Citation: JI Mao-Jing, HAI Xin, ZHOU Lu, LIU An-Nan, CUI Zhu-Mei, BI Sai. raphene Quantum Dots-based Fluorescence “Turn-On” Probe for Selective Detection of Fe(Ⅱ)[J]. Chinese Journal of Analytical Chemistry, ;2022, 50(7): 1005-1013. doi: 10.19756/j.issn.0253-3820.221076 shu

raphene Quantum Dots-based Fluorescence “Turn-On” Probe for Selective Detection of Fe(Ⅱ)

JI Mao-Jing ¹ ,
HAI Xin ² ,
ZHOU Lu ² ,
LIU An-Nan ² ,
CUI Zhu-Mei ^1,, ,
BI Sai ^1,2,,

1.
Department of Obstetrics and Gynecology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao 266003, China;
2.
College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China

Corresponding author: CUI Zhu-Mei, BI Sai,
Received Date: 16 February 2022
Revised Date: 12 April 2022

Fund Project: Supported by the National Natural Science Foundation of China (Nos.22076087, 22004077, 81802923) and the Natural Science Foundation of Shandong Province, China (Nos.ZR2020JQ08, ZR2019MH121).

A "turn-on" fluorescence probe was developed based on terephthalic acid functionalized graphene quantum dots (TPA@GQDs) for highly selective detection of Fe²⁺. The TPA@GQDs were prepared by a one-step hydrothermal method using GO as carbon source and terephthalic acid as modifying group, where potassium hydroxide served as the cutting agent and hydrogen peroxide as the auxiliary cutting agent. The structure and component of TPA@GQDs were studied by a variety of characterization methods, and the optical properties and feasibility of TPA@GQDs as a fluorescent probe were further explored. Based on the electron-donating function of Fe²⁺ to induce the fluorescence enhancement of TPA@GQDs, a "turn-on" fluorescent probe was constructed for sensitive detection of Fe²⁺. The linear ranges were from 0.33 to 20 μmol/L and 20 to 60 μmol/L, with the limit of detection (3σ) of 0.33 μmol/L, and the corresponding linear equations were F/F₀=0.0638C+1.1385 (R²=0.9974) and F/F₀=0.0244C+1.9215 (R²=0.9989), respectively. Moreover, this system demonstrated good selectivity toward Fe²⁺, and Fe³⁺ had no effect on the detection of Fe²⁺. Finally, the proposed probe was applied to accurate determination of Fe²⁺ in underground water with recoveries of 98.5%-102.0%, showing broad application prospects in water quality monitoring.
- Graphene quantum dots,
- Terephthalic acid,
- Fluorescence probe,
- Ferrous ion
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