%0 Journal Article %A DONG Chuan %A GAO Yifang %A JIAO Yuan %A LIU Yang %A LU Wenjing %A MENG Yating %A ZHANG Yuan %T Synthesis of Red Emission Fluorescent Carbon Dots and Its Application for Detection of Persulfate %D 2020 %R 10.11944/j.issn.1000-0518.2020.06.190347 %J Chinese Journal of Applied Chemistry %P 719-725 %V 37 %N 6 %X

Red fluorescent carbon dots (R-CDs) were synthesized by one-step solvothermal method by using p-phenylenediamine and ethanol. The synthesized R-CDs were characterized by transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and fluorescence spectroscopy, respectively. The results indicate that the R-CDs are uniform with an average size of (3.63±0.20) nm. Abundant groups like hydroxyl and amine groups are linked on the surface of the synthesized R-CDs. The as-prepared R-CDs show excitation-independent property and the maximum excitation and emission wavelengths are 480 and 620 nm, respectively. Based on static quenching between R-CDs and persulfate, the fluorescence of R-CDs could be effectively quenched by persulfate. A fluorescent strategy is developed for detection of persulfate. The method showed a linear range of 2.5~120 μmol/L with a correlation coefficient (R2) of 0.9970. The limit of detection was 1.2 μmol/L, showing excellent sensitivity and selectivity. Meanwhile, the as-proposed sensing system is successfully applied to the analysis of persulfate in tap water and lake water samples with satisfactory results.

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