Decolorization of an azo dye Orange G in microbial fuel cells using Fe(II)-EDTA catalyzed persulfate.
This study constructed a microbial fuel cell (MFC) using Fe(II)-EDTA catalyzed persulfate as the cathode solutions to decolorize Orange G (OG) and harvest electricity simultaneously. Chelated Fe(2+) could activate persulfate to generate sulfate free radicals (SO(4)(-)) which with high oxidation potential (E(0)=2.6 V) can degrade azo dyes. The influence of some important factors such as pH value of cathode solutions, dosages of K(2)S(2)O(8), Fe(2+) and EDTA were investigated in a two-chamber microbial fuel cell. Under an optimal condition, the maximum power density achieved 91.1 mW m(-2), the OG removal rate was 97.4% and the K(2)S(2)O(8) remaining rate was 47.3% after 12 h. The OG degradation by Fe(II)-EDTA catalyzed persulfate was found to follow the second-order kinetic model.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China. cgniu@hotmail.com
Cheng-Gang
CG
Niu
Ying
Y
Wang
Xue-Gang
XG
Zhang
Guang-Ming
GM
Zeng
Da-Wei
DW
Huang
Min
M
Ruan
Xiang-Wei
XW
Li
D001391:Azo Compounds / Q000737:chemistry*; D001673:Biodegradation, Environmental; D001674:Bioelectric Energy Sources; D002384:Catalysis; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry*; D004560:Electricity; D004566:Electrodes; D005296:Ferrous Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D017680:Potassium Compounds / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry*
D001391:Azo Compounds; D004396:Coloring Agents; D005296:Ferrous Compounds; D007477:Ions; D017680:Potassium Compounds; D013431:Sulfates; C055526:Fe(II)-EDTA; C008710:Orange G; C009007:potassium persulfate; D004492:Edetic Acid