Surface Molecular Imprinting on Silica-Coated CdTe Quantum Dots for Selective and Sensitive Fluorescence Detection of p-aminophenol in Water

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• 作者：Xialin Lu ; Fangdi Wei ; Guanhong Xu ; Yanzi Wu ; Jing Yang ; Qin Hu
• 关键词：Silica ; coated CdTe quantum dots ; Surface molecular imprinting ; p ; aminophenol ; Fluorimetry
• 刊名：Journal of Fluorescence
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：27
• 期：1
• 页码：181-189
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine, general; Biological and Medical Physics, Biophysics; Biotechnology; Biochemistry, general; Analytical Chemistry;
• 出版者：Springer US
• ISSN：1573-4994
• 卷排序：27

文摘

In this paper, a selective and sensitive sensor for the determination of p-aminophenol (PAP) was developed by grafting molecularly imprinted polymers (MIPs) on the surface of silica-coated CdTe quantum dots (CdTe@SiO₂@MIPs). The obtained CdTe@SiO₂@MIPs were characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy and fluorescence spectroscopy. The fluorescence intensity of CdTe@SiO₂@MIPs was more strongly quenched by PAP than that of the structural analogues of PAP. Under the optimal conditions, the fluorescence intensity of the CdTe@SiO₂@MIPs decreased sensitively with the increase of PAP concentration in the range of 0.05–50 μM. The limit of detection was 0.02 μM (3σ/K_sv). The sensor was successfully used to determine PAP in tap and lake water samples, and the average recoveries of PAP at various spiking levels ranged from 97.33 % to 103.3 % with relative standard deviations below 20 %.