Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 25, Issue 3, Pages 560-571Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.5935/0103-5053.20140032
Keywords
Pseudomonas aeruginosa; Chlorella vulgaris; microbial fuel cells; bioelectrodes; glycerol biotransformation; carbon dioxide capture; electron shuttles
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Funding
- Brazilian Ministry of Science and Technology (MCTI) [0008.1.06/11, 474997/2012-0]
- Brazilian Research Council (CNPq)
- Foundation for Science and Technology Support from the State of Pernambuco (FACEPE), Brazil
- Catholic University of Pernambuco (UNICAP)
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Power generation at bioanodes of Pseudomonas aeruginosa for glycerol biotransformation was coupled to the carbon dioxide capture in biocathodes of Chlorella vulgaris in hybrid photosynthetic biofuel cells (HPSBC). Biochemical parameters such as microbial growth, substrate consumption, production of bacterial pigments and CO2 capture were studied. Also electrochemical parameters of maxima current densities (Id(max)), power output (Pd-max) and coulombic efficiencies (C-E) were studied. Initially, both systems were evaluated in separate against the corresponding Fe3+vertical bar Fe2+ redox pair. In bacterial systems, important results in terms of Id(max) of 42 +/- 2.1 mu A cm(-2), C-E of 48 +/- 2.4% and Pd-max of 350 +/- 17.5 mW cm(-2) were achieved. Likewise, for isolated algal cathode systems, Id(max) of 93 +/- 4.65 mu A cm(-2), C-E of 56 +/- 2.8% and Pd-max of 3.2 +/- 0.16 mW cm(-2), were achieved. In contrast, when both systems were coupled, a lower Id(max) of 48.5 +/- 2.42 mu A cm(-2) was observed. Finally, bioelectrochemical conditions were improved based on substrate consumption, electrogenic products, cation transport and mediated electron transfer systems. Thus, higher average values for Id(max) of 80 +/- 4.0 mu A cm(-2), C-E of 71.5 +/- 3.57% and Pd-max of 650 +/- 32.5 mW cm(-2) were obtained.
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