Detection of Ferric Iron Based on Fluorescence Quenching Effect of N-doped Carbon Quantum Dots
10.11895/j.issn.0253-3820.170344
- VernacularTitle:基于氮掺杂碳量子点荧光猝灭效应检测Fe3+
- Author:
Yi Xiang DENG
1
;
Li Ya FENG
;
Ran Hao LI
;
Wei Zhu DU
;
Qing TENG
;
Xing JiN KANG
;
Jun Hong WANG
Author Information
1. 北京科技大学土木与资源工程学院
- Keywords:
N-doped carbon quantum dots;
Fluorescence quenching;
Ferric iron;
Biomass tar
- From:
Chinese Journal of Analytical Chemistry
2017;45(10):1497-1503
- CountryChina
- Language:Chinese
-
Abstract:
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.
