction to V(III) within 7 months.…”

Section: Change Of V Valence With Incubation Timesupporting

confidence: 90%

“…In contrast with mackinawite, green rust, BioGR, and siderite, V(V) was only partially reduced in the magnetite system. Within 48 h, the average valence state of V in our magnetite system was 4.7 and comparable to the average valence of 4.83 reported by Vessey and Lindsay after 48 h of reaction between V(V) and magnetite [60], suggesting similar reactivity for magnetite in both experimental systems. However, in both studies, the average valence states were measured for V associated with the solids (i.e., since the average valence was calculated from XANES analysis of the solids, the valence of V in solution was not included in the determination).…”

Section: Change Of V Valence With Incubation Timesupporting

confidence: 89%

“…Structural Fe(II) in magnetite and ilmenite (Fe(II)Ti(IV)O 3 ) can reduce V(V) to V(IV) over a pH range of 1-7, but the rate decreases markedly above pH 5 [59]. A recent study by Vessey and Lindsay [60] reported limited reduction of V(V) to V(IV) by magnetite, essentially complete reduction to V(IV) by siderite, and to V(IV), with possibly some V(III), by mackinawite. These results suggest that other Fe(II)-bearing minerals may also be effective reductants for V(V).…”

Section: Introductionmentioning

confidence: 99%

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Reduction of Vanadium(V) by Iron(II)-Bearing Minerals

2021

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Fe(II)-bearing minerals (magnetite, siderite, green rust, etc.) are common products of microbial Fe(III) reduction, and they provide a reservoir of reducing capacity in many subsurface environments that may contribute to the reduction of redox active elements such as vanadium; which can exist as V(V), V(IV), and V(III) under conditions typical of near-surface aquatic and terrestrial environments. To better understand the redox behavior of V under ferrugenic/sulfidogenic conditions, we examined the interactions of V(V) (1 mM) in aqueous suspensions containing 50 mM Fe(II) as magnetite, siderite, vivianite, green rust, or mackinawite, using X-ray absorption spectroscopy at the V K-edge to determine the valence state of V. Two additional systems of increased complexity were also examined, containing either 60 mM Fe(II) as biogenic green rust (BioGR) or 40 mM Fe(II) as a mixture of biogenic siderite, mackinawite, and magnetite (BioSMM). Within 48 h, total solution-phase V concentrations decreased to <20 µM in all but the vivianite and the biogenic BiSMM systems; however, >99.5% of V was removed from solution in the BioSMM and vivianite systems within 7 and 20 months, respectively. The most rapid reduction was observed in the mackinawite system, where V(V) was reduced to V(III) within 48 h. Complete reduction of V(V) to V(III) occurred within 4 months in the green rust system, 7 months in the siderite system, and 20 months in the BioGR system. Vanadium(V) was only partially reduced in the magnetite, vivianite, and BioSMM systems, where within 7 months the average V valence state stabilized at 3.7, 3.7, and 3.4, respectively. The reduction of V(V) in soils and sediments has been largely attributed to microbial activity, presumably involving direct enzymatic reduction of V(V); however the reduction of V(V) by Fe(II)-bearing minerals suggests that abiotic or coupled biotic–abiotic processes may also play a critical role in V redox chemistry, and thus need to be considered in modeling the global biogeochemical cycling of V.

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Section: Change Of V Valence With Incubation Timesupporting

confidence: 91%

Section: Change Of V Valence With Incubation Timesupporting

confidence: 90%

Section: Change Of V Valence With Incubation Timesupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reduction of Vanadium(V) by Iron(II)-Bearing Minerals

2021

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“…Amongst those, iron sulphides constitute a distinct group of solids and complexes that play a key role in marine systems and global biogeochemical sulphur cycles, which are central to fundamental concepts about the evolution of the Earth surface environment [11]. More importantly, they have been associated as catalysts in a number of key biochemical reactions related to Origin of Life theories [11][12][13][14][15][16][17], and more recently, as a potential electron source for autotrophic denitrification [18], as well as chromium [19] and vanadium removal [20]. Due to the variety in composition and structure of iron sulphides, a broad range of oxidation states is possible for both the iron and sulphur, which consequently makes these minerals remarkably reactive [8,21].…”

