Detection of Fe3+ and Hg2+ Ions by Using High Fluorescent Carbon Dots Doped With S And N as Fluorescence Probes

• Published in: Journal of fluorescence Vol. 32; no. 3; pp. 1089 - 1098
• Main Authors: Liu, Huadong, Xu, Haoxuan, Li, Hewei
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2022; Springer Nature B.V
• Subjects: Analytical Chemistry; Aqueous solutions; Biochemistry; Biological and Medical Physics; Biomedical and Life Sciences; Biomedicine; Biophysics; Biotechnology; Carbon dots; Citric acid; Drinking water; Ferric ions; Fluorescent indicators; Functional groups; Mercury (metal); Nitrogen; Original Article; Quantum dots; Selectivity; Detection of Hg; and Fe; ions; Fluorescent probes; N-S-CDs
• ISSN: 1053-0509; 1573-4994; 1573-4994
• DOI: 10.1007/s10895-022-02921-6

In this paper, carbon quantum dots (N-S-CDs) containing sulfur and nitrogen were synthesized using citric acid and thiourea. The average particle size of N-S-CDs is 8 nm. The N-S-CDs surface contains various of functional groups, which has good water solubility. The fluorescence quantum yield of N-S-CDs is as high as 36.8%. N-S-CDs emits strong blue fluorescence in aqueous solution and has good photostability in neutral and alkaline NaCl solution. N-S-CDs has unique selectivity and high sensitivity to Fe 3+ and Hg 2+ ions, and the lowest detection limits are 1.4 μM and 0.16 μM, respectively. Under the interference of other metal ions, Fe 3+ and Hg 2+ ions can still effectively and stably quench the fluorescence of N-S-CDs. In addition, in the detection of actual samples, N-S-CDs can effectively detect Fe 3+ and Hg 2+ ions in tap water and lake water.