Photocatalytic degradation of imidacloprid in water by Ag/AgCl/ZnO/ATP
Ag/AgCl/ZnO/ATP heterojunction composite photocatalysts were successfully prepared by hydrothermal and precipitation-photoreduction methods.Due to its high efficient photocatalytic activity,the Ag/AgCl/ZnO/ATP was investigated the photodegradation performance and mechanism of imidacloprid(IMI)in water.And it exhibited excellent photocatalytic performance under visible light irradiation,and the removal ability for IMI within 30min.The degradation process conformed to the quasi-primary kinetic model,and its reaction rate constant was 7.2 times higher than that of AgCl.The photodegradation of the IMI well executed within the pH range of 5～11.Both SO42 and NO3-have a certain promotion effect on the degradation of IMI in the water,and the efficient photocatalytic performance and stability can still be maintained after 5 cycles of reuse.Combined with the characterization and experimental validation,it can be seen that the composition of the AgCl/ZnO heterojunction effectively inhibits the complexation of electron-hole pairs.Which allows IMI to undergo nitroxide removal,dechlorination,and ring-opening of pyridine and imidazole under the action of the active substances(h+,·O2-,and·OH),and ultimately realizes the efficient degradation of IMI.
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