Dual-frequency (20/40 kHz) ultrasonic assisted photocatalysis for degradation of methylene blue effluent: synergistic effect and kinetic study.
Dual-frequency ultrasonic assisted photocatalysis (DUAP) was proposed to enhance the degradation efficiency of methylene blue (MB) solution. The influence of operational parameters, i.e., irradiation time, ultrasonic arrangement, TiO(2) concentration and power density, was studied. The results implied that the rapid degradation of MB solution was achieved in 18 min under DUAP with the dual frequencies of 20/40 kHz. Kinetic investigation of MB degradation for the DUAP process was conducted on the basis of first-order kinetic equation and the synergistic effect was assessed by examination of the apparent rate constant. The effect of ultrasonic arrangement was analyzed by comparison of the pressure amplitude of ultrasonic superposition field. The evolvement of intermediate products and the role of active species during DUAP were distinguished by UV-Vis spectra and the free radical scavenging experiment.
College of Chemistry and Chemical Engineering, Jishou University, Jishou, Hunan 416000, PR China. shfxiong@163.com
Shao Feng
SF
Xiong
Zhou Lan
ZL
Yin
Zhang Fu
ZF
Yuan
Wen Bin
WB
Yan
Wen Yin
WY
Yang
Jin Jian
JJ
Liu
Fan
F
Zhang
D002384:Catalysis; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D055668:Photochemical Processes; D013010:Sonication
D008751:Methylene Blue