Accelerated azo dye removal by biocathode formation in single-chamber biocatalyzed electrolysis systems.
Biocatalyzed electrolysis systems (BES) have been the topic of a great deal of research. However, the biocathodes formed in single-chamber BES without extra inocula have not previously been researched. Along with the formation of biocathodes, the polarization current increased to 1.76 mA from 0.35 mA of abio-cathodes at -1.2 V (vs. SCE). Electrochemical impedance spectroscopy (EIS) results also indicated that the charge transfer resistance (Rct) was decreased to 148.9 Ω, less than 1978 Ω of the abio-cathodes cleared. The performance of the biocathodes was tested for azo dye decolorization, and the dye removal efficiency was 13.3±3.2% higher than abio-cathodes with a 0.5 V direct current (DC) power supply. These aspects demonstrate that biocathode accelerates the rate of electrode reaction in BES and comparing with noble metal catalysts, biocathodes have low toxicity or non-toxic and reproducible properties, which can be widely applied in bioelectrochemical field in the future.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, PR China.
You-Zhao
YZ
Wang
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, PR China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China. Electronic address: waj0578@hit.edu.cn.
Ai-Jie
AJ
Wang
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
Wen-Zong
WZ
Liu
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, PR China.
De-Yong
DY
Kong
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, PR China.
Wen-Bo
WB
Tan
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, PR China.
Chong
C
Liu
D000580:Amido Black / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry*; D001674:Bioelectric Energy Sources; D018441:Biofilms; D019149:Bioreactors; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D058266:Dielectric Spectroscopy / Q000379:methods*; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D004572:Electrolysis; D004583:Electrons; D013997:Time Factors
D001391:Azo Compounds; D004396:Coloring Agents; D000580:Amido Black
Azo dye removal; Biocatalyzed electrolysis system; Biocathode