Preparation and Adsorption Performance of Core-Shell Magnetic Molecularly Imprinted Polymers for Estradiol

The novel core-shell magnetic imprinted polymers (MIPs-E2) were prepared for selective adsorption of estradiol (E2) by template immobilization strategy, in which aniline (AN), ammonium persulfate (APS), E2 and carboxyl-modified Fe3O4 magnetic nanoparticles (Fe3O4-COOH) were employed as the functional monomer, initiator, template molecule, and carrier, respectively. The prepared nanomaterials were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The results showed that MIPs-E2 had uniform particle size, stable crystal structure and outstanding magnetism. In addition, the adsorption experiments displayed that MIPs-E2 had large adsorption capacity (21. 34 mg/g), high selectivity (IF = 2. 65, SC > 1. 89), fast mass transfer rate (30 min) and excellent reusability (adsorption efficiency remained 93. 4% after reusing for 6 cycles). This work provided a new approach for detection of the content of E2 in environmental water.