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Iron Atom Exchange between Hematite and Aqueous Fe(II).

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Aqueous iron(II) exchanges with structural iron(III) in hematite, a common iron oxide. This process is influenced by particle size, pH, and iron(II) concentration, revealing accessible iron atoms within hematite.

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Mineralogy

Background:

  • Aqueous iron(II) interacts with iron oxides, but its exchange with structural iron(III) in hematite is not well understood.
  • Hematite is a thermodynamically stable and ubiquitous iron oxide mineral.

Purpose of the Study:

  • To investigate the exchange of aqueous iron(II) with structural iron(III) in hematite.
  • To determine factors influencing this exchange reaction, including particle size, pH, and iron(II) concentration.

Main Methods:

  • Utilized an enriched (57)Fe tracer to track atom exchange.
  • Experimented with varying hematite particle sizes (80 nm and 50 nm), pH levels (6.5-8.0), and aqueous iron(II) concentrations.
  • Analyzed the extent of structural iron(III) exchange with aqueous iron(II).

Main Results:

  • Demonstrated that aqueous iron(II) exchanges with structural iron(III) in hematite at room temperature.
  • Showed that smaller hematite particles (50 nm) exhibit significantly higher exchange rates (∼25%) compared to larger particles (80 nm, ∼5%).
  • Observed that exchange increases with pH up to 7.5 and is affected by surface saturation with iron(II).

Conclusions:

  • Aqueous iron(II) can catalyze iron atom exchange within the bulk structure of hematite.
  • Structural iron(III) in hematite is accessible to aqueous iron(II), particularly in smaller particles.
  • Particle size, pH, and iron(II) concentration are critical parameters controlling iron exchange in hematite systems.