Citation: CHEN Li-Juan, LIU Ren-Yong, ZHAO Dan, YAN Ye-Han. A Novel Fluorescent Probe for Mercury Ion Detection Based on Polyethyleneimine Modified Carbon Dots[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(8): 1067-1074. doi: 10.19756/j.issn.0253-3820.191528 shu

A Novel Fluorescent Probe for Mercury Ion Detection Based on Polyethyleneimine Modified Carbon Dots

1.
College of College of Materials and Chemical Engineering, West Anhui University, Lu'an 237012, China;
2.
College of Environment and Tourism, West Anhui University, Lu'an 237012, China

Received Date: 29 August 2019
Revised Date: 28 May 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21804100), the Natural Science Foundation of Anhui Province (Nos. KJ2018A0416, 1808085QB44) and the Science Foundation of West Anhui University (Nos.WXZR201801, WGKQ201702020).

A novel carbon dots (CDs) fluorescent probe was prepared by pyrolyzing the mixture of ascorbic acid (Vc) and polyethyleneimine (PEI) aqueous solution through hydrothermal method for rapid, simple and on-site detection of mercuric ion. The particle size of CDs was characterized by TEM to be 3 nm with a good dispersivity. The fluorescence of the CDs could be quenched by Hg²⁺, while remained nearly constant when exposed to other metal ions including Na⁺, K⁺, Ca²⁺, Mg²⁺, Mn²⁺, Fe³⁺, Co²⁺, Ni²⁺, Zn²⁺, Cd²⁺, Ag⁺, Ba²⁺ and Pb²⁺, implying its good selectivity. A good linear relationship between the fluorescence quenching degree (F₀-F)/F₀ of probe and Hg²⁺ concentration was obtained with correlation coefficient (R²) of 0.9878, and the detection limit (S/N=3) for Hg²⁺ was 22 nmol/L in aqueous solution. In addition, the probe was used to determine Hg²⁺ in real water samples, and the recoveries ranged from 94.0% to 105.5% in river water, tap water and mineral water samples, proving its good practical applicability for detection of Hg²⁺ in complex water samples.
- Mercury ion,
- Heavy metal ions,
- Polyethyleneimine,
- Carbon dots,
- Fluorescence analysis
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沈阳化工大学材料科学与工程学院沈阳 110142