Comparison analysis on simultaneous decolorization of Congo red and electricity generation in microbial fuel cell (MFC) with l-threonine-/conductive polymer-modified anodes

• Published in: Environmental science and pollution research international Vol. 28; no. 4; pp. 4262 - 4275
• Main Authors: Li, Chao, Luo, Miaomiao, Zhou, Shihua, He, Hanyue, Cao, Jiashun, Luo, Jingyang
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2021; Springer Nature B.V
• Subjects: Aniline; Anodes; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Biochemical fuel cells; Bioelectric Energy Sources; Conducting polymers; Congo Red; Contact angle; Current density; Decoloring; Decolorization; Dyes; Earth and Environmental Science; Ecotoxicology; Electric contacts; Electricity; Electricity generation; Electrochemistry; Electrodes; Environment; Environmental Chemistry; Environmental Health; Environmental science; Family Characteristics; Fuel cells; Fuel technology; Functional groups; Microorganisms; Next-generation sequencing; Polymers; Research Article; Sequence analysis; Threonine; Waste Water Technology; Water Management; Water Pollution Control; Wettability; Microbial fuel cells (MFC); Conductive polymers; Biofilms; Azo dyes; threonine; L-threonine
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-020-10130-6

l
-Threonine and three kinds of conductive polymers were applied for anode modification in microbial fuel cells (MFCs) for decolorization of Congo red with simultaneous electricity generation. The description of modified anodes with FTIR, surface contact angle, and CV analysis showed that the anode surface was successfully grafted with functional groups, with improving wettability, as well as the increasing specific surface area and electrochemical activity. For
l
-threonine modification, the highest decolorization rate of 97% of the MFC, and meanwhile, the maximum current density of 155.8 mA/m
2
, was obtained at the modified concentration of 400 mg/L. For conductive polymer modifications, the poly (aniline-1,8-diaminonaphthalene) (short for PANDAN) owned the highest performance, with the current density 185 mA/m
2
, and the decolorization rate was 97%. Compared with
l
-threonine, the modifications by conductive polymers were more suitable for MFC decolorization due to their functional groups and unique conductivity. In addition, high-throughput sequencing analysis was conducted for the conductive polymers modified anodes to reveal their bioelectrochemical mechanisms.