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Nowadays, great focus is given to the contamination of surface and groundwater because of the extensive usage of pesticides in agriculture. The improvements of commercial catalyst TiO 2 activity using different Au nanoparticles were investigated for mesotrione photocatalytic degradation under simulated sunlight. The selected system was 2.43 × 10 -3 % Au-S-CH 2 -CH 2 -OH/TiO 2 (0.5 g/L) that was studied by transmission electron microscopy and ultraviolet-visible (UV-Vis) spectroscopy. It was found that TiO 2 particles size was ~20 nm and ~50 nm, respectively. The Au nanoparticles were below 10 nm and were well distributed within the framework of TiO 2 . For 2.43 × 10 -3 % Au-S-CH 2 -CH 2 -OH/TiO 2 (0.5 g/L), band gap energy was 2.45 eV. In comparison to the pure TiO 2 , addition of Au nanoparticles generally enhanced photocatalytic removal of mesotrione. By examining the degree of mineralization, it was found that 2.43 × 10 -3 % Au-S-CH 2 -CH 2 -OH/TiO 2 (0.5 g/L) system was the most efficient for the removal of the mesotrione and intermediates. The effect of tert -butanol, NaF and ethylenediaminetetraacetic acid disodium salt on the transformation rate suggested that the relative contribution of various reactive species changed in following order: h + &gt; ● OH ads &gt; ● OH bulk . Finally, several intermediates that were formed during the photocatalytic treatment of mesotrione were identified.

Potential of TiO2 with Various Au Nanoparticles for Catalyzing Mesotrione Removal from Wastewaters under Sunlight