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| Titel: |
TiO2-MoO3 as Photocatalyst for Azo and Triphenylmethane Dyes Decolouration |
| Auteur: |
J.B. Tchatchueng B.B. Loura J. Atchana R. Kamga |
| Verschenen in: |
Journal of environmental science and technology |
| Paginering: | Jaargang 2 (2009) nr. 1 pagina's 31-39 |
| Jaar: |
2009 |
| Inhoud: |
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 photocatalyst was 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. |
| Uitgever: |
Asian Network for Scientific Information (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 11 gevonden artikelen
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