Abstract
The sensing of chromium(VI) (Cr(VI)) is highly desired, due to its toxic and carcinogenic effects upon human health. Fluorescent probes, especially carbon nanodots (CNDs), have been widely used for Cr(VI) sensing via the inner filter effect (IFE). However, improving the sensitivity of these probes remains a difficult issue. In this work, CNDs derived from β-Lactoglobulin were applied as an ultrasensitive fluorescent probe for Cr(VI). With 260 nm excitation, the CNDs showed multi-band emission, including an ultraviolet 360 nm peak. The spectral matching of the CNDs with Cr(VI) led to synergistic suppression of both the excitation and emission light in the fluorescent sensing. As a consequence, the CNDs showed high sensitivity toward Cr(VI), the detection limit reaching as low as 20 nM. Moreover, taking advantage of the multi-emissive property of the CNDs, the synergistic effect was proven in an IFE-based sensing system, which might be extended to the design of other kinds of fluorescent probes.
Highlights
Heavy metal ions from industrial leaching have caused serious environmental problems
Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) images were obtained by a JEOL-2011 electron microscope (JEOL, Tokyo, Japan) with an accelerating voltage of
carbon nanodots (CNDs) with ultraviolet emission were synthesized from β-Lactoglobulin
Summary
Heavy metal ions from industrial leaching have caused serious environmental problems. Fluorescent probes, especially carbon nanodots (CNDs), have been widely used for Cr(VI) sensing [5,6,7,8,9,10]. 22 of of 11 rarely been discussion about the sensitivity of these fluorescent probes. The detection limit rarely been discussion about the sensitivity of these fluorescent probes. The detection limit varied with different reports, efficient methods for improving the sensitivity are still lacking. The long peptide chains of the LG protein can serve as a carbon source for the construction of the CNDs. the abundant. CNDs. The sensing mechanism was discussed, and a high sensitive fluorescent probe toward Cr(VI). Was discussed, and a high sensitive fluorescent probe toward Cr(VI) was developed based on the was developed based on the UV-emitted CNDs
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
