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Heterogeneous Photocatalytic Degradation of Pesticide Imidacloprid by Silicotungstic Acid Supported on Mesoporous Material MCM-41

机译:介孔材料MCM-41负载硅钨酸光催化降解农药吡虫啉

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摘要

A series of new solid polyoxometalate catalysts containing silicotungstic acid H4SiW12O40 (HSiW) supported on mesoporous material MCM-41 are prepared and characterized by FT-IR, X-ray diffraction and nitrogen adsorption. The prepared HSiW/MCM-41 with different HSiW loadings level from 20 wt.% to 60 wt.% possesses large specific surface area and uniform mesopores. The Keggin unit of HSiW retains on the prepared composite catalysts. The photocatalytic performance of HSiW/MCM-41 is examined by degradation of a world-widely used pesticide imidacloprid. Results show that the prepared composites exhibit high activity under irradiation of 365 nm monochromatic Light. For 50 mL imidacloprid (10 mg/L), the conversion of imidacloprid using 20 mg HSiW/MCM-41 with 50 wt.% loading level reaches 45.66 % after 4 hours’ irradiation.
机译:制备了一系列新型的负载在介孔材料MCM-41上的含硅钨酸H4SiW12O40(HSiW)的固体多金属氧酸盐催化剂,并通过FT-IR,X射线衍射和氮吸附进行了表征。所制备的HSiW / MCM-41具有不同的HSiW负载量水平为20重量%至60重量%,具有大的比表面积和均匀的中孔。 HSiW的Keggin单元保留在制备的复合催化剂上。 HSiW / MCM-41的光催化性能通过世界范围内使用的农药吡虫啉的降解来检验。结果表明,制备的复合材料在365nm单色光的照射下表现出高活性。对于50 mL吡虫啉(10 mg / L),辐照4小时后,使用20 mg HSiW / MCM-41负载量为50 wt。%的吡虫啉转化率达到45.66%。

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