Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (5): 603-610.DOI: 10.11944/j.issn.1000-0518.2019.05.180259

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Preparation of New Photoluminescent Carbon Dots and Its Application in Hg2+ Detection

HUANG Xiaomei(),DENG Xiang   

  1. Sichuan Key Laboratory of Characteristic Plant Development Research,Department of Chemistry and Chemical Engineering,Sichuan University of Arts and Science,Dazhou,Sichuan 635000,China
  • Received:2018-08-06 Accepted:2018-12-12 Published:2019-05-01 Online:2019-05-06
  • Contact: HUANG Xiaomei
  • Supported by:
    Supported by the Scientific Research Fund of the Sichuan Provincial Education Department(No.18ZA0414);the Opening Project of Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education(No.LYJ1802);the Water Treatment Research Project of Sichuan University of Arts and Science(No.2018SCL002Y)


The new photoluminescent carbon dots were prepared via high temperature pyrolysis of Chinese herbal medicine Chuan Bergamot. The average particle size of photoluminescent carbon dots is 6 nm, the maximum excitation wavelength is 285 nm, and the maximum photoluminescent emission wavelength is 340 nm. Based on the good photoluminescent properties of carbon dots and the quenching effect of Hg2+ on photoluminescence of carbon dots, a new method for the detection of Hg2+ was established. The experimental results show that the method has good selectivity and anti-interference ability with a response time of 2 min in 0.2 mol/L phosphate buffer solution(pH=7.0). The linear range of Hg2+ concentration is from 0.2 μmol/L to 40 μmol/L, the correlation coefficient is 0.9996, and the detection limit is 0.052 μmol/L. When 2.0 μmol/L and 40.0 μmol/L Hg2+ are added to the actual water sample, the relative standard deviation(RSD) and the recovery ranges are from 0.3% to 2.4% and from 99.5% to 101.1%, respectively. Therefore, it can be applied in the analysis and detection of Hg2+ in real samples.

Key words: Chuan Bergamot, photoluminescent carbon dots, photoluminescent quenching, mercury ion