The photocatalytic behaviour of various semiconductor powders (TiO2, ZnO, WO3, SnO2 Fe2O3) toward atrazine degradation in aqueous solution is investigated under irradiation with light of wavelength > 340 nm. Degradation rates and intermediate formation under irradiation were also followed in homogeneous solution and in the presence of an insulator such as Al2O3. The comparison of the results suggests that the degradation process in the presence of TiO2, ZnO and WO3 is photocatalytic and progresses through the generation of active species which promote mainly the alkyl chain oxidation. Hydroxyatrazine is conversely formed in the presence of Al2O3. This predominant path is ascribed to the adsorption catalysed hydrolysis. Amongst the different metal oxides, TiO2 appears the most efficient.
Photoinduced Degradation of Atrazine over Different Metal Oxides
PELIZZETTI, Ezio;MINERO, Claudio;
1993-01-01
Abstract
The photocatalytic behaviour of various semiconductor powders (TiO2, ZnO, WO3, SnO2 Fe2O3) toward atrazine degradation in aqueous solution is investigated under irradiation with light of wavelength > 340 nm. Degradation rates and intermediate formation under irradiation were also followed in homogeneous solution and in the presence of an insulator such as Al2O3. The comparison of the results suggests that the degradation process in the presence of TiO2, ZnO and WO3 is photocatalytic and progresses through the generation of active species which promote mainly the alkyl chain oxidation. Hydroxyatrazine is conversely formed in the presence of Al2O3. This predominant path is ascribed to the adsorption catalysed hydrolysis. Amongst the different metal oxides, TiO2 appears the most efficient.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
