There are few researches on the application of multifunctional carbon quantum dots (CQDs) in analysis and detection. In this study, carbon quantum dots (CQDs) with dual-function detection were synthesized by the one-step hydrothermal method with citric acid as the carbon source and o-phenylendiamine as the nitrogen source to detect Fe3+ and sunset yellow. The morphology of the prepared CQDs and the surface functional groups were characterized using TEM, FTIR, XPS, UV-Vis spectroscopy, and fluorescence spectrophotometer. The results show that the morphology of CQDs is nearly spherical and well dispersed, with a particle size range of 1.24 similar to 6 nm and the average particle size was 3.23 nm. The surface of the CQDs has hydrophilic groups, such as OH, -COOH and -NH2. CQDs exhibited good acid and alkali resistance, salt resistance, and photobleaching resistance under different conditions. The detection limits of CQDs for Fe3+ and sunset yellow were 1.52 mu M and 0.812 mu M, respectively. The recoveries of actual samples were 96.65 similar to 104.85 and 95.4 similar to 104.55 , with relative standard deviations (RSDs) of less than 6 . Therefore, CQDs can be employed as dual-function fluorescent probes in the practical detection of samples and have promising application prospects.
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