Electron Transfer by Desulfobulbus propionicus to Fe(III) and Graphite Electrodes

ABSTRACT Desulfobulbus propionicus was able to grow with Fe(III), the humic acids analog anthraquinone-2,6-disulfonate (AQDS), or a graphite electrode as an electron acceptor. These results provide an explanation for the enrichment of Desulfobulbaceae species on the surface of electrodes harvesting electricity from anaerobic marine sediments and further expand the diversity of microorganisms known to have the ability to use both sulfate and Fe(III) as an electron acceptor.

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Direct electrochemical deposition of polyaniline nanowire array on reduced graphene oxide modified graphite electrode for direct electron transfer biocatalysis

RSC Advances ◽

10.1039/c5ra16365j ◽

2015 ◽

Vol 5 (113) ◽

pp. 93209-93214 ◽

Cited By ~ 8

Author(s):

Lin Xia ◽

Jianfei Xia ◽

Zonghua Wang

Keyword(s):

Electron Transfer ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Electrochemical Deposition ◽

Graphite Electrode ◽

Direct Electron Transfer ◽

Nanowire Array ◽

Graphite Electrodes ◽

Reduced Graphene

Direct electron transfer biocatalysis was achieved via electrochemically produced ordered PANI nanowire array on reduced graphene oxide modified graphite electrodes.

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Third-generation oxygen amperometric biosensor based on Trametes hirsuta laccase covalently bound to graphite electrode

Chemical Papers ◽

10.2478/s11696-014-0595-x ◽

2015 ◽

Vol 69 (1) ◽

Cited By ~ 7

Author(s):

Cristina Gutierrez-Sanchez ◽

Sergey Shleev ◽

Antonio L. De Lacey ◽

Marcos Pita

Keyword(s):

Electron Transfer ◽

Graphite Electrode ◽

Direct Electron Transfer ◽

Low Density ◽

Third Generation ◽

Time Analysis ◽

Trametes Hirsuta ◽

Graphite Electrodes ◽

Real Time Analysis ◽

Density Graphite

AbstractThe response of low-density graphite electrodes hosting Trametes hirsuta laccase in a direct electron transfer regime is presented for real-time analysis of O

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Graphite Electrode as a Sole Electron Donor for Reductive Dechlorination of Tetrachlorethene by Geobacter lovleyi

Applied and Environmental Microbiology ◽

10.1128/aem.00961-08 ◽

2008 ◽

Vol 74 (19) ◽

pp. 5943-5947 ◽

Cited By ~ 175

Author(s):

Sarah M. Strycharz ◽

Trevor L. Woodard ◽

Jessica P. Johnson ◽

Kelly P. Nevin ◽

Robert A. Sanford ◽

...

Keyword(s):

Electron Donor ◽

Electron Acceptor ◽

Reductive Dechlorination ◽

Graphite Electrode ◽

Geobacter Sulfurreducens ◽

Standard Hydrogen Electrode ◽

Hydrogen Electrode ◽

Graphite Electrodes ◽

Chlorinated Contaminants ◽

Donor Cells

ABSTRACT The possibility that graphite electrodes can serve as the direct electron donor for microbially catalyzed reductive dechlorination was investigated with Geobacter lovleyi. In an initial evaluation of whether G. lovleyi could interact electronically with graphite electrodes, cells were provided with acetate as the electron donor and an electrode as the sole electron acceptor. Current was produced at levels that were ca. 10-fold lower than those previously reported for Geobacter sulfurreducens under similar conditions, and G. lovleyi anode biofilms were correspondingly thinner. When an electrode poised at −300 mV (versus a standard hydrogen electrode) was provided as the electron donor, G. lovleyi effectively reduced fumarate to succinate. The stoichiometry of electrons consumed to succinate produced was 2:1, the ratio expected if the electrode served as the sole electron donor for fumarate reduction. G. lovleyi effectively reduced tetrachloroethene (PCE) to cis-dichloroethene with a poised electrode as the sole electron donor at rates comparable to those obtained when acetate serves as the electron donor. Cells were less abundant on the electrodes when the electrodes served as an electron donor than when they served as an electron acceptor. PCE was not reduced in controls without cells or when the current supply to cells was interrupted. These results demonstrate that G. lovleyi can use a poised electrode as a direct electron donor for reductive dechlorination of PCE. The ability to colocalize dechlorinating microorganisms with electrodes has several potential advantages for bioremediation of subsurface chlorinated contaminants, especially in source zones where electron donor delivery is challenging and often limits dechlorination.

