B,N-Co-doped graphene quantum dots as fluorescence sensor for detection of Hg2+ and F− ions
| Autor: | Panxing Yang, Fanglian Yao, Jie Su, Ruiwei Guo, Caideng Yuan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Detection limit
Materials science Graphene General Chemical Engineering 010401 analytical chemistry General Engineering Analytical chemistry chemistry.chemical_element Quantum yield 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Nitrogen Fluorescence 0104 chemical sciences Analytical Chemistry law.invention Ion chemistry law Quantum dot 0210 nano-technology Boron |
| Zdroj: | Analytical Methods. 11:1879-1883 |
| ISSN: | 1759-9679 1759-9660 |
| DOI: | 10.1039/c9ay00249a |
| Popis: | Herein, we develop a fluorescence sensing platform based on boron and nitrogen co-doped graphene quantum dots (B,N-GQDs), which are synthesized by a one-step bottom-up hydrothermal method. The prepared B,N-GQDs exhibit high-fluorescence quantum yield (75%) and long fluorescence lifetime (12.86 ns). In the B,N-GQDs–Hg2+ system, the fluorescence of B,N-GQDs is quenched with increasing Hg2+ concentration due to the affinity interaction between the surface functional groups of B,N-GQDs and Hg2+. Subsequently, the quenched fluorescence of the B,N-GQDs–Hg2+ system is gradually recovered with the addition of F− ions due to their strong affinity with Hg2+. The linear ranges for the detection of Hg2+ and F− ions are 0.2–2.6 μM and 0.25–7.0 mM, respectively, and the detection limits are 0.16 μM and 0.18 mM for Hg2+ and F− ions, respectively, which are below the regulatory level of 0.25 μM and 0.526 mM in the Integrated Wastewater Discharge Standard. Therefore, B,N-GQDs provide a facile and effective approach for the detection of both Hg2+ and F− ions with real-time monitoring and high-speed measuring. |
| Databáze: | OpenAIRE |
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