title: Synergistic degradation of methyl orange in an ultrasound intensified photocatalytic reactor.
abstract: An original ultrasound (US) directly intensified photocatalytic reactor was designed to degrade azo dye pollutant methyl orange (MeO) using Degussa TiO(2) 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, TiO(2) 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, TiO(2) dosage 3g/L, liquid circulation velocity 4.05×10(-2) m/s and air flow rate 0.2 L/min. Under the optimum conditions, 91.52% MeO had been degraded within 1h, and the combination of sonolysis and TiO(2) photocatalysis exhibited an obvious synergetic effect.
authors.affiliation: Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education), College of Chemistry and Chemical Engineering, Southwest University, Chongqing, PR China.
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Cheng
authors.forename: Xuejun
authors.initials: X
authors.lastname: Quan
authors.forename: Yanqi
authors.initials: Y
authors.lastname: Xiong
authors.forename: Lu
authors.initials: L
authors.lastname: Yang
authors.forename: Yuming
authors.initials: Y
authors.lastname: Huang
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry*; D014465:Ultrasonics
chemical_list: D001391:Azo Compounds; C009495:titanium dioxide; C100258:methyl orange; D014025:Titanium