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Molecular Engineering for High-Performance Fullerene Broadband Photodetector

Nanoscale Advances ◽

10.1039/d0na00981d ◽

2021 ◽

Author(s):

Mingming Su ◽

Yajing Hu ◽

Ao Yu ◽

Zhiyao Peng ◽

Wangtao Long ◽

...

Keyword(s):

Electron Transfer ◽

Low Temperature ◽

Electron Acceptor ◽

Photoinduced Electron Transfer ◽

High Performance ◽

Organic Molecules ◽

Low Cost ◽

Molecular Engineering ◽

Temperature Requirement ◽

High Flexibility

Broadband photodetectors fabricated with organic molecules have the advantages of low cost, high flexibility, easy processing and low-temperature requirement. Fullerene molecules, due to the electron acceptor and photoinduced electron transfer...

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Insight to Microbial Fe(III) Reduction Mediated by Redox-Active Humic Acids with Varied Redox Potentials

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18136807 ◽

2021 ◽

Vol 18 (13) ◽

pp. 6807

Author(s):

Jingtao Duan ◽

Zhiyuan Xu ◽

Zhen Yang ◽

Jie Jiang

Keyword(s):

Molecular Weight ◽

Electron Transfer ◽

Humic Acids ◽

Weight Fraction ◽

Electrochemical Analysis ◽

Microbial Reduction ◽

Redox Potentials ◽

Groundwater Environment ◽

Redox Active ◽

Different Molecular Weight

Redox-active humic acids (HA) are ubiquitous in terrestrial and aquatic systems and are involved in numerous electron transfer reactions affecting biogeochemical processes and fates of pollutants in soil environments. Redox-active contaminants are trapped in soil micropores (<2 nm) that have limited access to microbes and HA. Therefore, the contaminants whose molecular structure and properties are not damaged accumulate in the soil micropores and become potential pollution sources. Electron transfer capacities (ETC) of HA reflecting redox activities of low molecular weight fraction (LMWF, <2.5) HA can be detected by an electrochemical method, which is related to redox potentials (Eh) in soil and aquatic environments. Nevertheless, electron accepting capacities (EAC) and electron donating capacities (EDC) of these LMWF HA at different Eh are still unknown. EDC and EAC of different molecular weight HA at different Eh were analyzed using electrochemical methods. EAC of LMWF at −0.59 V was 12 times higher than that at −0.49 V, while EAC increased to 2.6 times when the Eh decreased from −0.59 V to −0.69 V. Afterward, LMWF can act as a shuttle to stimulate microbial Fe(III) reduction processes in microbial reduction experiments. Additionally, EAC by electrochemical analysis at a range of −0.49–−0.59 V was comparable to total calculated ETC of different molecular weight fractions of HA by microbial reduction. Therefore, it is indicated that redox-active functional groups that can be reduced at Eh range of −0.49–−0.59 are available to microbial reduction. This finding contributes to a novel perspective in the protection and remediation of the groundwater environment in the biogeochemistry process.

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Selective chemochromic and chemically-induced photochromic response of a metal–organic framework

Chemical Communications ◽

10.1039/d0cc01627f ◽

2020 ◽

Vol 56 (44) ◽

pp. 5929-5932 ◽

Cited By ~ 8

Author(s):

Peng Li ◽

Qi Sui ◽

Meng-Yue Guo ◽

Shuai-Liang Yang ◽

Ran Bu ◽

...

Keyword(s):

Electron Transfer ◽

Electron Acceptor ◽

Photoinduced Electron Transfer ◽

Color Change ◽

Metal Organic Framework ◽

Confined Space ◽

Chemically Induced ◽

Metal Organic ◽

Organic Framework

The MOF provides unique confined space furnished with electron acceptor sites, and exposure to amines/alcohols causes specific and size-selective direct/UV-assisted color change owing to spontaneous/photoinduced electron transfer.

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