Abstract：Nano-Fe3O4 was prepared by solvothermal method, and the prepared Fe3O4 nanoparticles were dispersed in tetraethyl orthosilicate（TEOS）hydrolysate to deposite a layer of silica on the surface. Methacryloxypropyltrimethoxysilane (MPS) was used for SiO2-Fe3O4 surface modification to obtain MPS-SiO2-Fe3O4. Methacrylic acid (MAA) and diethylstilbestrol (DES) were added into acetonitrile solvent with molar ratio of 4 ∶1 for 12 h self-assembly, and MPS-SiO2-Fe3O4, ethylene glycol dimethacrylate (EGDMA) and azobisisobutyronitrile (AIBN) were added for ultrasonically dispersing for 30 min with latter mechanically stirring at 65 ℃ for 24 h to obtain DES magnetic molecularly imprinted polymer (MMIP). The characterization was conducted by transmission electron microscopy, vibrating sample magnetometer and adsorption experiments. The results show that the saturation magnetic intensity of MMIP is 268 kA/m without hysteresis and with zero coercivity and super paramagnetic properties, and MMIP can be rapidly separated from the solution in 17 s under the action of magnet. At room temperature, the maximum static adsorption capacity of MMIP to DES is 7.1 mg/g, and MMIP can reach more than 90% of the maximum adsorption capacity in 60 min during dynamic adsorption. The imprinting factor of MMIP to DES is 3.70, which shows great ability to identify DES. MMIP can be reused more than six times with good renewable performance.
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