Citation: DENG Xiang-Yi, FENG Ya-Li, LI Hao-Ran, DU Zhu-Wei, TENG Qing, KANG JiN-Xing, WANG Hong-Jun. Detection of Ferric Iron Based on Fluorescence Quenching Effect of N-doped Carbon Quantum Dots[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(10): 1497-1503. doi: 10.11895/j.issn.0253-3820.170344 shu

Detection of Ferric Iron Based on Fluorescence Quenching Effect of N-doped Carbon Quantum Dots

1.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;2 State Key Laboratory of Biochemical Engineering Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received Date: 31 May 2017
Revised Date: 22 August 2017

Fund Project: This work was supported by the Major Science and Technology Program for Water Pollution Control and Treatment (No. 2015ZX07205-003) and the National Natural Science Foundation of China (Nos. 21176026, 21176242).

The photoluminescence properties of carbon quantum dots depend on their size and the properties of surface functional groups. The N-doped carbon dots (using small molecular ethylenediamine) with high quantum yield and excellent dispersibility were synthesized by one-step hydrothermal method with biomass tar that was generated in the reductive smelting process as a precursor. Rapid and accurate Fe³⁺ detection based on the selective fluorescence quenching effect of N-doped carbon quantum dots was achieved. The results showed that the as-synthesized N-doped carbon quantum dots were regular spherical, uniform in size with an average particle size of 2.64 nm with a quantum yield of 26.1%, and the crystal lattice spacing was 0.25 nm, corresponding to the (100) facet of graphitic carbon structure. The functional groups on the surface of N-doped carbon quantum dots could interact with Fe³⁺ to form complex compound by coordination, leading to the fluorescence quenching effect. Fluorescence emission ratios kept a linear relationship with the concentrations of Fe³⁺ in the range of 0.23-600 μmol/L with the detection limit of 230 nmol/L.
- N-doped carbon quantum dots,
- Fluorescence quenching,
- Ferric iron,
- Biomass tar
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沈阳化工大学材料科学与工程学院沈阳 110142