The composite of TiO2 and zeolite H-ZSM-5 has great photocatalytic ability for organic contaminants over a very large specific surface area and highlighted adsorption capacity. To describe abiotic degradation of imidacloprid, the photoinduced degradation of the pesticide imidacloprid in aqueous solutions, in the presence of TiO2 supported on H-ZSM-5 as photocatalyst, was performed. The study focused on the comparison of the imidacloprid degradation between photolysis and photocatalysis. The experimental results showed that the degradation of imidacloprid was more rapid in the condition of photocatalytic than that of photolysis or TiO2-only. The identification of possible intermediate products during the degradation was investigated by the high-performance liquid chromatography coupled with electrospray time-of-flight mass spectrometry (HPLC/TOF-MS). The main photocatalytic products were identified as chloronictinic acid, 1-[(6-chloro-3-pyridinyl) methyl]-2-imidazolidinone and 1-[(6-chloro-3-pyridinyl) methyl]-N-nitroso-2-imidazolidimine.
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This work was supported by the National Natural Science Foundation of China (No. 51078001), the key project of Science Research (08010301106) and the project of International Science & Technology Cooperation Plan (09080703035) of Anhui Provence.
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Tang, J., Huang, X., Huang, X. et al. Photocatalytic degradation of imidacloprid in aqueous suspension of TiO2 supported on H-ZSM-5. Environ Earth Sci 66, 441–445 (2012) doi:10.1007/s12665-011-1251-1