Section: Introductionmentioning

confidence: 99%

Changes in CO2 Adsorption Affinity Related to Ni Doping in FeS Surfaces: A DFT-D3 Study

et al. 2021

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Metal sulphides constitute cheap, naturally abundant, and environmentally friendly materials for energy storage applications and chemistry. In particular, iron (II) monosulphide (FeS, mackinawite) is a material of relevance in theories of the origin of life and for heterogenous catalytic applications in the conversion of carbon dioxide (CO2) towards small organic molecules. In natural mackinawite, Fe is often substituted by other metals, however, little is known about how such substitutions alter the chemical activity of the material. Herein, the effect of Ni doping on the structural, electronic, and catalytic properties of FeS surfaces is explored via dispersion-corrected density functional theory simulations. Substitutional Ni dopants, introduced on the Fe site, are readily incorporated into the pristine matrix of FeS, in good agreement with experimental measurements. The CO2 molecule was found to undergo deactivation and partial desorption from the doped surfaces, mainly at the Ni site when compared to undoped FeS surfaces. This behaviour is attributed to the energetically lowered d-band centre position of the doped surface, as a consequence of the increased number of paired electrons originating from the Ni dopant. The reaction and activation energies of CO2 dissociation atop the doped surfaces were found to be increased when compared to pristine surfaces, thus helping to further elucidate the role Ni could have played in the reactivity of FeS. It is expected that Ni doping in other Fe-sulphides may have a similar effect, limiting the catalytic activity of these phases when this dopant is present at their surfaces.

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Mobility of arsenic and vanadium in waterlogged calcareous soils due to addition of zeolite and manganese oxide amendments

et al. 2023

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Addition of manganese(IV) oxides (MnO2) and zeolite can affect the mobility of As and V in soils due to geochemical changes that have not been studied well in calcareous, flooded soils. This study evaluated the mobility of As and V in flooded soils surface‐amended with MnO2 or zeolite. A simulated summer flooding study was conducted for 8 weeks using intact soil columns from four calcareous soils. Redox potential was measured in soils, whereas pH, major cations, and As and V concentrations were measured biweekly in pore water and floodwater. Aqueous As and V species were modeled at 0, 4, and 8 weeks after flooding (WAF) using Visual MINTEQ modeling software with input parameters of redox potential, temperature, pH, total alkalinity, and concentrations of major cations and anions. Aqueous As concentrations were below the critical thresholds (<100 μg L−1), whereas aqueous V concentrations exceeded the threshold for sensitive aquatic species (2–80 μg L−1). MnO2‐amended soils were reduced to sub‐oxic levels, whereas zeolite‐amended and unamended soils were reduced to anoxic levels by 8 WAF. MnO2 decreased As and V mobilities, whereas zeolite had no effect on As but increased V mobility, compared to unamended soils. Arsenic mobility increased under anoxic conditions, and V mobility increased under oxic and alkaline pH conditions. Conversion of As(V) to As(III) and V(V) to V(IV) was regulated by MnO2 in flooded soils. MnO2 can be used as an amendment in immobilizing As and V, whereas the use of zeolite in flooded calcareous soils should be done cautiously.

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Aqueous Vanadate Removal by Iron(II)-Bearing Phases under Anoxic Conditions

Cited by 31 publications

References 72 publications

Reduction of Vanadium(V) by Iron(II)-Bearing Minerals

Reduction of Vanadium(V) by Iron(II)-Bearing Minerals

Changes in CO2 Adsorption Affinity Related to Ni Doping in FeS Surfaces: A DFT-D3 Study

Mobility of arsenic and vanadium in waterlogged calcareous soils due to addition of zeolite and manganese oxide amendments

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