Mechanism and applications of bidirectional extracellular electron transfer of <i>Shewanella</i>

Zang, Yuxuan; Cao, Bo; Zhao, Hongyu; Xie, Beizhen; Ge, Yanhong; Liu, Hong; Yi, Yue

doi:10.1039/d3em00224a

Environ. Sci.: Processes Impacts

2023

DOI: 10.1039/d3em00224a

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Mechanism and applications of bidirectional extracellular electron transfer of Shewanella

Yuxuan Zang,

Bo Cao,

Hongyu Zhao

et al.

Abstract: Electrochemically active microorganisms (EAMs) play an important role in the fields of environment and energy.

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2024

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Cited by 4 publications

References 116 publications

(126 reference statements)

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Visualization Isolation of Electrochemically Active Bacteria by Using a Gelled Electrode-Based Electrochemical Plate

Cao,

Zang,

Xie

et al. 2024

ACS EST Eng.

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Electrochemically active bacteria (EAB) are catalysts of microbial electrogenesis and electrosynthesis, showing great prospects in wastewater treatment and biochemical engineering. However, isolating EAB is difficult, and only a few pure-cultured EAB have been reported. In this study, a novel gelled electrode based on an electrochemical plate is established, which for the first time realizes the selective screening of EAB strains and visible colony formation. A new EAB, Rhodococcus qingshengii C6, is isolated by using the method. R. qingshengii C6 is capable of electricity generation with a wide range of substrate spectra and is capable of reducing common electron acceptors by consuming electricity. The bidirectional extracellular electron transfer mechanism is preliminarily investigated, and exogenous redox mediators play an important role in extracellular electron transfer. This study provides an easy and simple method for the isolation and purification of EAB, contributing to the valuable bacterial resources exploration.

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Visualization Isolation of Electrochemically Active Bacteria by Using a Gelled Electrode-Based Electrochemical Plate

Cao,

Zang,

Xie

et al. 2024

ACS EST Eng.

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Photo-Assisted Enhancement of Uranium Mine Wastewater Purification by a Self-Assembled Shewanella putrefaciens-CdS Biohybrid System

Yang,

Wei,

et al. 2024

ACS Materials Lett.

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Surface-Functionalized PEDOT:PSS Interfaces for Improved Adhesion, Viability, and Extracellular Charge Transfer of Shewanella oneidensis MR-1

Abdullah,

Shakibania,

Patel

et al. 2024

ACS Sustainable Chem. Eng.

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Shewanella oneidensis MR-1 is an electroactive bacterium commonly employed in the design of microbial fuel cells (MFCs) due to its ability to convert organic matter to electricity. Its applicability is limited by low adhesion to the surface of the electrode, which decreases the efficiency of charge transfer and reduces the available power outputs. In this study, we aimed to improve the adhesion, viability, and extracellular charge transfer ability of S. oneidensis on the surface of electrodes modified with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PE-DOT:PSS), which is a conducting polymer frequently used to enhance the performance of MFCs. PEDOT:PSS-coated glass surface was modified with organic moieties, namely, glucose, sucrose, maltose, cellulose, chitosan, poly(vinyl alcohol), poly-Llysine, and laminin. The modified surfaces were then analyzed using Fourier-transform infrared spectroscopy, energy dispersive X-ray spectroscopy, electrochemical impedance spectroscopy, scanning electron microscopy, and fluorescence microscopy, and the results demonstrated an overall improvement in their chemical composition, substantial roughness, and moderate wettability. Biofilm formation was found to be significantly improved on PEDOT:PSS surface coated with glucose, resulting in 54.8 ± 1.2% increase in the amount of biomass. LIVE/DEAD analysis indicated a significantly higher percentage of live bacteria (97.5 ± 1.5%) on the PEDOT:PSS surface coated with glucose when compared to bare PEDOT:PSS (42.1 ± 2.1%). The improved adhesion of S. oneidensis on the glucose-functionalized PEDOT:PSS surface resulted in enhanced charge transfer characteristics, leading to significant decrease in charge transfer resistance at the electrode interface. Our approach shows promise in the further development of efficient renewable energy technology for bioelectricity generation.

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Mechanism and applications of bidirectional extracellular electron transfer of Shewanella

Abstract: Electrochemically active microorganisms (EAMs) play an important role in the fields of environment and energy.

Cited by 4 publications

References 116 publications

Visualization Isolation of Electrochemically Active Bacteria by Using a Gelled Electrode-Based Electrochemical Plate

Visualization Isolation of Electrochemically Active Bacteria by Using a Gelled Electrode-Based Electrochemical Plate

Photo-Assisted Enhancement of Uranium Mine Wastewater Purification by a Self-Assembled Shewanella putrefaciens-CdS Biohybrid System

Surface-Functionalized PEDOT:PSS Interfaces for Improved Adhesion, Viability, and Extracellular Charge Transfer of Shewanella oneidensis MR-1

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