Preparation of TiO₂/fly-ash cenospheres photocatalyst and its application of methylene blue degradation combining with the ultrasonic treatment
by Li Chunxiang, Huo Pengwei, Yan Yongsheng, Huang Weihong, Li Songtian
International Journal of Materials and Structural Integrity (IJMSI), Vol. 2, No. 4, 2008

Abstract: The floating photocatalyst of TiO₂/fly-ash cenospheres was prepared by sol-gel method and calcined at different temperatures (from 573K to 973K). The photocatalytic activity of TiO₂/fly-ash cenospheres was investigated for photocatalytic degradation of methylene blue under ultrasonic-photocatalysis. It was found that the photocatalytic activity of TiO₂/fly-ash cenospheres photocatalyst was higher when calcined at 773K than the samples calcined at other temperatures. Under the experimental conditions of 0.05g, TiO₂/fly-ash cenospheres, ultrasonic and light irradiation, the photodegradation rate of 5 mg&47;L methylene blue can reach up to 92.09% in ten minutes and near 100% in 30 minutes. In addition, the photodegradation rate of the catalyst used second recycle can reach over 90% in 30 minutes, indicating that it still shows good degradation effect.

Online publication date: Fri, 06-Feb-2009

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