Abstract: Ionic liquid-based molecularly imprinted polymer (IL-MMIP) was prepared using3-methacryloxypropyl trimethoxysilane-functionalized Fe3O4 as the support matrix, ethylene glycol dimethacrylate as the cross-linker agent, 4-nitrophenol (4-NP) as the template molecule, and vinyl-based ionic liquid of 1-vinyl-3-ethylimidazolium tetrafluoroborate as the functional monomer. IL-MMIP was characterized with transmission electron microscopy, Fourier transform infrared spectrometer, and magnetometer, which demonstrated that the imprinted polymer layer was successfully coated onto the surface of Fe3O4. The result showed that IL-MMIP reached the adsorption equilibrium for 4-NP within 10 min. The maximum adsorption capacity of IL-MMIP was obtained as 20. 98 μmol/ g. Compared with the magnetic non imprinted polymer, ILMMIP exhibited higher selectivity adsorption for 4-NP. The proposed method of IL-MMIP extraction coupled with high performance liquid chromatography was used for detecting phenolic compounds. The limits of detection were found to be in the range of 0.2 to 1.7 μg/L. The recoveries of four phenolic compounds in actual samples including tap water, Jiaxing nanhu lake and coking-plant wastewater were found to be between 85.7% and 100.5%.
Template and target information: 4-nitrophenol, 4-NP
Author keywords: Magnetic molecularly imprinted polymer, Vinyl-based ionic liquid, phenolic compounds, Extraction and determination, high performance liquid chromatography