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

Environ Sci Technol. 2020 Apr 7;54(7):4006-4015. doi: 10.1021/acs.est.9b06250. Epub 2020 Mar 16.

Abstract

Vanadium 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 behavior 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 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. Removal during reaction with 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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Ferric Compounds*
  • Ferrosoferric Oxide
  • Ferrous Compounds
  • Oxidation-Reduction
  • Vanadates*
  • Water
  • X-Ray Absorption Spectroscopy

Substances

  • Ferric Compounds
  • Ferrous Compounds
  • Water
  • Vanadates
  • Ferrosoferric Oxide

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