Design of an electro-Fenton system with a novel sandwich film cathode for wastewater treatment.
In this study, we demonstrate an electro-Fenton (E-Fenton) system constructed with a novel sandwich film cathode (SFC). For the fabrication of SFC, Fe(2+)-chitosan (Fe-CHI) was first deposited on foam nickel (Fe-CHI/Ni). Then two pieces of Fe-CHI/Ni was used to fasten one piece of activated carbon fiber (ACF) to obtain a Fe-CHI/Ni|ACF|Fe-CHI/Ni sandwich film cathode. We interestingly found that this SFC based E-Fenton system could effectively degrade rodamine B with in situ generating both hydrogen peroxide and iron ions. Its degradation efficiency was significantly higher than those of the E-Fenton systems constructed with composite cathodes of carbon nanotubes with Fe@Fe(2)O(3) core-shell nanowires or Cu(2)O nanocubes reported in our previous studies. Hydrogen peroxide electrogenerated through the reduction of O(2) adsorbed on the sandwich film cathode and the iron ions produced by the leakage from Fe(2+)-chitosan film during the E-Fenton reaction were, respectively, monitored, providing clues to understand the high efficiency of this novel SFC based E-Fenton system. More importantly, this low-cost sandwich film cathode was very stable and could be reused without catalytic activity decrease, suggesting its potential application in the wastewater treatment.
Fan
Yan
Y
Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
Ai
Zhihui
Z
Zhang
Lizhi
L
D048271:Chitosan; D055664:Electrochemical Techniques; D004566:Electrodes / Q000592:standards*; D006861:Hydrogen Peroxide / Q000737:chemistry; D007220:Industrial Waste / Q000517:prevention & control; D007501:Iron; D009532:Nickel; D012235:Rhodamines / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D007220:Industrial Waste; D012235:Rhodamines; D014874:Water Pollutants, Chemical; D009532:Nickel; D048271:Chitosan; D006861:Hydrogen Peroxide; D007501:Iron; C029773:rhodamine B