Abstract
The photocatalytic degradation of terbufos in aqueous suspensions was investigated by using titanium dioxide (TiO 2) as a photocatalyst. About 99% of terbufos was degraded after UV irradiation for 90 min. Factors such as pH of the system, TiO 2 dosage, and presence of anions were found to influence the degradation rate. Photodegradation of terbufos by TiO 2/UV exhibited pseudo-first-order reaction kinetics, and a reaction quantum yield of 0.289. The electrical energy consumption per order of magnitude for photocatalytic degradation of terbufos was calculated and showed that a moderated efficiency ( E EO = 71 kWh/(m 3 order)) was obtained in TiO 2/UV process. To obtain a better understanding of the mechanistic details of this TiO 2-assisted photodegradation of terbufos with UV irradiation, the intermediates of the processes were separated, identified, and characterized by the solid-phase microextraction (SPME) and gas chromatography/mass spectrometry (GC/MS) technique. The probable photodegradation pathways were proposed and discussed.
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