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Abstract: A red luminescent europium (Eu) complex covalently modified mesoporous silica spheres (mSiO2-Eu(TTA)3Bpc; TTA, 2-thenoyltrifluoroacetone; Bpc, 2,2'-bipyridine-4,4'-dicarboxylic acid) were designed. Then the molecularly imprinted polymers combined with fluorescence sensor were first prepared via mSiO2-Eu(TTA)3Bpc stabilized Pickering emulsion polymerization, and were further applied for selective and sensitive optosensing of λ-cyhalothrin (LC). The as-prepared mSiO2-Eu(TTA)3Bpc@MIPs were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and elemental analyzer, the results demonstrated the formation of monodisperse and uniform-sized LC-imprinted spheres. Meanwhile, fluorescence spectroscopy was used to evaluation of optical stability, effect of pH, and selective and sensitive determination of LC. The fluorescent intensity of mSiO2-Eu(TTA)3Bpc@MIPs decreased in the first 5 days and then kept stable for nearly a month. Under optical conditions, mSiO2-Eu(TTA)3Bpc@MIPs were successfully applied to selectively and sensitively detect LC in water, and a linear relationship could be obtained covering the concentration range of 10-1000 μM with a correlation coefficient of 0.9986. Moreover, LC could quench the luminescence of mSiO2-Eu(TTA)3Bpc@MIPs in a concentration-dependent manner, which was best described by a Stern-Volmer-type equation
Template and target information: λ-Cyhalothrin