Potential Application of Nitrogen-Doped Carbon Quantum Dots Synthesized by a Solvothermal Method for Detecting Silver Ions in Food Packaging

Zifan Lu, Tiantian Su, Yanting Feng, Shiqi Jiang, Chunxia Zhou, Pengzhi Hong, Shengli Sun and Chengyong Li
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Zifan Lu: College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
Tiantian Su: College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
Yanting Feng: College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
Shiqi Jiang: Shenzhen Institute of Guangdong Ocean University, Shenzhen 518108, China
Chunxia Zhou: College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
Pengzhi Hong: College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
Shengli Sun: School of Chemistry and Environment, Guangdong Ocean University, Zhanjiang 524088, China
Chengyong Li: Shenzhen Institute of Guangdong Ocean University, Shenzhen 518108, China

IJERPH, 2019, vol. 16, issue 14, 1-11

Abstract: In this paper, nitrogen-doped carbon quantum dots (N-CQDs) were synthesized by a solvothermal method using 1,2,4-triaminobenzene as a carbon precursor. The surface of the synthesized N-CQDs was modified with amino functional groups. The results indicated that N-CQDs had various N-related functional groups and chemical bonds and were amorphous in structure. At the same time, the quantum yield of N-CQDs was 5.11%, and the average lifetime of fluorescence decay was 5.79 ns. The synthesized N-CQDs showed good selectivity for and sensitivity to Ag + . A linear relationship between N-CQDs detection efficiency and Ag + concentration was observed for concentration ranges of Ag + corresponding to 0–10 μM and 10–30 μM. In addition, N-CQDs were used for the detection of trace Ag + in food packaging material. The silver ion content of the sample determined by the N-CQDs detection method was 1.442 mg/L, with a relative error of 6.24% with respect to flame atomic absorption spectrometry, according to which the Ag + content was 1.352 mg/L. This indicates that the N-CQDs detection method is reliable. Therefore, the N-CQDs prepared in this paper can detect Ag + rapidly, simply, and sensitively and are expected to be a promising tool for the detection of trace Ag + in food packaging materials.

Keywords: Nitrogen-doped carbon quantum dots; fluorescence intensity; Ag +; food packaging material (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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