External resistance as a potential tool for influencing azo dye reductive decolourisation kinetics in microbial fuel cells

Removal of 17β-estrodial in a bio-electro-Fenton system: contribution of oxidation and generation of hydroxyl radicals with the Fenton reaction and carbon felt cathode

“…28,29 To reveal how external resistance affects E2 removal, the BEF system was operated under different external resistance, i.e. This is consistent with the study of Fernando et al 30 who reported that the reductive decolourisation kinetic constants were higher for all three azo dyes with a moderate external resistance (close to the internal resistance of the MFC systems) than those with a low (very high current densities) or high external resistance (very low current densities). 22 This cathode was prepared with 0.270 g FeCl 3 $6H 2 O and 2.25 g NaBH 4 following the procedures described in Zhuang et al, 14 which resulted in 5.15 AE 0.042 mg iron on the cathode.…”

“…50, 150 (close to the internal resistance of the system), 500 and 1000 U, with the Fe@Fe 2 O 3 /NCF-D cathode as shown in Table 1 which was exactly the one employed in our previous study. 30 The microbial diversity was observed to be enhanced at moderate external resistances, this may result in the optimal color removal and power performance. The results were illustrated in Fig.…”

“…22 This cathode was prepared with 0.270 g FeCl 3 $6H 2 O and 2.25 g NaBH 4 following the procedures described in Zhuang et al, 14 which resulted in 5.15 AE 0.042 mg iron on the cathode. 30 With the maximum power density, the highest external electron transfer efficiency would be achieved and therefore, may account for the best pollutant removal rate. 2.…”

Analysis of electrode microbial communities in an up-flow bioelectrochemical system treating azo dye wastewater

“…The relative abundances of Klebsiella among four samples fluctuated in a narrow range between 2.79 to 3.98%. Klebsiella is a typical fermentative growth genus and has been proved producing current without a mediator [41][42][43]. Lactococcus presented function in azo dye decolorization [44], nitro-compound biotransformation [45] and anodic electron transfer [46].…”

A comprehensive impedance journey to continuous microbial fuel cells

“…Because of this view, Lyon et al established that changing R ext does not improve MFC performance [17]. Nonetheless, contrary to these findings, other authors have found that the magnitude of the external resistance is key for a sustainable power output [19]. More recently, Eustace et al have highlighted the importance of the external resistance on the kinetic rates of microbial electrocatalysis [20].…”