Ultrasonic synthesis of {Zn4O(C24H15N6O6)(2)(H2O)(2)center dot 6H(2)O center dot DMF} 3D MOF nanostructures: new precursor to prepare zinc oxide nanoparticles and their application for alpha-cypermethrin adsorption

摘要

Nanostructures of the metal-organic framework {Zn4O(C24H15N6O6)(2)(H2O)(2)]center dot 6H(2)O center dot DMF]}, DMF = N,N-dimethylformamide (1) have been synthesized via a sonochemical method. The prepared MOF was calcinated at 800 A degrees C to prepare nano-ZnO. Scanning electron microscopy, powder X-ray diffraction and infrared (IR) spectroscopy were used to characterize the compound 1 and ZnO nanoparticles. Application of nano-ZnO for the removal of alpha-cypermethrin [(R)-alpha-cyano-3-phenoxybenzyl (1S)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate and (S)-alpha-cyano-3-phenoxybenzyl (1R)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate] (ACYP) as pesticide pollutants was investigated by using UV-Vis spectroscopy, thermal gravimetric analysis, and IR and NMR spectroscopies. The effects of some parameters such as adsorbent dosage, exposure time, temperature and pH on the adsorption were studied. The results showed that 0.5 g of the nano-ZnO at room temperature and pH 7 could remove 82 % of alpha-cypermethrin (0.1 mg L-1) from 25 mL water/methanol (80:20, v/v) solution.