Adsorption of diazinon and fenitrothion on nanocrystalline alumina from non-polar solvent1

摘要

Nanocrystalline γ-Alumina was prepared by the sol-gel method from aluminum sec-butoxide and, after characterization by X-ray diffraction and transmission electron microscopy, was used as an adsorbent for two common organophosphorus pesticides, diethoxy-[(2-isopropyl-6-methyl-4-pyrimidinyl)oxy]- Thiox- ophosphorane (diazinon) and dimethoxy-(3-methyl-4-nitrophenoxy)- Thioxophosphorane (fenitrothion). Absorption of these pesticides from hexane was monitored by UV-vis and 31P NMR spectroscopies. Adsorp- tion of the aforementioned pesticides by nanocrystalline alumina prepared by the sol-gel method and cal- cined at 500° C and 800° C was compared with their adsorption by micron-Size commercial alumina. Sol-gel derived nanocrystalline alumina showed significantly higher activity than commercial alumina in the destruc- tive adsorption of diazinon and fenitrothion. The bonding mode of pesticides over nanocrystalline and com- mercial γ-Aluminas was investigated by infrared spectroscopy.