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Simple hydrothermal preparation of carbon nanodots and their application in colorimetric and fluorimetric detection of mercury ions

机译:碳纳米点的简单水热制备及其在汞离子比色和荧光检测中的应用

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摘要

The present article reports on the one-step rapid green synthesis of water-soluble, fluorescent carbon nanodots (C-dots) with a quantum yield of 8.9%. Compared with previous hydrothermal methods, the proposed method is performed at lower temperature and results in larger size (20a€“30 nm) C-dots. We observed that UV-Vis absorbance at 302 nm of C-dots shows a significant linear correlation with the concentration of Hg2+ added, which indicates that the as-prepared carbon dots could act as a colorimetric probe for Hg2+. The linear range of this colorimetric probe is 1.0 ?— 10a?’9a€“7.0 ?— 10a?’7 mol La?’1 and the detection limit is 5.7 ?— 10a?’10 mol La?’1. Simultaneously, the fluorescence of the C-dots in pH 5.0 phosphate buffer solution can be dramatically quenched by Hg2+, whereas it is nearly unaffected by other metal ions. A good linear relationship exists between the quenching efficiency (F0/F) and the concentration of Hg2+ in the range of 7.0 ?— 10a?’9a€“7.0 ?— 10a?’7 mol La?’1 with a detection limit (3??) of 5.5 ?— 10a?’10 mol La?’1. This dual probe for Hg2+ exhibits excellent performance in polluted tap water samples analysis, suggesting its promising application in the future.
机译:本文报道了一步法快速绿色合成的水溶性,荧光碳纳米点(C点),其量子产率为8.9%。与以前的水热法相比,该方法在较低的温度下进行,结果产生较大的C点(20a至30 nm)。我们观察到C点在302 nm处的UV-Vis吸光度与所添加的Hg2 +的浓度呈显着线性相关,这表明所制备的碳点可以用作Hg2 +的比色探针。该比色探针的线性范围是1.0?-10a?'9a?“ 7.0?-10a?'7 mol La?'1,检测极限是5.7?-10a?'10 mol La?'1。同时,pH 5.0磷酸盐缓冲溶液中C点的荧光可以被Hg2 +猝灭,而几乎不受其他金属离子的影响。淬灭效率(F0 / F)与Hg2 +的浓度在7.0?-10a?'9a?” 7.0?-10a?'7 mol La?'1的范围内具有良好的线性关系(3) 5.5的Δε)=10a≤10molLa≤1。这种用于Hg2 +的双重探针在受污染的自来水样品分析中显示出卓越的性能,表明其在未来的应用前景广阔。

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