Journal
WATER SCIENCE AND TECHNOLOGY
Volume 49, Issue 4, Pages 183-188Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2004.0257
Keywords
colloidal nanocrystals; degradation of organic pollutants; HPLC-MS; photocatalysis
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In this work, we report on the degradation of methyl-red (2-(4-Dimethylamino-phenylazo)-benzoic acid - C.I. 13020) under UV irradiation in the presence of nanosized ZnO and TiO2. Oxide nanocrystals with controlled size were synthesised by using non-hydrolytic approaches and tested for the photocatalysed degradation. The performances of the immobilised nanoparticles were compared with their commercial counterparts after immobilization onto a solid support. The influence of some experimental conditions, namely pH and dye concentration, were investigated by monitoring the dye decoloration spectrophotometrically. Several intermediate by-products were identified by HPLC-MS, showing that two different mechanisms were operative during the photocatalytic oxidation.
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