The aim of this work is the photocatalytic degradation of 5‐fluorouracil from water with titanium dioxide supported on Algerian diatomite. Different methods and amounts of titanium dioxide (30 and 50% weight) are used to synthesize photo‐catalysts which are characterized (X‐ray powder diffraction (XRD), Scanning electron microscopy (SEM), The specific surface area (BET) and X‐ray fluorescence). The degradation efficiency is enhanced by the increasing of TiO2 amount in diatomite matrix. Under our experimental conditions, diatomite supported commercial TiO2 showed the higher performance for the removal of 5‐fluorouracil.

; Tél : +225 48 53 40 09 REMERCIEMENTS Nous remercions les acteurs du projet AMURGE (Appui à la modernisation et à la réforme des universités et grandes écoles de Côte d'Ivoire) pour leur contribution financière à la réalisation de ces travaux. RÉSUMÉLes résidus de médicaments anticancéreux font partie des micropolluants émergents souvent détectés dans les écosystèmes aquatiques. L'objectif de cette étude était de préciser l'influence de la concentration en catalyseur (TiO 2 ) -de l'eau du robinet est vraisemblablement responsable de la diminution de la vitesse constatée, les ions hydrogénocarbonate agissant comme des pièges à radicaux. La variation du pH de 3 à 10 a montré une vitesse optimale pour un pH = 5,8. Egalement, dans l'eau usée, les résultats se sont montrés similaires à ceux obtenus dans l'eau de robinet. © 2017 International Formulae Group. All rights reserved.Mots clés : 5-fluorouracile, UV-A/TiO 2 , eau ultra pure, eau bicarbonatée, eau usée.Photocatalytic degradation of 5-fluorouracil by a UV-A / TiO 2 system: effect of catalyst concentration and pollutant, pH and dilution matrices ABSTRACT Residues of anticancer drugs are among the emerging micropollutants often identified in aquatic ecosystems. The aim of this study was to explain the influence of the concentration of the catalyst (TiO 2 ) and of water matrix composition on the photocatalytic degradation of 5-flurouracil (20 mg.L -1 ). For this purpose, GUETTIA et al. / Int. J. Biol. Chem. Sci. 11(3): 1373-1385, 2017 1374 photocatalytic tests were carried out with suspensions of titanium dioxide at concentrations between 0.1 to 1.0 g.L -1 in ultrapure water and tap water (water with high calcium hardness: with a hydrotimetric parameters > 35° F). The results showed that more than 80% after 120 min of irradiation (UV-A) in ultra-pure at concentrations of 0.1 g L -1 to 1 g L -1 of TiO 2 . However, this rate is 33% and 75% for these same concentrations in tap water matrices. The high concentration of bicarbonate ions in tap water (HCO 3 -) is probably responsible for the decrease in the observed velocity, as the bicarbonate ions act as radical traps. The results in the wastewater matrice are same with those obtained in the tap water. The pH variation from 3 to 10 showed the optimum rate at pH 5.8.

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