Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2021 Oct 19;6(43):29157-29165.
doi: 10.1021/acsomega.1c04406. eCollection 2021 Nov 2.

Dual-Mode Fluorescence and Visual Fluorescent Test Paper Detection of Copper Ions and EDTA

Wanqing Xu  1 , Xiaoliang Hao  1 , Tongtong Li  1 , Shujuan Dai  2 , Zhigang Fang  1
Affiliations

Dual-Mode Fluorescence and Visual Fluorescent Test Paper Detection of Copper Ions and EDTA

Wanqing Xu et al. ACS Omega. .

Abstract

In this study, blue-emission carbon dots were prepared from the legumes of the vegetable Pisum sativum Linn. by one-step carbonization. The fluorescence of a carbon dot (CDs) solution can be quenched by copper ions and recovered by ethylenediaminetetraacetic acid (EDTA). In addition, two kinds of visual fluorescent filter papers were prepared. Finally, a dual-mode fluorescence and visual fluorescent test paper was employed for the detection of copper ions and EDTA. The simple synthesis method and the high safety enable this material to have more application possibilities.

PubMed Disclaimer

Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
(a) TEM image, (b) averge diameter, (c) FTIR spectrum, and (d) XRD pattern.
Scheme 1
Scheme 1. Analysis Mechanism of Copper Ions and EDTA
Figure 2
Figure 2
(a) XPS spectrum. The high-resolution XPS spectra of: (b) C 1s, (c) N 1s, and (d) O 1s.
Figure 3
Figure 3
Time-resolved fluorescence decay profile (λexcitation = 340 nm and λemission = 414 nm) and the fitted curve.
Figure 4
Figure 4
(a) Emission spectra; (b) normalized emission spectra; (c) UV spectrum (black line), excitation spectrum (red line), and emission spectrum (blue line); and (d) international coordinate.
Figure 5
Figure 5
Stability of materials under the conditions of (a) temperature, (b) ionic strength, (c) time, and (d) pH.
Figure 6
Figure 6
Interferences: (a) metal ions, (b) anions, (c) agent recovery, and (d) fluorescence quenching and recovery.
Figure 7
Figure 7
Quenching time for (a) copper ions and (b) EDTA.
Figure 8
Figure 8
Quenching of fluorescence intensity. Inset: correlation between the copper ion concentration and the quenching rate (F0 – F)/F0. (F0 represents the initial state of fluorescence intensity and F represents the fluorescence intensities of copper ions added at different concentrations.)
Figure 9
Figure 9
Recovery of fluorescence intensity by EDTA. Inset: linear correlations between (F – F0)/F0 and the concentration of EDTA.
Figure 10
Figure 10
Fluorescence switching of copper ion quenching and EDTA recovery.
Figure 11
Figure 11
Copper ion test paper: (a) under sun light and (b) under UV light (blank is the common filter paper, which is not soaked in the CD solution; the concentration of copper ions is 0–400 μM).
Figure 12
Figure 12
EDTA test paper: (a) under sun light and (b) under UV light (blank is the common filter paper, which is not soaked in the CDs solution; the concentration of EDTA is 0–140 μM).
See this image and copyright information in PMC

References

    1. Sabouhi M.; Ali-Taleshi M. S.; Bourliva A.; Nejadkoorki F.; Squizzato S. Insights into the anthropogenic load and occupational health risk of heavy metals in floor dust of selected workplaces in an industrial city of Iran. Sci. Total Environ. 2020, 744, 140762.10.1016/j.scitotenv.2020.140762. - DOI - PubMed
    1. Barton C.EDTA (Ethylenediaminetetraacetic Acid). Encyclopedia of Toxicology; Elsevier Science, 2014; pp 310–311.
    1. Zhao S. J.; Lan M. H.; Zhu X. Y.; Xue H. T.; Ng T. W.; Meng X. M.; Lee C. S.; Wang P. F.; Zhang W. J. Green synthesis of bifunctional fluorescent carbon dots from garlic for cellular imaging and free radical scavenging. ACS Appl. Mater. Interfaces 2015, 7, 17054–17060. 10.1021/acsami.5b03228. - DOI - PubMed
    1. Liu W.; Diao H. P.; Chang H. H.; Wang H. J.; Li T. T.; Wei W. L. Green synthesis of carbon dots from rose-heart radish and application for Fe3+ detection and cell imaging. Sens. Actuators, B 2017, 241, 190–198. 10.1016/j.snb.2016.10.068. - DOI
    1. He W. M.; Cui X. L. Editorial: Green organic synthesis. Chin. Chem. Lett. 2021, 32, 1589–1590. 10.1016/j.cclet.2021.03.013. - DOI