Abstract
The fate of melamine has been studied under UV light irradiation (medium pressure mercury arc) in the presence of TiO 2 and H 2O 2. The increase in the concentration of aromatic and aliphatic photo-products were determined in solution concomitantly with the decrease observed for the melamine concentration. The main intermediate products occurring during photodegradation were identified by liquid chromatography coupled mass spectrometry (LC-MS) with the MS detection in positive and negative ions. The oxidation of melamine under UV-irradiation in the presence of H 2O 2 proceeds step by step leading to ammeline, ammelide, and finally to cyanuric acid. The mineralization of melamine was not observed due to the formation of cyanuric acid as intermediate photo-product. The adsorption of melamine on TiO 2 was found to vary with the pH of the suspension increasing at pH>5 due to the charge-exchange transfer between the adsorbent and the adsorbate. Two different bioassays using Vibrio fischeri and Daphnia magna have been used to test the evolution of toxicity during the UV/TiO 2/H 2O 2 treatment. The toxicity of the initial melamine solution seems to increase due to the intermediates generated in solution.
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