Citation:
LIN Ye, LI Yue-Hai, YANG Hui, HUANG Hong-Pu, LI Lin, LI Shun-Xing. One-step Hydrothermal Synthesis of Nitrogen-doped Carbon Quantum Dots with Escherichia Coli for Selective Detection of Ferric Ion[J]. Chinese Journal of Analytical Chemistry,
;2019, 47(5): 748-755.
doi:
10.19756/j.issn.0253-3820.181699
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Nitrogen-doped carbon quantum dots (N-CQDs) with good water solubility, pH stability and salt tolerance were synthesized by hydrothermal method (180℃) with Escherichia coli as precursor. The structure of N-CQD was characterized by transmission electron microscopy, dynamic light scattering, and Fourier transform infrared spectroscopy. The results showed that the particle size was uniform with a diameter of 4.1 nm, the dispersibility was good, and the surface contained a large amount of hydrophilic groups. UV-visible absorption and fluorescence spectra were used to study optical properties, and it was found that Fe3+ could selectively quench the N-CQDs fluorescence. In the concentration range of 0.58 nmol/L-100 μmol/L, the quenching degree had a good linear relationship with the concentration of Fe3+ ion. The detection limit was 0.58 nmol/L, and the recoveries were 93.9%-108.7%. At the same time, the interference of pH, salt content and coexistence metal ion on Fe3+ determination was studied. The results showed that the method was especially suitable for selective fluorescent detection of Fe3+ in offshore seawater with high salt content, large range of pH and diverse metal ions.
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