Photooxidative degradation of coloured organics in water using supported catalysts. TiO2 on sand

The destructive oxidation of several strongly coloured compounds over titanium dioxide attached to sand, by illumination with long wavelength UV and natural sunlight, was studied. The compounds used included methylene blue, Rhodamine B, methyl orange and salicylic acid. In each case, solute disappea...

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Bibliographic Details
Published in:Water research (Oxford) 1991-10, Vol.25 (10), p.1169-1176
Main Author: MATTHEWS, R. W
Format: Article
Language:English
Subjects:
Applied sciences
Biological and physicochemical phenomena
Exact sciences and technology
Natural water pollution
Pollution
Water treatment and pollution
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Summary:The destructive oxidation of several strongly coloured compounds over titanium dioxide attached to sand, by illumination with long wavelength UV and natural sunlight, was studied. The compounds used included methylene blue, Rhodamine B, methyl orange and salicylic acid. In each case, solute disappearance approximately followed first-order kinetics. Degradation rates depended markedly on flow rates, suggesting a significant mass transfer limitation, though the rates were much greater in the photocatalytic system than using natural sunlight. The scaling-up of the process to provide continuous operation was considered feasible at reasonable cost.
ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(91)90054-T