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• W3046176125 abstract "The mechanism of long-distance electron transfer via redox-active particulate natural organic matter (NOM) is still unclear, especially considering its aggregated nature and the resulting low diffusivity of its quinone- and hydroquinone-containing molecules. Here we conducted microbial iron(III) mineral reduction experiments in which anthraquinone-2,6-disulfonate (AQDS, a widely used analogue for quinone- and hydroquinone-containing molecules in NOM) was immobilized in agar to achieve a spatial separation between the iron-reducing bacteria and ferrihydrite mineral. Immobilizing AQDS in agar also limited its diffusion, which resembled electron-transfer behavior of quinone- and hydroquinone-containing molecules in particulate NOM. We found that, although the diffusion coefficient of the immobilized AQDS/AH2QDS was 10 times lower in agar than in water, the iron(III) mineral reduction rate (1.60 ± 0.28 mmol L–1 Fe(II) d–1) was still comparable in both media, indicating the existence of another mechanism that accelerated the electron transfer under low diffusive conditions. We found the correlation between the heterogeneous electron-transfer rate constant (10–3 cm s–1) and the diffusion coefficient (10–7 cm2 s–1) fitting well with the “diffusion-electron hopping” model, suggesting that electron transfer via the immobilized AQDS/AH2QDS couple was accomplished through a combination of diffusion and electron hopping. Electron hopping increased the diffusion concentration gradient up to 106-fold, which largely promoted the overall electron-transfer rate during microbial iron(III) mineral reduction. Our results are helpful to explain the electron-transfer mechanisms in particulate NOM." @default.
• W3046176125 created "2020-08-03" @default.
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• W3046176125 date "2020-07-27" @default.
• W3046176125 modified "2023-10-16" @default.
• W3046176125 title "Electron Hopping Enables Rapid Electron Transfer between Quinone-/Hydroquinone-Containing Organic Molecules in Microbial Iron(III) Mineral Reduction" @default.
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• W3046176125 doi "https://doi.org/10.1021/acs.est.0c02521" @default.
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• W3046176125 hasPublicationYear "2020" @default.
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