文摘
A red luminescent europium (Eu) complex covalently modified mesoporous silica spheres (mSiO2鈥揈u(TTA)3Bpc; TTA, 2-thenoyltrifluoroacetone; Bpc, 2,2鈥?bipyridine-4,4鈥?dicarboxylic acid) were designed. Then the molecularly imprinted polymers combined with fluorescence sensor were first prepared via mSiO2鈥揈u(TTA)3Bpc stabilized Pickering emulsion polymerization, and were further applied for selective and sensitive optosensing of 位-cyhalothrin (LC). The as-prepared mSiO2鈥揈u(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鈥揈u(TTA)3Bpc@MIPs decreased in the first 5 days and then kept stable for nearly a month. Under optical conditions, mSiO2鈥揈u(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鈥?000 渭M with a correlation coefficient of 0.9986. Moreover, LC could quench the luminescence of mSiO2鈥揈u(TTA)3Bpc@MIPs in a concentration-dependent manner, which was best described by a Stern鈥揤olmer-type equation.