Abstract
In order to detect bisphenol A (BPA), one of representative endocrine disrupting chemicals (EDCs), in aqueous solution, a carbon quantum dot (CQD) was prepared using 1,3,6-trinitropyrene as a precursor by a hydrothermal synthesis method. STEM, Raman spectroscopy, FT-IR, and XPS were used for the characterization of the purified CQD (p-CD) in this work. The prepared material had a size of about 5 nm, contained many hydroxyl functional groups, and was found to have an amorphous graphene structure. In the concentration range used in this work (0 µM to 0.5 µM), p-CD showed a tendency to increase in fluorescence intensity with high linearity (R2=0.99749) as the BPA aqueous solution concentration increased. By measuring and comparing the fluorescence excitation wavelength of p-CD and the fluorescence emission wavelength of BPA, it was found that this fluorescence change occurred by the Forster resonance energy transfer (FRET) mechanism. Fluorescence experiments were also performed using benzoic acid, hydroquinone, and naphthalene, which have similar molecular structure to BPA as comparative materials. The p-CD exhibited high selectivity for BPA detection while exhibiting a 5-fold greater change in fluorescence intensity for BPA than other target substances.
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Acknowledgement
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1F1A1048770).
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Hwang, E., Lee, B. Synthesis of a fluorescence sensor based on carbon quantum dots for detection of bisphenol A in aqueous solution. Korean J. Chem. Eng. 39, 1324–1332 (2022). https://doi.org/10.1007/s11814-021-0989-8
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DOI: https://doi.org/10.1007/s11814-021-0989-8