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                <title xml:lang="en">Photocatalytic degradation of 5-fluorouracil by a UV-A/TiO$_2$ system: effect of catalyst concentration and pollutant, pH and dilution matrices</title>
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                <term xml:lang="en">ultra-pure water</term>
                <term xml:lang="en">drinking water</term>
                <term xml:lang="en">treated wastewater</term>
                <term xml:lang="en">5-fluorouracil</term>
                <term xml:lang="fr">5-fluorouracile</term>
                <term xml:lang="fr">UV-A/TiO$_2$</term>
                <term xml:lang="fr">eau ultra pure</term>
                <term xml:lang="fr">eau bicarbonatée</term>
                <term xml:lang="fr">eau usée</term>
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              <p>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,   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 &amp;gt; 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 (HCO3-) 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.</p>
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              <p>Les 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$_2$) et de la nature des matrices d’eaux de dilution sur la dégradation photocatalytique du 5- fluorouracile (20 mg.L$^{-1}$). Pour cela, des expériences de photocatalyse ont été effectuées avec des suspensions de TiO$_2$ à des concentrations comprises entre 0,1 ; 0,5; 1,0 g.L$^{-1}$ dans des matrices d’eau ultra pure et d’eau de robinet. Les résultats ont montré que plus de 80% d’abattement sont obtenus après 200 min d’irradiation (UVA) dans les matrices d’eau ultra pure pour des concentrations de 0,1 g.L$^{-1}$ à 1 g.L$^{-1}$ de TiO$_2$. Par contre, ce taux d’abattement est de 33% et 75% pour ces mêmes concentrations dans les matrices d’eau de robinet. La forte concentration en ions HCO$_3^-$ de l’eau du robinet est vraisemblablement responsable de la diminution de la vitesse constatée, les ions hydroénocarbonate 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.</p>
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