Photocatalytic Degradation of Imidacloprid by Phosphotungstic Acid Supported on a Mesoporous Sieve MCM-41

✍ Scribed by Changgen Feng; Yanzhou Li; Xia Liu

• Book ID: 102803222
• Publisher: John Wiley and Sons
• Year: 2012
• Tongue: English
• Weight: 1000 KB
• Volume: 30
• Category: Article
• ISSN: 0256-7660
• DOI: 10.1002/cjoc.201180453

✦ Synopsis

Abstract

Solid catalysts consisting of polyoxometalates (POM) namely phosphotungstic acid H~3~PW~12~O~40~ (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°C reaches 58.0% after 5 h irradiation.