[Degradation mechanism of acid red B by cathodic oxidation].
Acid red B (ARB) solution with pH = 3 was electrolyzed in a two-chamber cell using Pt/C gas diffusion electrode (GDE) as cathode. The color and COD removal ratio in cathode chamber were 94.2% and 66.8% respectively; and the color and COD removal ratio in anode chamber were 73.3% and 56.6% respectively, which indicated that O2 can be reduced to H2O2 and x OH in the cathode chamber, then ARB was degraded. Through IR and GC-MS analysis for the intermediates of ARB in the cathode chamber, 20 intermediates have been detected, including 14 esters, 3 acids and 3 compounds with -NO2 or N-OH groups and the probable degradation pathway of ARB in the cathode chamber was given.
Lei
Yang-Ming
YM
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China.
Shen
Zhe-Min
ZM
Yu
Qing-Chun
QC
Hu
Xiao-Fang
XF
Zhu
Song-He
SH
Wang
Wen-Hua
WH
D004396:Coloring Agents / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D010084:Oxidation-Reduction; D012235:Rhodamines / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
D004396:Coloring Agents; D012235:Rhodamines; C022027:lissamine rhodamine B