Fabrication of a Novel Surface Molecularly Imprinted Polymer Based on Zeolitic Imidazolate Framework-7 for Selective Extraction of Phthalates

In this study, a novel surface molecularly imprinted polymer based on zeolitic imidazolate framework (ZIF-7@MIP) was prepared using dibutyl phthalate (DBP) as template via “one-pot” method. The obtained ZIF-7@MIP was characterized by fourier transform infrared spectrometer (FT-IR), energy dispersive spectrum (EDS), scanning electron microscopy (SEM), nitrogen adsorption-desorption and contact angle tester. Compared with the other four adsorbents prepared, ZIF-7@MIP had higher adsorption capacity and selectivity for phthalates (PAEs) owing to combining the high specific surface area and excellent stability of ZIF and the specific recognition of MIP. An analysis method based ZIF-7@MIP coupled with high performance liquid chromatography (HPLC) was established. The linear range was 1-100 μg L-1, and the detection limit range was 0.05-0.8 μg L-1. The spiked recovery rate of PAEs from drinking water, carbonated beverages and fruit juices was 79.05-101.87%, with a relative standard deviation of 0.73-3.37% (n=3). The results indicated that the ZIF-7@MIP could be effectively employed for pretreatment of ultra-trace level of PAEs in food.