Journal
CATALYSIS LETTERS
Volume 146, Issue 12, Pages 2585-2595Publisher
SPRINGER
DOI: 10.1007/s10562-016-1894-3
Keywords
Nitrate; Electrochemical reduction; Dual-chamber cell; Ti/TiO2 nanotube array anode; Fe
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Funding
- Jiangsu Innovation Program for Graduate Education [KYLX150305]
- Fundamental Research Funds for the Central Universities
- Foundation of Graduate Innovation Center in NUAA [KFJJ20160611]
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Electrochemical reduction of nitrate using Fe cathode and Ti/TiO2 nanotube array anode in dual-chamber cell was investigated. The performance of different cathodes for nitrate removal were in the order of Fe > Al > Cu > Ni. The nitrate removal in dual-chamber cell (99.8%) was much higher than that in single-chamber cell (84.3%) with Fe cathode in 2.5 h. In dual-chamber cell, the highest nitrate removal was obtained at the current density of 15 mA/cm(2). The nitrate reduction followed first-order kinetics. With increasing initial nitrate concentration, the reduction rate constant slightly decreased from 2.2 h(-1) (100.0 mg/L) to 0.9 h(-1) (1000.0 mg/L), of which a remarkable nitrate removal of 88.3% could still be achieved with 1000.0 mg/L nitrate. In the presence of 0.5 g/L NaCl, simultaneous reduction of nitrate and oxidation of by-products of ammonia and nitrite were achieved in dual-chamber cell with Fe cathode, of which the nitrate removal rate was 94.3% and no by-products were detected in the solution. [GRAPHICS] .
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