• Understanding the Importance of Labile Fe(III) during Fe(II)-Catalyzed Transformation of Metastable Iron Oxyhydroxides

    Juan Liu et al, ES&T, 2022

  • Labile Fe(III) supersaturation controls nucleation and properties of product phases from Fe(II)-catalyzed ferrihydrite transform

    Anxu Sheng, Juan Liu*, GCA, 2021

  • Sunlight-triggered Synergy of Hematite and Shewanella oneidensis MR-1 in Cr(VI) Removal

    Hang Cheng et al. GCA, 2021

  • Redistribution of Electron Equivalents between Magnetite and Aqueous Fe2+ Induced by a Model Quinone Compound AQDS

    Peng,H, Liu,Juan*,Environ. Sci. Technol., 2019

  • Dissolution Behavior of Isolated and Aggregated Hematite Particles Revealed by in Situ Liquid Cell Transmission Electron Microsc

    Li, Xiaoxu et al., ES&T, 2019

  • Reversible Fe(II) uptake/release by magnetite nanopartocles

    Peng, Huan et al Environ. Sci.: Nano, 2018, 5, 1545

  • Enhanced photocurrent production by the synergy of hematite nanowire-arrayed photoanode and bioengineered Shewanella oneidensis

    Zhu G, Yun Y, Liu J, et al. Biosensors & Bioelectronics, 2017, 94:227.

  • Extracellular electron transfer mechanisms between microorganisms and minerals

    Nature Reviews Microbiology volume 14, pages 651–662 (2016)

Recent Publications

Sheng A, Deng Y, Ding Y, Cheng L, Liu Y, Li X, Arai Y, Liu J. Regulation of ferrihydrite biotransformation by Fe(II) supply rates and extracellular polymeric substances. Geochimica et Cosmochimica Acta [Internet]. 2024. 访问链接Abstract
Biotransformation of ferrihydrite (Fh) by dissimilatory iron-reducing bacteria (DIRB) into various secondary minerals assemblages widely occurs in anaerobic environments. While respiration-driven supply rates of Fe(II) have been proposed as a primary factor controlling kinetics and mineral products of this process, the specific mechanism by which DIRB respiration rates regulate Fh biotransformation remains elusive. Here, to minimize the complex effects of microbial cells, we conducted Fh transformation using 1 mM biogenic Fe(II) (BioFe(II)), added at different rates to mimic diverse respiration-driven supply rates of Fe(II) by DIRB. For comparison, transformation experiments with FeSO4 alone and FeSO4 plus citrate (CitFe(II)) added at the corresponding supply rates were performed to decouple the specific effects of Fe(II) addition rates and extracellular polymeric substances (EPS) associated with BioFe(II). Decreasing FeSO4 supply rates favored the transformation of Fh to lepidocrocite (Lp) over to Gt and the subsequent transformation of Lp to magnetite (Mt), altering the transformation pathway from Fh → Lp/Gt → Gt to Fh → Lp/Gt → Mt/Gt. These results underscore the significant effect of aqueous Fe(II) supply rates on the competition of olation and oxolation of labile Fe(III) intermediates into different secondary minerals. In the experiments with BioFe(II) and CitFe(II), although EPS or citrate slightly increased Fe(II) adsorption and Fe(III)labile generation, the increase in sorbed Fe(II) was minimal compared to the variations in aqueous Fe(II) concentrations caused by the different Fe(II) supply rates. At the same Fe(II) supply rates, EPS or citrate notably inhibited the transformation of Fh to Gt and the further conversion of Lp, altering the pathway from Fh → Mt/Gt/Lp to primarily Fh → Lp. These effects became more pronounced with the decrease of BioFe(II) and CitFe(II) supply rates. Our findings provide new insights into how DIRB respiration rates control kinetics, pathways, and mineral products of Fh transformation, which is crucial for elucidating the relevant biogeochemical cycling of nutrients and (im)mobilization of contaminants.
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