Flavonoid moiety-incorporated carbon dots for ultrasensitive and highly selective fluorescence detection and removal of Pb2+
| Autor: | Haimei Yang, Weili Wei, Xu Jie, Jing Xu, Fengfeng Xie, Zhining Xia |
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| Rok vydání: | 2018 |
| Předmět: |
Biocompatibility
Chemistry Metal ions in aqueous solution Quantum yield 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Fluorescence Atomic and Molecular Physics and Optics 0104 chemical sciences Metal chemistry.chemical_compound visual_art visual_art.visual_art_medium Agarose Moiety General Materials Science Electrical and Electronic Engineering 0210 nano-technology Selectivity Nuclear chemistry |
| Zdroj: | Nano Research. 11:3648-3657 |
| ISSN: | 1998-0000 1998-0124 |
| Popis: | A new type of self-targeting carbon dot (CD-Fla) for the detection of the toxic heavy metal ion Pb2+ was synthesized via a one-pot hydrothermal route using flavonoid extracts of Ginkgo biloba leaves as the starting material. As-prepared CD-Fla exhibited excellent biocompatibility and strong blue emission with a quantum yield of 16.1% and significant fluorescence quenching selectivity for Pb2+ without using any additional targeting molecules. CD-Fla could detect Pb2+ quantitatively within the range 0.1–20.0 nM, with an ultrahigh sensitivity of 55 pM. The selectivity of CD-Fla for Pb2+ was nearly one order of magnitude higher than that for other relevant metal ions. This was much better than ever reported CD-based metal ion sensors. The high sensitivity and selectivity were due to the incorporation of certain flavonoid-like moieties into CD-Fla. CD-Fla was also demonstrated to be a good probe for fluorescence tracing of intracellular Pb2+. The capability of CD-Fla was further improved when it was doped on agarose hydrogel. CD-Fla-doped agarose hydrogel (CD-AHG) allowed for visual fluorescence detection and removal of Pb2+ from water. This was confirmed by testing CD-AHG in actual water samples taken from the Jialing River (Chongqing, China). The Pb2+ adsorbed CD-AHG was regenerable in HCl solution. This study will open a new avenue for synthesizing intelligent materials capable of simultaneously targeting, detecting, and treating heavy metal ions. |
| Databáze: | OpenAIRE |
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