Journal
ULTRASONICS SONOCHEMISTRY
Volume 19, Issue 5, Pages 1027-1032Publisher
ELSEVIER
DOI: 10.1016/j.ultsonch.2012.02.008
Keywords
Sonolysis; Photocatalysis; Sonophotocatalysis; Azo dye; Photocatalytic reactor
Categories
Funding
- Chongqing Science and Technology Committee [CSTC2009AB1048]
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An original ultrasound (US) directly intensified photocatalytic reactor was designed to degrade azo dye pollutant methyl orange (MeO) using Degussa TiO2 as the photocatalyst. The sonolytic, photocatalytic and sonophotocatalytic degradation of MeO in the new reactor and the synergistic effect between sonolysis and photocatalysis were investigated. Effects of operation parameters i.e., US power, TiO2 dosage, liquid circulation velocity and air flow rate on degradation efficiency were investigated and optimized. The results showed that all parameters have optimal values for the sonophotocatalytic degradation of MeO, and the optimum conditions for the new process are US power 600 W, TiO2 dosage 3 g/L, liquid circulation velocity 4.05 x 10(-2) m/s and air flow rate 0.2 L/min. Under the optimum conditions, 91.52% MeO had been degraded within 1 h, and the combination of sonolysis and TiO2 photocatalysis exhibited an obvious synergetic effect. (C) 2012 Elsevier B.V. All rights reserved.
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