| Molecular imprinting is a new powerful technique by preparing synthetic polymers with predetermined molecular recognition properties. Moreover, molecularly imprinted polymers display significant advantages such as high selectivity, affinity and good stability et al. In this work, four kinds of multifunctional molecularly imprinted polymers based on fluorescence quantum dots, magnetic Fe3O4 and graphene oxide were prepared with molecular imprinting technology for selective separation and recognition of estrogenic disrupting chemicals(EDCs). These polymers with magnetic and fluorescence properties had high adsorption capacity and selectivity. The prepared multifunctional composites were evaluated and characterized in detail by transmission electron microscopy, scanning electron microscopy, X-ray diffraction analysis, thermogravimetric analysis, vibrating sample magnetometer, fluorescence spectroscopy, and fluorescence microscopy. The adsorption selectivity for EDCs was also investigated.The strong fluorescent Cd Te quantum dots were obtained through optimized synthesis conditions. The magnetic fluorescence molecularly imprinted microsphere-s were prepared based on magnetic Fe3O4 and Cd Te quantum dots. The effects of the mass ratio of reactants on the properties of the imprinted polymers were research-ed. The composite exhibited uniform spherical shape and core-shell structure. Moreover, this hybrid had a saturation magnetization value of 4.79 emu·g-1, which could apply to magnetic separation and provide an efficient way to separate templates from extreme environments. The polymers with the strong fluorescence properties had the ability of selectivity recognition of the templates by the change of fluorescence intensity.The magnetic graphene oxide-based molecularly imprinted polymers were prepared with magnetic graphene oxide as support. The effects of dosage of support on properties of the imprinted polymers were researched. The polymers had magnetic properties and batch mode adsorption showed the Langmuir isotherm model and the pseudo-second-order equation were well fitted to the adsorption of the polymers. The polymers possessed excellent adsorption capacity for templates(2183 μmol·g-1 at 298 K).The fluorescence graphene oxide-based molecularly imprinted polymers were prepared based on Cd Te quantum dots and graphene oxide through optimized imprinting conditions. Owning to the use of grapheme oxide as the substrate in polymers, the resultant polymers displayed fast sensing rate and high adsorption capacity. The polymers were successfully applied for direct, sensitive, and selective fluorescence detection of templates in real water. The polymers could be reused for 5 times without significant loss of fluorescence intensity.The Cd Te/Cd S quantum dots with strong fluorescent properties and stability were obtained through optimized synthesis conditions. The magnetic fluorescence graphene oxide-based molecularly imprinted polymers based on Cd Te/Cd S quantum dots, magnetic Fe3O4 and graphene oxide were prepared. The effects of imprinting conditions on the properties of the imprinted polymers and the f luorescence quenching mechanism were researched. Graphene oxide was used to increase sensing rate and adsorption capacity, while magnetic Fe3O4 can facilitate the separation of polymers at the end of their adsorption. The polymers as fluorescent sensing material were successfully applied to the selective determination of templates in real water samples with a detection limit of 0.15 μmol·L-1. The polymers could be reused for 8 times without significant loss of magnetic properties and fluorescence intensity.The four kinds of multifunctional polymers were also used as solid-phase extraction sorbent after optimized conditions, followed by high performance liquid chromatography analysis for enrichment and analysis of trace EDCs in water, which showed good selectivity and enrichment efficiency. |
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