Nitrogen-doped carbon dots as fluorescent probes for sensitive and selective determination of Fe3.
Spectrochim Acta A Mol Biomol Spectrosc
; 316: 124347, 2024 Aug 05.
Article
em En
| MEDLINE
| ID: mdl-38678843
ABSTRACT
At present, the contamination of water resources by heavy metal ions has posed a significant threat to human survival. Therefore, it is particularly critical to develop low-cost, easy-to-use, and highly efficient heavy metal detection technologies. In this work, a fast and cost-effective fluorescent probe for nitrogen-doped carbon dots (N-CDs) was prepared using one-step hydrothermal method with citric acid (CA) as carbon source, and melamine as nitrogen source. The structural and optical characterizations of the resulting N-CDs were investigated in details. The results showed that the quantum yield of the prepared fluorescent probe was as high as 45 %, and an average fluorescence lifetime was about 7.80 ns. N-CDs have excellent water solubility and dispersibility, with an average size of 2.58 nm. N-CDs exhibited excellent specific responsiveness to Fe3+ and can be used as an effective method for detecting Fe3+ at low-concentrations (the concentrations of N-CDs as low as 0.24 µg/mL) using fluorescent probes. The linear response of the fluorescent probe N-CDs to Fe3+ was formed in the concentration range of 20-80 µM, and the detection limit was 3.18 µM. In addition, in the actual water samples analysis, the recovery rate reached 97.05-100.58 %. The prepared of N-CDs provide available Fe3+ fluorescent probes in the environment.
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MEDLINE
Assunto principal:
Espectrometria de Fluorescência
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Carbono
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Pontos Quânticos
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Limite de Detecção
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Corantes Fluorescentes
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Nitrogênio
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article