Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (8): 1294-1302.DOI: 10.19894/j.issn.1000-0518.210465

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Enhanced Gas⁃Liquid Chemiluminescence by Carbon Dots for Determination of Carbon Dioxide

Lian-Bo TANG1, Da-You FU1, Qi CHEN2, Yang-Run FENG2, Ya-Lin XIONG1, Zhu-Qing WANG1()   

  1. 1.School of Chemical Engineering,Sichuan University of Science & Engineering,Zigong 643000,China
    2.School of Chemical and Environmental Engineering,Sichuan University of Science & Engineering,Zigong 643000,China
  • Received:2021-09-15 Accepted:2022-01-11 Published:2022-08-01 Online:2022-08-04
  • Contact: Zhu-Qing WANG
  • About
  • Supported by:
    the Project of Zigong Science and Technology Bureau, Sichuan Province(2018YYJC12);Zigong Science and Technology Bureau Project(2017xc20)


In this study water-soluble carbon dots (CDs) that emit strong green fluorescence under the radiation of ultraviolet light was synthesized by one-step solvothermal method and characterized by transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) absorption spectrometry, fluorescence spectrometry and Fourier transform infrared spectrometry (FT-IR). Specially, this CDs could enhance the chemiluminescence (CL) of H2O2-KOH-CO2 gas-liquid CL system. Based on this phenomenon, a CL method for on-line detecting carbon dioxide was developed by using home-made gas-liquid CL detector. In order to find the optimum detection conditions, the concentrations of H2O2, KOH and CDs was studied. As a result, the maximum CL is obtained when the concentrations of H2O2 and KOH are 0.15 mol/L and 0.40 mol/L, respectively, and the volume ratio of CDs to KOH is 1∶2. Under these optimum detection conditions, there is a good linear relationship between CL intensity and carbon dioxide level in the range of 0.196~49 mg/L, and the limit of detection is 0.049 mg/L. The reproducibility is tested by measuring 1.96 and 4.56 mg/L carbon dioxide eleven times, and the relative standard deviations (RSD) are 1.46% and 0.65%, respectively. A CL method for detecting carbon dioxide has been successfully developed with high sensitivity, high selectivity, low cost and strong timeliness.

Key words: Gas-liquid CL, Carbon dots, Carbon dioxide, Real-time detecting

CLC Number: