Detection of Mercury Ions Based on N-doped Red Fluorescent Nanocarbon Dots
Nitrogen doped carbon dots(N-CDs)rich in amino groups on the surface were fabricated by one-pot hydrothermal method,which uses p-phenylenediamine and dopamine as raw materials.The prepared carbon dots were purified by centrifugation,filtration,and column chromatography.The results of the characterization made by HRTEM and fluorescence spectra showed that the carbon dots had uniform particle size and good red luminescence characteristics.Under the optimal experimental conditions,mercury ions exhibited selective quenching effect on the fluorescence intensities of N-CDs,and a good linear relationship with Hg2+concentration in the range of 0.1 μM～2.1 μM was obtained,the detection limit was 0.01 μM.Finally,the carbon dots were successfully used for the determination of Hg2+in real water samples with the recoveries of 95.0%～103.1%.
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