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Citation: JIA Jing, LU Wen-Jing, LI Lin, JIAO Yuan, GAO Yi-Fang, SHUANG Shao-Min. Orange Luminescent Carbon Dots as Fluorescent Probe for Detection of Nitrite[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(4): 560-566. doi: 10.19756/j.issn.0253-3820.181787 shu

Orange Luminescent Carbon Dots as Fluorescent Probe for Detection of Nitrite

1.
School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China;
2.
Institute of Environmental Science, Shanxi University, Taiyuan 030006, China

Received Date: 19 December 2018
Revised Date: 24 January 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21575084, 21874087).

Orange luminescent nitrogen doped carbon dots (N-CDs) were prepared via one-step hydrothermal treatment by using p-phenylenediamine and citric acid as precursors. The morphology and optical properties of the N-CDs were characterized by transmission electron microscopy, fourier transform infrared spectra, ultraviolet-visible absorption spectroscopy and fluorescence spectroscopy. The results showed that the synthesized N-CDs had an extreme small size ((1.62±0.35) nm), good water solubility and excellent fluorescent stability. The addition of nitrite (NO₂^-) caused a fluorescence increase of N-CDs. Based on this phenomenon, a new fluorescence analysis method for detecting NO₂^- was established. The linear range for detection of nitrite was 8-100 μmol/L, and the detection limit was 0.65 μmol/L. The possible fluorescence enhancement mechanism was presented. Furthermore, the constructed fluorescence sensing system was applied to the detection of NO₂^- in sausage, pickle and tap water samples with satisfactory results.
- Carbon dots,
- Orange fluorescence,
- Enhanced fluorescent probe,
- Nitrite
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