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Abstract: In this paper, we have presented a custom-tailored strategy to fabricate molecularly imprinted composite sensors (MIPs/QDs@SiO2) with highly selective recognition ability for the determination of sulfanilamides (SAs). The modified SiO2 sphere, modified QDs, acrylamide (AM), and ethyl glycol dimethacrylate (EGDMA) were used as the supporter, the fluorescent material, the functional monomer, and the cross-linker, respectively. Afterward, a two-step imprinting polymerization reaction was implemented to fabricate the novel sensor MIPs/QDs@SiO2. Attributing to the SiO2 with the surface functional monomer and the QDs with functional group, SAs molecules are attracted to the QDs and bound to the SiO2 surface, hence accelerating the growth of homogeneous recognition sites on the surface of SiO2 and guaranteeing the distance between the recognition sites and the QDs. After the experimental conditions were optimized, such fluorescence sensors can be used for well selective detection of SAs with a linear range of 2.0-30 μmol/L and a limit of detection is 0.17 μmol/L. Most importantly, the MIPs/QDs@SiO2 can be successfully applied to the determination of SAs in real river water, which demonstrate high selectivity and stability and offer a promising platform for detecting environmental pollutants
Template and target information: sulfanilamides, SAs
Author keywords: CdTe Quantum dots, fluorescence detection, Surface molecular imprinted polymers, sulfonamide