Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (6): 719-725.DOI: 10.11944/j.issn.1000-0518.2020.06.190347

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Synthesis of Red Emission Fluorescent Carbon Dots and Its Application for Detection of Persulfate

MENG Yating,JIAO Yuan,ZHANG Yuan,GAO Yifang,LU Wenjing,LIU Yang,DONG Chuan()   

  1. Institute of Environmental Science,and School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China
  • Received:2019-12-20 Accepted:2020-03-27 Online:2020-06-01 Published:2020-06-08
  • Contact: DONG Chuan
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21874087, No.21475080, No.21575084)

Abstract:

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.

Key words: red carbon dots, synthesis, fluorescence quenching, persulfate