Detection of Fe3+ and Hg2+ by N and S Doped CDs Fluorescence Probe
[1]LIU Huadong,XU Haoxuan,LI Hewei,et al.Detection of Fe3+ and Hg2+ by N and S Doped CDs Fluorescence Probe[J].Journal of Zhengzhou University (Engineering Science),2022,43(06):64-69.[doi:10.13705/j.issn.1671-6833.2022.03.019]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
43
Number of periods:
2022 06
Page number:
64-69
Column:
Public date:
2022-09-02
- Title:
- Detection of Fe3+ and Hg2+ by N and S Doped CDs Fluorescence Probe
- Keywords:
- CDs; detection of metal ions; fluorescence probe; fluorescence quenching; selectivity and sensitivity
- CLC:
- O613. 71；O622. 6
- DOI:
- 10.13705/j.issn.1671-6833.2022.03.019
- Abstract:
- In order to realize the rapid and simple detection of Fe3+ and Hg2+ in aqueous solution, sulfur and nitrogen co-doped carbon quantum dots fluorescent probes were synthesized by one-step hydrothermal method using citric acid and thiourea as precursors. The morphology and fluorescence properties of the N—S—CDs were analyzed by transmission electron microscope, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, fluorescence spectrophotometer, and ultraviolet-visible absorption spectroscopy. The results showed that the average particle size of N—S—CDs was 8 nm, which was uniformly distributed. The surface was rich in various functional groups and has good water solubility. The strong blue fluorescence was emitted from N—S—CDs under the irradiation of ultraviolet lamp, and the fluorescence quantum yield was as high as 36.8%. With the increase of excitation wavelength, the fluorescence intensity of N—S—CDs emission peak increased at first and then decreased, and the fluorescence intensity reached the highest at 440 nm, and the emission peak was obviously red-shifted with the excitation wavelength. N—S—CDs had high selectivity for Fe3+ and Hg2+. There was a good linear relationship between the fluorescence intensity and the two ions when the concentration of Fe3+ was in the range of 40—130 μmol/L and the concentration of Hg2+ was in the range of 40—80 μmol/L.The linear regression equations are F0/F=0.021 32cFe3++ 0.349 45 and F0/F=0.186 11cHg2+-6.271 14, and the lowest detection limits were 1.4 μmol/L and 0.16 μmol/L, respectively. The application of N—S—CDs to the real sample analysis of tap water and lake water could effectively detect Fe3+ and Hg2+. The quantitative recovery of Fe3+ was between 97.16% and 103.62%, and that of Hg2+ was between 93.58% and 101.22%.
- References:
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Last Update:
2022-10-03