期刊名称：Journal of Environmental Science and Technology
印刷版ISSN：1994-7887
电子版ISSN：2077-2181
出版年度：2009
卷号：2
期号：1
页码：31-39
DOI：10.3923/jest.2009.31.39
出版社：Asian Network for Scientific Information
摘要：TiO2-MoO3 was first used as catalyst to oxidize propylene to acetone. The by-products of this reaction were acetic acid, acetaldehyde and carbon dioxide. The decolouration performances of TiO2 and TiO2-MoO3 for the oxidation of azobenzene in aqueous suspensions irradiated with UV light at 365 nm were studied at pH 3 and 10. At pH 3 complete decolouration of azobenzene dye was obtained after 30 min of irradiation in the presence of TiO2-MoO3 whereas in the presence of TiO2 the time of complete decolouration was 55 min. Subsequent study using TiO2-MoO3 as photocatalystwas the study of the kinetic rate constants of azo and triphenylmethane dyes decolouration. The results were as followed: 0.4535, 0.6832, 0.8512 and 0.9946 m for methyl green, fast green, crystal violet, malachite green respectively at the same concentration of 0.05 mM. The kinetic rate constants for azo dyes were: azobenzene 0.2909 m (C0 = 0.032 mM), methyl orange 0.5497 min-1 (C0 = 0.04 mM) and p-methyl 0.8168 m (C0 = 0.1 mM). These results showed that using TiO2-MoO3 as photocatalyst the decolouration was rapid and total after irradiation time of 30 min whatever the azo or triphenylmethane dyes.
