Abstract
BackgroundAlthough simultaneous dye decolorization and bioelectricity generation (SDD&BG) in microbial fuel cells (MFCs) were mentioned in literature, the unpredictable electron-transferring phenomena (ETP) taken place in the cathodic chamber (CC) and anodic chamber (AC) were still remained open to be explored for system optimization. MethodsDouble chamber (DC)-MFC were constructed as descried in Guo et al. (2019) for comparative assessment. CC contained 200 mL cultured broth at 0.5x LB broth (OD600∼1.6 ± 0.1) and different concentrations of K3Fe(CN)6 at 0, 1000, 3000, 5000 mg L− 1 were specifically provided in 0.01 M phosphate buffered saline. For comparative evaluation, the experimental design of case-control MFC study was implemented via three modes of operation (i.e., dye decolorization (DD) alone, bioelectricity generation (BG) alone and simultaneous DD&BG) in DC-MFC to disclose efficiencies of ETP. Significant findingsThis novel study quantitatively deciphered ETP in CC and AC to optimize not only bioelectric generation, but also dye decolorization. Supplement of cathode acceptors (e.g., potassium ferricyanide; PF) in the CC could efficiently augment the overall stoichiometric ratio of electron transfer ϕ value (ca. 3.34∼3.46 fold increase), considerably stimulating the performance of reductive decolorization. Evidently, DC-MFC seemed to be more electroactive than single chamber-MFC to maximize ET efficiency for SDD&BG.
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