Journal
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
Volume 16, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/ijerph16142518
Keywords
Nitrogen-doped carbon quantum dots; fluorescence intensity; Ag+; food packaging material
Funding
- National Natural Science Foundation of China [21874029]
- Guangdong Yangfan Program [201635018]
- Guangdong Special Support Program [2017TQ04N706]
- Science and Technology Planning Project of Guangdong Province [2016A020210114]
- Science and Technology Planning Project of Shenzhen City [JCYJ20170818111719650]
- Industrial Development Special Funds of Dapeng New Area [KY20170209, KY20180202]
- Innovation and Development Project aboutMarine Economy Demonstration of Zhanjiang City [2017C8B1]
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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 mu M and 10-30 mu M. 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.
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