Journal
ENVIRONMENTAL EARTH SCIENCES
Volume 66, Issue 2, Pages 441-445Publisher
SPRINGER
DOI: 10.1007/s12665-011-1251-1
Keywords
Photocatalysis; Imidacloprid; TiO2; H-ZSM-5
Funding
- National Natural Science Foundation of China [51078001]
- key project of Science Research [08010301106]
- project of International Science & Technology Cooperation Plan of Anhui Provence [09080703035]
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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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