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• W4377294023 endingPage "138955" @default.
• W4377294023 startingPage "138955" @default.
• W4377294023 abstract "Whilst the oxidation of Fe(II) in aerobic conditions has been studied thoroughly, an in-depth knowhow on the fate or stability of Fe(II) in solutions with near-neutral pH under anaerobic conditions is still lacking. Here, we experimentally investigated the kinetics of Fe(II) oxidation in solutions with pH ranging between ∼5 and 9, under aerobic (when solutions were in equilibrium with atmospheric oxygen) and anaerobic conditions (when the dissolved oxygen concentration was ∼10-10 mol/L), by colorimetric means. Experimental results and thermodynamic considerations presented here, show that Fe(II) oxidation in anaerobic conditions is first-order w.r.t. [Fe(II)], and proceeds with set of parallel reactions involving different hydrolysed and non-hydrolysed Fe(II) and Fe(III) species, similar to that observed in aerobic conditions. However, in the absence of oxygen, the cathodic reaction accompanying the anodic oxidation of Fe(II), is the reduction of H2O (l) releasing H2 (g). Hydrolysed Fe(II) species oxidise much faster than Fe2+ and their concentrations increases with pH, leading to increased Fe(II) oxidation rates. Additionally, we also show the importance of the type of buffer used to study Fe(II) oxidation. Therefore, for the oxidation of Fe(II) in near-neutral solutions, the speciation of Fe(II) and Fe(III), the presence of other anions and the pH of the solution are critical parameters that must be considered. We anticipate that our results and hypothesis will find use in reactive-transport models simulating different processes occurring in anaerobic conditions such as corrosion of the steel in concrete structures, or in nuclear waste repositories." @default.
• W4377294023 created "2023-05-23" @default.
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• W4377294023 date "2023-09-01" @default.
• W4377294023 modified "2023-09-25" @default.
• W4377294023 title "Aerobic and anaerobic oxidation of ferrous ions in near-neutral solutions" @default.
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• W4377294023 doi "https://doi.org/10.1016/j.chemosphere.2023.138955" @default.
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