| Title | Conductive Magnetite Nanoparticles Enhance the Microbial Electrosynthesis of Acetate from CO2 while Diverting Electrons away from Methanogenesis |
| Abstract | Microbial electrosynthesis (MES) is an emerging technology which exploits microbial cells to convert CO into fuels, and value-added chemicals using electrons supplied by a solid-state cathode. Methane and acetic acid are typically the main CO-reduction products attained in microbial electrosynthesis studies, although the production of other more valuable products has also been reported. So far, however, practical strategies to manipulate and steer the distribution of CO reduction products during microbial electrosynthesis, particularly when mixed microbial cultures are employed as catalysts, are lacking. To specifically address this issue, here we investigated the influence of magnetite nanoparticles (NPs) supplementation (to a final concentration of 300 mg Fe L) on the microbial electrosynthesis process. Results demonstrated, that cells supplemented with magnetite NPs, exhibited a substantially higher yield of acetate production relative to unamended controls (up to 8.5 times higher, during the run with the cathode set at a potential of -700 mV vs. SHE, with a corresponding cathode capture efficiency of 17%) and, correspondingly, a lower yield of methane production (52% in the magnetite-supplemented cell vs. 74% in the unamended control cell). Abiotic experiments indicated that the observed effects derived from magnetite catalyzing the biotic and abiotic hydrogen evolution reaction. |
| Source | Fuel cells (Weinh., Print) 20 (1), pp. 98–106 |
| Keywords | Bioelectrochemical SystemsCarbon Dioxide FixationElectron TransferMagnetiteMicrobial ElectrosynthesisValue Added Chemicals |
| Journal | Fuel cells (Weinh., Print) |
| Editor | Wiley-VCH., Weinheim, Germania |
| Year | 2020 |
| Type | Articolo in rivista |
| DOI | 10.1002/fuce.201900152 |
| Authors | Cruz Viggi, C. ; Colantoni, S.; Falzetti, F.; Bacaloni, A.; Montecchio, D.; Aulenta, F. |
| Text | 420359 2020 10.1002/fuce.201900152 Scopus 2 s2.0 85078021535 Bioelectrochemical Systems Carbon Dioxide Fixation Electron Transfer Magnetite Microbial Electrosynthesis Value Added Chemicals Conductive Magnetite Nanoparticles Enhance the Microbial Electrosynthesis of Acetate from CO2 while Diverting Electrons away from Methanogenesis Cruz Viggi, C. ; Colantoni, S.; Falzetti, F.; Bacaloni, A.; Montecchio, D.; Aulenta, F. Istituto di Ricerca sulle Acque, Italy; Universita degli Studi di Roma La Sapienza Microbial electrosynthesis MES is an emerging technology which exploits microbial cells to convert CO into fuels, and value added chemicals using electrons supplied by a solid state cathode. Methane and acetic acid are typically the main CO reduction products attained in microbial electrosynthesis studies, although the production of other more valuable products has also been reported. So far, however, practical strategies to manipulate and steer the distribution of CO reduction products during microbial electrosynthesis, particularly when mixed microbial cultures are employed as catalysts, are lacking. To specifically address this issue, here we investigated the influence of magnetite nanoparticles NPs supplementation to a final concentration of 300 mg Fe L on the microbial electrosynthesis process. Results demonstrated, that cells supplemented with magnetite NPs, exhibited a substantially higher yield of acetate production relative to unamended controls up to 8.5 times higher, during the run with the cathode set at a potential of 700 mV vs. SHE, with a corresponding cathode capture efficiency of 17% and, correspondingly, a lower yield of methane production 52% in the magnetite supplemented cell vs. 74% in the unamended control cell . Abiotic experiments indicated that the observed effects derived from magnetite catalyzing the biotic and abiotic hydrogen evolution reaction. 20 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85078021535 origin=inward Articolo in rivista Wiley VCH. 1615 6846 Fuel cells Weinh., Print Fuel cells Weinh., Print Fuel cells Weinh., Print federico.aulenta AULENTA FEDERICO daniele.montecchio MONTECCHIO DANIELE carolina.cruzviggi CRUZ VIGGI CAROLINA |
