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Sonocatalytic degradation of some dyestuffs and comparison of catalytic activities of nano-sized TiO2, nano-sized ZnO and composite TiO2/ZnO powders under ultrasonic irradiation

Wang, Jun and Jiang, Zhe and Zhang, Liqun and Kang, Pingli and Xie, Yingpeng (2009) Sonocatalytic degradation of some dyestuffs and comparison of catalytic activities of nano-sized TiO2, nano-sized ZnO and composite TiO2/ZnO powders under ultrasonic irradiation. Ultrasonics Sonochemistry , 16 . pp. 225-231.

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Abstract

Here, a novel sonocatalyst, composite TiO2/ZnO powder, was prepared through the combination of nanosized TiO2 and ZnO powders. Because of the appropriate adsorbability to organic pollutants and special crystal interphase between TiO2 and ZnO particles, the composite TiO2/ZnO powder exhibits a high sonocatalytic activity under ultrasonic irradiation during the degradation of acid red B. Especially, the sonocatalytic activity of composite TiO2/ZnO powder with 4:1 molar proportion treated at 500 C for 50 min showed obvious improvement compared with pure nano-sized TiO2 and ZnO powders. When the experimental conditions such as 10 mg/L acid red B concentration, 1.0 g/L catalyst addition amount, pH = 7.0, 20 C system temperature, 100 min ultrasonic time and 50 mL total volume were adopted, the satisfactory degradation ratio and rate were obtained. All experiments indicate that the sonocatalytic method using composite TiO2/ZnO powder may be a more advisable choice for the treatments of non- or lowtransparent organic wastewaters in future.

Item Type:Article
Subjects:Material Science > Nanostructured materials
ID Code:5020
Deposited By:CSMNT
Deposited On:20 Apr 2009 09:15
Last Modified:20 Apr 2009 09:15

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