Authors : R. Sayeh , B. Coulomb , J.L. Boudenne and F. Belkadi
Abstract: The degradation of herbicide Diuron in aqueous solution by UV/TiO2 oxidation process was studied under various solution PH values, light intensities and types of TiO2. The removel of Diuron and intermediates was found to be more effective for acidic solution. Experimental results indicated the distribution of non-chlorinated and chlorinated intermediates on the photocatalytic degradation rate of Diuron were highly on solution PH, the volume of aqueous solution and concentration of TiO2. At the same light intensity. The adequate dosage of titanium dioxide was found to be less for alkaline solution than that for acidic solution. Increasing the light intensity would significantly increase the degradation rate of Diuron, when the two lamps vapour of mercury high pressure and low pressure are combinated at PH 6,5. The titanium dioxide (TiO2) was Degussa P-25 was used in this study the degradation. This research study the degradation of herbicide Diuron in aqueons solution by radical oxidation, the identification of some by- products by gaz Chromatography Coupled to Mass Spectropmetry (GC-MS) was studied (realised) on solution extract. The degradation rate of Diuron by the photocalysis is higher than 90% depending on the parameters influencing the oxidation. The mineralization process is rately complete and it is therefore importante to know both the nature and the concentration of intermediate by-products. The maingool of this research was to identify the Diuron oxidation reaction by-products in order to explain the reaction mechanisms and determine the efficiency factors of proposed treatments to the destroy these substances in drinking-water. The Diuron consentration in test solution was fixed at 5 mg L 1. test solution wene prepared from a standard solution by dilution in to ultra-pur water. Contact times was 60 and 120 min.
R. Sayeh , B. Coulomb , J.L. Boudenne and F. Belkadi , 2007. Elimination of Pollutants Phenyleurea Herbicides by Advanced Oxidation Processes in Aqueous Solution . Journal of Engineering and Applied Sciences, 2: 664-670.