Hybridization of Metal-Organic Frameworks with attapulgite for magnetic solid phase extraction and determination of benzoylurea insecticides in environmental water samples

A magnetic Metal-Organic Frameworks composite material modified with attapulgite was prepared via in situ growth method and characterized by Fourier transform infrared, X-ray diffraction, scanning electron microscopy, N-2 adsorption-desorption and vibration sample magnetometer analysis. It was applied as an efficient adsorbent for the magnetic solid-phase extraction of seven benzoylurea insecticides from environmental water samples couple with high-performance liquid chromatography detection. Under the optimized experimental conditions, the established procedure exhibited low limit of detection ranging from 0.75 to 1.5 mu g L-1 and good linear response ranging from 2.5 to 500 mu g L-1 with coefficients of determination 0.99. The method recoveries of spiked analytes at the concentrations of 20, 100 and 200 mu g L-1 in real water samples were 73.56-99.63% with the relative standard deviations < 7.53%. Moreover, the hybrid materials showed excellent reusability and there was no loss observed for the extraction efficiency within five cycles. This study highlighted the potential of functional Metal-Organic Frameworks as efficient adsorbents in sample pretreatment.