2020
DOI: 10.1021/acsestwater.0c00126
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Shewanella Drive Fe(III) Reduction to Promote Electro-Fenton Reactions and Enhance Fe Inner-Cycle

Abstract: The slow reduction of Fe­(III) to Fe­(II) in electro-Fenton technology limits pollutant removal and causes Fe sludge production. This study hypothesizes that Shewanella, a dissimilatory iron-reducing bacteria, can accelerate the iron reduction of the Fenton reaction. A Shewanella biofilm coupled with Fe2O3 coated electrode (F/S) was used to drive the electro-Fenton reaction, and compared the results with the singlet Fe2O3 (F) anode and Shewanella biofilm anode (S). Meanwhile, dissolved oxygen (DO) is studied a… Show more

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Cited by 12 publications
(9 citation statements)
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“…Figure b shows that the composition of Fe crystals was not affected by riboflavin; moreover, iron phosphate, iron hydroxide, and hematite were dominant with and without riboflavin addition. This result was consistent with a previous study . Therefore, it was concluded that the Fe nanoparticle film was stable on the anode.…”
Section: Resultssupporting
confidence: 93%
See 1 more Smart Citation
“…Figure b shows that the composition of Fe crystals was not affected by riboflavin; moreover, iron phosphate, iron hydroxide, and hematite were dominant with and without riboflavin addition. This result was consistent with a previous study . Therefore, it was concluded that the Fe nanoparticle film was stable on the anode.…”
Section: Resultssupporting
confidence: 93%
“…This result was consistent with a previous study. 26 Therefore, it was concluded that the Fe nanoparticle film was stable on the anode.…”
Section: Effects Of Riboflavin On the Fe Statusmentioning
confidence: 99%
“…was evaluated to maximise HO • generation as a driver of the Fenton mechanism that promotes the elimination of environmental contaminants. The results revealed that the bacteria could aggregate the formation of HO • and the electrochemical generation of H 2 O 2 [28]. Accordingly, this hypothesis provides significant insight into the potential for other strains in the Shewanella genus, perhaps MR-1, to perform a similar role, particularly in natural settings where heavy metal contamination is prevalent.…”
Section: Eet Process In Shewanella Oneidensis Mr-1mentioning
confidence: 75%
“…Because Fe(II) is notably more soluble than Fe(III), it is comparatively more abundant in bioavailable forms [13,17]. The weathering of rocks [18], reduction of numerous Fe(III) ligand complexes [19], and reduction of Fe(III)-bearing minerals such as ferrihydrite, goethite, hematite, magnetite, and lepidocrocite by dissimilatory iron(III)-reducing bacteria (DIRB) [20][21][22][23][24][25][26][27][28] are some of the processes that could result in the formation of Fe(II) in the environment. Interestingly, the geochemical cycling of Fe and Fe-bearing mineral dissolution affects the availability, mobility, sequestration, decomposition, and remediation of the associated metals such as cadmium (Cd), chromium (Cr), and As [21,[29][30][31][32][33][34][35][36][37][38].…”
Section: Introductionmentioning
confidence: 99%
“…7 a). Aiming to alleviate the slow cathodic iron reduction in the EF process, the iron-reducing bacteria Shewanella [ 87 ], dual cathode systems and pulsed current [ 37 ] have been recently explored. This is a serious issue, but not much attention has been paid so far because the cathodic Fe 3+ reduction in EF has been assumed as a comparable phenomenon to the homogenous iron reduction in non-electrochemical Fenton-based processes.…”
Section: Developments In the Ef Process In The Past Two Decadesmentioning
confidence: 99%