Synergetic interaction of magnetic field and loaded magnetite for enhanced acetate production in biocathode of microbial electrosynthesis system. (8th February 2021)

• Record Type: Journal Article
• Authors: Hou, Xia; Huang, Liping; Zhou, Peng
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 10(2021)
• Page Start: 7183
• Page End: 7194
• Publication Date: 2021-02-08
• Subjects: Microbial electrosynthesis system -- Biocathode -- Inorganic carbon reduction -- Magnetic field -- Fe3O4 -- c-type cytochromes; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.11.266
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Magnetic field (MF, 200 mT) and Fe3 O4 (26 g/m 2 ) are simultaneously employed to enhance acetate production from bicarbonate reduction in Serratia marcescens catalyzed cathode of microbial electrosynthesis system (MES), reaching 8.5 mM at an operational time of 9 d, higher than the controls by 1.7-time (Fe3 O4 only), 1.8-fold (MF only), and 2.3-time (neither Fe3 O4 nor MF). This confirms synergetic interaction of the MF and Fe3 O4 for enhanced acetate production in the MES. The presence of MF and Fe3 O4 induces the S. marcescens physiologically releasing more extracellular polymeric substances with a compositional diversity and containing more c -type cytochromes for facilitating extracellular electron transfer for efficient acetate production. Moreover, the favorable MF for less shedding (approximate 40%) of Fe3 O4 from the biocathode, also contributes to the efficient MES. This study provides a feasible strategy of the Fe3 O4 and MF for efficient acetate production from bicarbonate reduction in the MES. Graphical abstract: Image 1 Highlights: Synergetic interaction of magnetic field and loaded Fe3 O4 is observed in MES. Magnetic field favors for less shedding of loaded Fe3 O4 from biocathode. Magnetic field and Fe3 O4 regulate electrotrophic physiological activity. Electrotroph releases EPS with a compositional diversity. EPS contain c -type cytochromes for facilitating extracellular electron transfer.