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. 2020 Mar 3;5(10):5540-5547.
doi: 10.1021/acsomega.0c00195. eCollection 2020 Mar 17.

Facile Synthesis of Luffa Sponge Activated Carbon Fiber Based Carbon Quantum Dots with Green Fluorescence and Their Application in Cr(VI) Determination

Binhua Luo  1 , Hang Yang  1 , Boxun Zhou  1 , Sanjrani Manzoor Ahmed  1 , Yi Zhang  2 , Huamin Liu  3 , Xiaowen Liu  3 , Yong He  3 , Shibin Xia  1
Affiliations

Facile Synthesis of Luffa Sponge Activated Carbon Fiber Based Carbon Quantum Dots with Green Fluorescence and Their Application in Cr(VI) Determination

Binhua Luo et al. ACS Omega. .

Abstract

Carbon quantum dots (CQDs) were prepared by a chemical oxidation method using luffa sponge based activated carbon fiber as the raw material. The obtained CQDs were well characterized. The fluorescence quenching effect of Cr(VI) ion on CQDs was investigated. The results show that the addition of Cr(VI) changes the intensity of the ultraviolet characteristic absorption peak of CQDs, and causes static quenching of the fluorescence of CQDs. With the increase in the Cr(VI) concentration, the fluorescence of CQDs was gradually extinguished linearly.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
(a) TEM image, (b) HRTEM image (inset: lattice spacing), (c) SAED patterns, and (d) particle size distribution (DLS) of CQDs.
Figure 2
Figure 2
(a) UV–vis spectrum (inset: picture of carbon quantum dot solution under visible light (left) and UV light (right)), (b) full spectra of excitation and emission, (c) emission spectra obtained at different excitation wavelengths, and (d) fluorescence decay lifetime of CQDs under 360 nm excitation wavelengths.
Figure 3
Figure 3
(a) FTIR, (b) XRD, and (c) Raman spectra of CQDs.
Figure 4
Figure 4
(a) Emission spectra obtained at different Cr(VI) concentrations, (b) the normal curve of F0/F under excitation at 360 nm, and (c) the effect of other metal ions on F0/F.
See this image and copyright information in PMC

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