Quorum sensing signals improve the power performance and chlortetracycline degradation efficiency of mixed-culture electroactive biofilms

Enhancing extracellular electron transfer through selective enrichment of Geobacter with Fe@CN-modified carbon-based anode in microbial fuel cells

“…Apparently, the value of charge transfer resistance (Rct) in MFC-Fe-CK (29.59 Ω) and MFC-Fe@CN (26.54 Ω) were greatly lower than that of in MFC-CP (36.24 Ω), suggesting that the modi ed anode decreased Rct. As discussed in our recent report, lower Rct could result in a faster extracellular electron transfer rate (Cheng et al 2022). These results implied that Fe@CN modi ed anodes in MFC-Fe-CK and MFC-Fe@CN possessed the higher conductivity, which could be resulted from their larger EASA and more active interfacial interaction between exoelectrogens and electrode.…”

“…The typical double-chamber MFCs device with 50 mL of each identical volume, separated by a proton exchange membrane (Dupont, USA), was constructed as our previous reports (Cheng et al 2022). The anodes were the control carbon paper electrode or the above prepared Fe@CN electrode.…”

“…Extracellular polymeric substances (EPS) fractions from the EABs were extracted following the previous report (Li et al 2019a). Polysaccharide and protein from the EPS were determined by the sulfuric acid-phenol method and BCA Protein Assay Kit, respectively (Cheng et al 2022).…”

“…c-type cytochromes and humics) were responsible for the heterogeneity of EPS ). Polysaccharides were proved to protect cells against unfavorable environment (Cheng et al 2022, Li et al 2021a). During the colonization and maturation of EABs on anodes, the mixed-culture trended to produce some secretions and further to form EPS to package the bio lm from outer environment.…”

Role of bacterial quorum sensing and quenching mechanism in the efficient operation of microbial electrochemical technologies: A state-of-the-art review

“…BH 4 in the anodic chamber, which resulted in the controlled and active biofilm formation that produced more redox compounds and subsequently led to the increase in power generation [ 84 ]. Furthermore, another investigation by Cheng, Xu [ 99 ] revealed that QS signals positively affect the power output of a MFC, chlortetracycline degradation, and the structure of electroactive biofilms. The MFCs with QS molecules butanoyl homoserine lactone and PQS showed an increment in the power output by 21.57% and 13.73%, respectively, compared to MFC without QS molecules.…”