Photocatalytic degradation of commercial azo dyes

Seven azo dyes were photocatalytically degraded in TiO 2 suspension. Their degradation rates were compared with disappearance and TOC elimination rates. It was demonstrated that diazo dye is less degradable than monoazo and the order of photocatalytic degradation rates was in approximate agreement w...

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Bibliographic Details
Published in:Water research (Oxford) 2000, Vol.34 (1), p.327-333
Main Authors: Tanaka, Keiichi, Padermpole, Kanjana, Hisanaga, Teruaki
Format: Article
Language:English
Subjects:
Applied sciences
azo dye
Exact sciences and technology
Industrial wastewaters
intermediate products
organic acid
Pollution
titanium dioxide
Wastewaters
Water treatment and pollution
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Summary:Seven azo dyes were photocatalytically degraded in TiO 2 suspension. Their degradation rates were compared with disappearance and TOC elimination rates. It was demonstrated that diazo dye is less degradable than monoazo and the order of photocatalytic degradation rates was in approximate agreement with that of ozonation rates cited from literature. Major intermediates identified are aromatic amine, phenolic compounds and several organic acids. It was indicated from this study that in the photocatalytic degradation of azo dye the disappearance proceeds through both oxidation and reduction, whereas TOC is eliminated predominantly by oxidation.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(99)00093-7