Free Access
Volume 26, Number 2, March 1998
Couplages CG/SM et CL/SM
Page(s) 83 - 87
Section Original articles
Analusis 26, 83-87 (1998)
DOI: 10.1051/analusis:1998115

Photominéralisation de l'uracile et des 5-halogeno-uraciles sur le dioxyde de titane. Effet du pH et de quelques anions sur la photodégradation de l'uracile

J.L. Lucas Vaz1, A. Boussaoud2, Y. Ait Ichou2 and M. Petit-Ramel1

1  Laboratoire d'Instrumentation et de Chimie Analytique en Solution-LICAS, Université Claude Bernard - Lyon 1, 43 boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
2  Laboratoire de Chimie-Physique, Département de Chimie, Faculté des Sciences d'Agadir, BP. 28/S - 80000, Agadir, Maroc

In oxygenated aqueous solutions, the photocatalytic degradation of uracil and its halogenated homologous is achieved on irradiated titanium dioxide. The kinetics of disappearance and mineralisation in carbon dioxide, ammonium, and nitrate ions are established. In presence of chloride, carbonate, sulphate and nitrate ions, photodisappearance of uracil is inhibited. This can be due to a partial blockage of catalyst active sites by these ions or their reaction with the oxidizing radicals such as HO30 or OH0. It is reported that, at pH lower than 6, disappearance kinetics of this pollutant is reduced.

Key words: Anions / pH / photomineralization / TiO2 / uracil.

© EDP Sciences, Wiley-VCH 1998