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Photocatalytic Degradation of Monolinuron and Linuron in An Document généré le 25 sept. 2021 22:28 Revue des sciences de l'eau Journal of Water Science Photocatalytic Degradation of Monolinuron and Linuron in an Aqueous Suspension of Titanium Dioxide Under Simulated Solar Irradiation Dégradation photocatalytique du monolinuron et du linuron dans une suspension aqueuse de dioxide de titanium au contact de lumière solaire simulée Razika Zouaghi, Abdennour Zertal, Bernard David et Sylvie Guittonneau Volume 20, numéro 2, 2007 Résumé de l'article La dégradation photocatalytique de deux herbicides, le monolinuron (MLN) et URI : https://id.erudit.org/iderudit/015810ar le linuron (LN), a été étudiée dans une suspension de TiO au contact de 2 DOI : https://doi.org/10.7202/015810ar lumière solaire simulée. L’objectif de cette étude est de comparer leur photoréactivité et d’évaluer l’influence de différents paramètres tels que la Aller au sommaire du numéro concentration initiale en pesticide, la concentration en catalyseur et le flux photonique sur la cinétique de dégradation du monolinuron. L’étude comparative de la dégradation des deux herbicides a montré que les deux composés présentent une réactivité comparable avec le système TiO /lumière Éditeur(s) 2 simulée. Dans les conditions opératoires de cette étude, la dégradation Université du Québec - INRS-Eau, Terre et Environnement (INRS-ETE) photocatalytique du LN et du MLN suit une cinétique de pseudo ordre 1. La pseudo-constante k est inversement proportionnelle à la concentration obs ISSN initiale en pesticide et peut être décrite par une équation de Langmuir-Hinshelwood. L’étude de l’influence de la concentration en TiO a 2 1718-8598 (numérique) permis de montrer que la cinétique de dégradation du MLN augmente avec la dose de catalyseur, mais un surdosage n’est pas nécessaire pour augmenter Découvrir la revue l’efficacité du procédé. Cette étude a permis également de montrer que la pseudo‑constante d’ordre 1 de dégradation du MLN augmente linéairement avec le flux lumineux jusqu’à 580 W m-2 puis décroît. Dans ces conditions, la Citer cet article recombinaison des électrons trous est favorisée. Enfin, la cinétique de dégradation du MLN en fonction du pH passe par un optimum de pH proche du Zouaghi, R., Zertal, A., David, B. & Guittonneau, S. (2007). Photocatalytic pH de point de charge nulle (pH = 6). Degradation of Monolinuron and Linuron in an Aqueous Suspension of Titanium Dioxide Under Simulated Solar Irradiation. Revue des sciences de l'eau / Journal of Water Science, 20(2), 163–172. https://doi.org/10.7202/015810ar Tous droits réservés © Revue des sciences de l'eau, 2007 Ce document est protégé par la loi sur le droit d’auteur. L’utilisation des services d’Érudit (y compris la reproduction) est assujettie à sa politique d’utilisation que vous pouvez consulter en ligne. https://apropos.erudit.org/fr/usagers/politique-dutilisation/ Cet article est diffusé et préservé par Érudit. Érudit est un consortium interuniversitaire sans but lucratif composé de l’Université de Montréal, l’Université Laval et l’Université du Québec à Montréal. Il a pour mission la promotion et la valorisation de la recherche. https://www.erudit.org/fr/ PHOTOCATALYTIC DEGRADATION OF MONOLINURON AND LINURON IN AN AQUEOUS SUSPENSION OF TITANIUM DIOXIDE UNDER SIMULATED SOLAR IRRADIATION Dégradation photocatalytique du monolinuron et du linuron dans une suspension aqueuse de dioxide de titanium au contact de lumière solaire simulée Razika Zouaghia b, Abdennour Zertala, Bernard Davidb and Sylvie Guittonneaub* aLaboratoire des Sciences et Technologie de l’Environnement, Université de Mentouri, Constantine, Algérie bLaboratoire de Chimie Moléculaire et Environnement, Université de Savoie, Savoie Technolac, 73376 Le Bourget du Lac, France Reçu le 30 octobre 2005, accepté le 18 september 2006 ABSTRACT an electron-hole recombination was favored. Finally, the photocatalytic degradation rate depended on pH, where an optimum was found at a pH value close to the pH of the point The photocatalytic degradation of two phenylurea of zero charge (pH = 6). herbicides, monolinuron (MLN) and linuron (LN), was investigated in an aqueous suspension of TiO2 using simulated solar irradiation. The objective of the study was to compare Keywords: Linuron; Monolinuron; phenyl urea herbicides; their photocatalytic reactivity and to assess the influence of photocatalysis; titanium dioxide. various parameters such as initial pesticide concentration, catalyst concentration and photonic flux on the photocatalytic degradation rate of MLN and LN. A comparative study of the RÉSUMÉ photocatalytic degradation kinetics of both herbicides showed that these two compounds have a comparable reactivity with La dégradation photocatalytique de deux herbicides, le TiO2/simulated sun light. Under the operating conditions of this study, the photocatalytic degradation of MLN and LN monolinuron (MLN) et le linuron (LN), a été étudiée dans une suspension de TiO au contact de lumière solaire simulée. followed pseudo first-order decay kinetics. Theobs