Title: Preparation of TiO₂/fly-ash cenospheres photocatalyst and its application of methylene blue degradation combining with the ultrasonic treatment

Authors: Li Chunxiang, Huo Pengwei, Yan Yongsheng, Huang Weihong, Li Songtian

Addresses: School of Chemistry and Chemical Engineering, Jiangsu University, Jiangsu Zhenjiang, 212013, P.R. China. ' School of Chemistry and Chemical Engineering, Jiangsu University, Jiangsu Zhenjiang, 212013, P.R. China. ' School of Chemistry and Chemical Engineering, Jiangsu University, Jiangsu Zhenjiang, 212013, P.R. China. ' School of the Environment, Jiangsu University, Jiangsu Zhenjiang, 212013, P.R. China. ' School of the Environment, Jiangsu University, Jiangsu Zhenjiang, 212013, P.R. China

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.

Keywords: titanium dioxide; fly ash; cenospheres; floating photocatalysts; methylene blue degradation; combining; ultrasonic treatment; photocatalytic activity; photodegradation rate.

DOI: 10.1504/IJMSI.2008.022997

International Journal of Materials and Structural Integrity, 2008 Vol.2 No.4, pp.375 - 382

Published online: 06 Feb 2009 *

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