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Bedoui, A., Elsaid, K., Bensalah, N. and Abdel-Wahab, A. (2011) Treatment of Pharmaceutical-Manufacturing Waste-waters by UV Irradiation/Hydrogen Peroxide Process. Journal of Advanced Oxidation Technologies, 14, 226-234.

has been cited by the following article:

  • TITLE: Investigations on the Degradation of Triazine Herbicides in Water by Photo-Fenton Process

    AUTHORS: Sondos Dbira, Ahmed Bedoui, Nasr Bensalah

    KEYWORDS: Photo-Fenton Process, Hydroxyl Radicals, s-Triazine Herbicides, Degradation, Cyanuric Acid

    JOURNAL NAME: American Journal of Analytical Chemistry, Vol.5 No.8, June 17, 2014

    ABSTRACT: In this work, the degradation of 2-chloro-4,6-diamino-1,3,5-triazine in aqueous solutions by photo-Fenton process has been investigated. The preliminary results have shown that the degradation of 2-chloro-4,6-diamino-1,3,5-triazine by photo-Fenton process is more rapid and more effective than Fenton and UV/H2O2 processes. The effects of certain experimental parameters on kinetics and efficiency of the degradation of 2-chloro-4,6,-diamino-1,3,5-triazine by photo-Fenton process, have been evaluated. Under optimal conditions, photo-Fenton process achieved more than 90% of chloride release and about 30% of nitrate formation. The results of total organic carbon (TOC) and total Kjeldahl nitrogen (TKN) analyses have shown that no carbon dioxide and ammonia are formed during photo-Fenton treatment of aqueous solutions containing 40 mg/L triazine. These results indicate that only substituent groups of triazine ring are released; however, nitrogen atoms of triazine ring remain unaffected. A simple mechanism of degradation of 2-chloro-4,6-diamino-1,3,5-triazine has been proposed. The degradation starts by a rapid release of chlorine atoms as chloride ions to form 2-hydroxy-4,6-diamino-1,3,5-triazine. The amino groups of 2-hydroxy-4,6-diamino-1,3,5-triazine undergo are oxidized into nitro groups by hydroxyl radicals to form 2-hydroxy-4,6-dinitro-1,3,5-triazine which undergoes a slow release of nitro groups and their substitution with hydroxyl groups to form cyanuric acid and nitrate ions. The degradation of cyanuric acid by photo-Fenton process has also been investigated. The results of TOC and TKN analyzes show that no carbon dioxide is formed during the treatment.