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The Fe3O4/SiO2 (400 mg) was dispersed in 100 mL of methylbenzene for 2.0 h. Then 2.0 mL of MPS was added to the above dispersion. The reaction mixture was intensely stirred at 600 rpm under 80 °C for 10 h, the resultant product collected by an external magnetic field, and rinsed six times with ethanol and doubly distilled water, respectively. Finally, the Fe3O4/SiO2-MPS particles obtained were dried under vacuum at 60 °C for 12 h. Synthesis of Fe3O4/SiO2-MPS/MIPs and Fe3O4/SiO2-MPS/FNIPs Allyl fluorescein was prepared according to the literature [21, 31]. In a typical synthetic procedure, a mixture of fluorescein (2.00 g, 6.0 mmol), allyl bromide (2.42 g, 20.0mmol), K2CO3 (4.97 g, 36.0 mmol), hydroquinone and iodine (trace), and anhydrous DMF (60 mL) was heated and stirred at 71 °C in the dark under N2 for 25 h. The solvent was removed under reduced pressure. The crude product was recrystallized from chloroform, and the resulting product was purified by column chromatography on silica. The synthesis of Fe3O4/SiO2-MPS/MIPs via a multistep procedure is illustrated in Fig. 1; 0.4999 g (1 mmol) of LC, 0.2840 g (4 mmol) AM, and 0.03 g AF were dissolved with 10 mL of acetonitrile in a dark environment for 1.0 h. Then the Fe3O4/SiO2-MPS (0.2 g) was dispersed with 40 mL of acetonitrile in an ultrasonic bath for 1.5 h. Subsequently, the mixture of LC/AM/AF was mixed with appropriate amounts of DVB (0.4, 0.8, 1.6, and 3.2 mL, respectively) and 40 mL dispersed liquid of Fe3O4/SiO2-MPS for 30 min stirring at 60 °C. At the same time, the solution was sparged with oxygen-free nitrogen for 10 min in order to purge air. Lastly, 0.1 g of AIBN was added in the flask under N2 protection. The mixture was stirred at 600 rpm and allowed to proceed at 60 °C under N2 protection for 24 h. After magnetic separation, the microspheres were eluted with methanol/acetic acid (100 mL, 90/10 v/v) to remove templates by Soxhlet extractor and dried in a vacuum at 40 °C for 24 h. Finally, we obtained |
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