Sonophotoelectrocatalytic degradation of azo dye on TiO2 nanotube electrode.
The degradation of azo dye, methyl orange (MeO) in aqueous solution with sonophotoelectrocatalytic process was investigated. The TiO(2) nanotubes were used as electrode in photoelectrocatalytic (PEC), sonophotoelectrocatalytic (SPEC) processes or as photocatalyst in photocatalytic (PC), sonophotocatalytic (SPC) processes, respectively. Experimental results showed that the hybrid processes could efficiently enhance the degradation efficiency of MeO, and followed pseudo-first-order kinetics. At the optimized experimental conditions, the rate constants of decolorization of MeO were 0.0732 min(-1) for SPEC process; 0.0523 min(-1) for PEC process, 0.0073 min(-1) for SPC process and 0.0035 min(-1) for PC process. The rate constants obviously indicated that there existed synergistic effect in the ultrasonic, electro-assisted and photocatalytic processes.
Zhang
Zhonghai
Z
Department of Chemistry, East China Normal University, Shanghai 200062, PR China.
Yuan
Yuan
Y
Department of Chemistry, East China Normal University, Shanghai 200062, PR China.
Liang
Linhong
L
Department of Chemistry, East China Normal University, Shanghai 200062, PR China.
Fang
Yanju
Y
Department of Chemistry, East China Normal University, Shanghai 200062, PR China.
Cheng
Yuxiao
Y
Department of Chemistry, East China Normal University, Shanghai 200062, PR China.
Ding
Hongchun
H
Department of Chemistry, East China Normal University, Shanghai 200062, PR China.
Shi
Guoyue
G
Department of Chemistry, East China Normal University, Shanghai 200062, PR China.
Jin
Litong
L
Department of Chemistry, East China Normal University, Shanghai 200062, PR China. Electronic address: ltjin@chem.ecnu.edu.cn.
D000465:Algorithms; D001391:Azo Compounds / Q000737:chemistry* / Q000528:radiation effects*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry / Q000528:radiation effects; D004563:Electrochemistry; D004566:Electrodes; D007202:Indicators and Reagents; D008855:Microscopy, Electron, Scanning; D043942:Nanotubes / Q000737:chemistry* / Q000528:radiation effects*; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects*; D014465:Ultrasonics; D014466:Ultraviolet Rays
D001391:Azo Compounds; D004396:Coloring Agents; D007202:Indicators and Reagents; C009495:titanium dioxide; C100258:methyl orange; D014025:Titanium