Photolysis and photodegradation of fenamiphos insecticide by using slurry and supported TiO2

Kinetics degradation of fenamiphos, an insecticide from organophosphorus class of pesticides, has been investigated in aqueous solution using UV light in absence and in presence of slurry titanium dioxide (TiO2) or supported on borosilicate glass plates. Kinetic parameters were experimentally determined and an apparent first order kinetic was observed. For photolysis process of fenamiphos, two photoproducts were identified and characterized using High Performance Liquid Chromatography/mass spectrometry (HPLC/MS). The plausible mechanism of photolysis involved is oxidation of sulphonamide group. In presence of photocatalyst, Degussa P25 shows a good photocatalytic activity and a complete degradation was observed after 180 min.