Effects of particle size and AQDS on the flow of electron equivalents between magnetite and aqueous Fe2+

Peng, Huan; Zhu, Zhenli; Pearce, Carolyn I.; Sheng, Anxu; Nie, Mingjun; N'Diaye, Alpha T.; Zhang, Xin; Rosso, Kevin M.; Liu, Juan

doi:10.1016/j.gca.2024.04.010

Effects of particle size and AQDS on the flow of electron equivalents between magnetite and aqueous Fe2+

Journal Article · Wed May 15 04:00:00 EDT 2024 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/j.gca.2024.04.010· OSTI ID:2439997

Peng, Huan ^[1]; Zhu, Zhenli ^[2]; Pearce, Carolyn I. ^[3]; ^[1]; Nie, Mingjun ^[4]; N'Diaye, Alpha T. ^[5]; Zhang, Xin ^[3]; ^[3]; Liu, Juan ^[1]

Peking University
China University of Geosciences
BATTELLE (PACIFIC NW LAB)
Peking University, Beijing
Lawrence Berkeley National Laboratory

Magnetite can occur naturally in nano- to micro-size regimes and widely coexists with aqueous Fe2+ (Fe2+ (aq)) in natural environments. However, the effects of magnetite particle size on its interaction with Fe2+ (aq) in anoxic subsurface environments, particularly with redox-active organics, remain unclear. In this study, the interactions of Fe2+ (aq) with magnetite particles of 12 nm versus 109 nm (Mag-12 vs. Mag-109), with/without anthraquinone- 2,6-disulfonate (AQDS), were studied based on equilibrium Fe2+ (aq) concentrations, kinetics of AQDS reduction, and structural versus surface-localized Fe(II)/Fe(III) ratios (xstru and xsurf) of magnetite. In the absence of AQDS, Mag-12 tends to release Fe2+ (aq) at pH 7 but sorb Fe2+ (aq) at pH 8, while Fe2+ (aq) uptake by Mag-109 is observed at both pH 7 and 8. The amounts of Fe2+ (aq) adsorbed per unit area of Mag-109 is higher than that of Mag-12, due to the higher electron-accepting capacity of Mag-109 that facilitates interfacial electron transfer (IET) from surfaceassociated Fe(II) to structural Fe(III). The increases of xstru and xsurf in Mag-109 after reaction with Fe2+ (aq) at pH 7 and 8 suggest Fe2+ (aq) incorporation or electron injection into the structure of Mag-109. The presence of AQDS promotes Fe2+ (aq) uptake by both Mag-12 and Mag-109. However, AQDS reduction by Fe2+-amended Mag-12 results in the decrease of xstru and inhibits Fe2+ (aq) incorporation or electron injection into the structure. On the contrary, the increase of xstru observed in Fe2+-amended Mag-109 after reaction with AQDS suggests that Fe2+ (aq) incorporation or electron injection into the surface structure and then consequently into the interiors is more favorable for magnetite with larger particle sizes. The different flow directions of electron equivalents across the solid-solution interfaces can be attributed to the relatively higher electron-accepting capacity, i.e. redox potential, of Mag-109 than Mag-12; larger particle sizes facilitate IET from surface-associated Fe(II) to structural Fe(III) and promotes further Fe2+ (aq) uptake, culminating in the pronounced changes of redox potentials in magnetitebearing solutions. The results demonstrate that particle size and redox-active organics are important factors to affect reductive activity of Fe2+-magnetite system in redox-oscillating environments.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 2439997

Report Number(s):: PNNL-SA-197855

Journal Information:: Geochimica et Cosmochimica Acta, Journal Name: Geochimica et Cosmochimica Acta Journal Issue: _ Vol. 373

Country of Publication:: United States

Language:: English

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