k values 2 indicated an inverse dependence on the initial herbicide L’objectif de cette étude est de comparer leur photoréactivité concentration and were fitted to the Langmuir-Hinshelwood et d’évaluer l’influence de différents paramètres tels que equation. Photocatalytic degradation rates increased with la concentration initiale en pesticide, la concentration en catalyseur et le flux photonique sur la cinétique de dégradation TiO2 dosage, but overdoses did not necessarily increase the photocatalytic efficiency. The degradation rate of MLN du monolinuron. L’étude comparative de la dégradation des increased with radiant flux until an optimum at 580 W m-2 deux herbicides a montré que les deux composés présentent une was reached and then decreased. Under these conditions, réactivité comparable avec le système TiO2/lumière simulée. *Auteur pour correspondance : Téléphone: (33)4 79 75 86 06 Télécopieur: (33) 4 79 75 86 74 Courriel : [email protected] [email protected] ISSN : 1718-8598 Revue des Sciences de l’Eau 20(2) (2007) 163-172 164 Photocatalytic degradation Dans les conditions opératoires de cette étude, la dégradation O O photocatalytique du LN et du MLN suit une cinétique de CH3 CH3 Cl NH N Cl NH N pseudo ordre 1. La pseudo-constante kobs est inversement proportionnelle à la concentration initiale en pesticide et peut O O H3C Cl H3C être décrite par une équation de Langmuir-Hinshelwood. (a) (b) L’étude de l’influence de la concentration en TiO2 a permis de montrer que la cinétique de dégradation du MLN Figure 1. Chemical structure of (a) monolinuron (MLN) and augmente avec la dose de catalyseur, mais un surdosage n’est (b) linuron (LN). pas nécessaire pour augmenter l’efficacité du procédé. Cette Formule chimique du (a) monolinuron (MLN) et (b) linuron étude a permis également de montrer que la pseudo-constante (LN). d’ordre 1 de dégradation du MLN augmente linéairement avec le flux lumineux jusqu’à 580 W m-2 puis décroît. Dans ces conditions, la recombinaison des électrons trous est favorisée. moderately soluble in water (s = 735 and 81 mg L-1 at 25°C for Enfin, la cinétique de dégradation du MLN en fonction du MLN and LN respectively) (TOMLIN, 2000). Consequently, pH passe par un optimum de pH proche du pH de point de MLN and LN can give rise to important residues in soil and charge nulle (pH = 6). in water. Mots clés : Linuron; Monolinuron; herbicides phényl urées; The aim of the present work was to study the photocatalytic photocatalyse;oxyde de titane degradation of LN and MLN in presence of TiO2 in aqueous solution using simulated solar irradiation. The effect of various parameters, such as herbicide concentration, photonic flux, 1. INTRODUCTION mass of catalyst and pH on the decay of MLN, was investigated. These herbicides were the subject of direct photolysis butthere are no published papers concerning their photocatalytic In the last few decades, considerable attention has been transformation. given to the toxic and persistent pollutants coming from industrial and agricultural human activities. The application of photochemistry to environmental remediation and treatment has also been an active area of research and heterogeneous 2. MATERIALS AND METHODS photocatalysis using UV/TiO2 system has often been proposed to eliminate these pollutants (BAHNEMANN et al., 1994; CUNNINGHAM and SRIJARANAI, 1994; HERRMANN, 2.1 Reactants 1999; MARINAS et al., 2001; OLLIS and EL-EKABI, 1993). Titanium dioxide is widely used as photocatalyst All reagents were of the purest grade commercially available because it is photochemically stable, non-toxic and low cost and were used without further purification. Monolinuron (AUGUGLIARO et al., 1995; TAPOLOV et al., 2000). This (3-(4-chlorophenyl)-1-methoxy-1-methylurea, 99%) was process is based on the generation of reactive species (electron/ Riedel- de Haën and linuron (3-(3,4-dichlorophenyl)-1- positive hole pairs) upon absorption of UV light (λ < 368 nm) methoxy-1-methylurea), 98%) was from Chem. Service. by the photocatalyst. In the presence of oxygen, the electron Titanium dioxide Degussa P25 was mostly in the anatase may induce reduction and leads to the formation of superoxide form (70% anatase, 30% rutile) with an average particle size anions. Positive holes oxidize adsorbed organic substrates or of 30 nm and BET surface area of 50 m2 g-1. Acetonitrile, react with water leading to the formation of hydroxyl radicals. HPLC grade product, was purchased from Merck. Current These radicals are well known to be strong oxidant agents reagents such as NaHCO3 and Na2CO3 were analytic grades (the reduction potential is as high as 2.8 V/HSE) and react (Merck). Water was purified by Milli-Q system (Millipore) efficiently without any selectivity with most organic substrates and controlled by its resistivity (18 MΩ cm-1). (D’OLIVEIRA et al., 1990; OKAMOTO et al., 1985; OLLIS et al., 1989). 2.2 Photocatalytic experiments -1 Phenylurea herbicides were introduced in the 1950’s and Suspensions of TiO2 (0-1.5 g L ) in aqueous solutions of their use has considerably increased.
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