Journal
CHINESE JOURNAL OF CHEMISTRY
Volume 30, Issue 1, Pages 127-132Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.201180453
Keywords
polyoxometalates; photocatalysis; degradation; immobilization; mesoporous material; imidacloprid; pesticide
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Funding
- Institute of Chemicl Materials, China Academy of Engineering Physics
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Solid catalysts consisting of polyoxometalates (POM) namely phosphotungstic acid H3PW12O40 (HPW) supported on a mesoporous sieve MCM-41 have been prepared and characterized by FT-IR, X-ray diffraction, nitrogen adsorption and high resolution transmission electron microscope (HRTEM). The HPW/MCM-41 with different HPW loadings from 10 to 60 wt% possess large specific surface area and rather uniform mesopores. Keggin structure of HPW retains on the prepared composite catalysts. The photocatalytic performance of HPW/MCM-41 was examined by degradation of a durable pesticide imidacloprid. It is found that the prepared photocatalysts exhibit high activity under irradiation of 365 nm monochromatic light. For 50 mL of imidacloprid (10 mg/L), conversion of imidacloprid using 20 mg of HPW/MCM-41 with 50 wt% loading level and calcined at 300 degrees C reaches 58.0% after 5 h irradiation.
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