Understanding the role of Fe(III)/Fe(II) couple in mediating reductive transformation of 2-nitrophenol in microbial fuel cells.
The Fe(III)/Fe(II) couple can play a significant role in the abiotic reduction of 2-nitrophenol (2-NP) at the cathode chamber of a microbial fuel cell (MFC). Experimental results demonstrate that Fe(II) addition to the cathode chamber contributes to a significant increase in the reaction rate of 2-NP removal and the power performance of MFC. Observed pseudo first-order rate constants and power densities are heavily dependent on the identity of the Fe(II)-complexing ligands. The Fe(II) complex coordinated with citrate results in the highest rate constant up to 0.12 h(-1) as compared to other organically complexed iron species including Fe(II)-EDTA, Fe(II)-acetate and Fe(II)-oxalate, and iron species uncomplexed with any organic ligands. In addition, the presence of Fe(II)-citrate species leads to a maximum volumetric power density of 1.0 W m(-3), which is the highest value among those obtained with other iron species for the similar MFC system.
Feng
Chunhua
C
School of Environmental Science and Engineering, South China University of Technology, Higher Education Mega Center, Guangzhou 51006, PR China.
Li
Fangbai
F
Sun
Kewen
K
Liu
Yongye
Y
Liu
Liang
L
Yue
Xianjun
X
Tong
Hui
H
D001674:Bioelectric Energy Sources; D004560:Electricity; D004566:Electrodes; D004583:Electrons; D007501:Iron / Q000494:pharmacology*; D007700:Kinetics; D008024:Ligands; D009596:Nitrophenols / Q000378:metabolism*; D010084:Oxidation-Reduction / Q000187:drug effects; D013997:Time Factors
D008024:Ligands; D009596:Nitrophenols; C045573:2-nitrophenol; D007501:Iron