Nitrogen and copper-doped carbon quantum dots with intrinsic peroxidase-like activity for double-signal detection of phenol

Herein, a simple and facile one-step hydrothermal carbonization synthesis procedure for the fabrication of N, Cu-doped carbon quantum dots (N, Cu-CQDs) as a peroxidase-mimicking enzyme was reported. The peroxidase-like performance of N, Cu-CQDs was assessed based on the oxidative coupling reaction o...

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Bibliographic Details
Published in:Analyst (London) 2021-06, Vol.146 (13), p.428-4289
Main Authors: Du, Jinyan, Qi, Shuangqing, Fan, Tingting, Yang, Ying, Wang, Chaofeng, Shu, Qin, Zhuo, Shujuan, Zhu, Changqing
Format: Article
Language:English
Subjects:
Absorption spectra
Carbon
Colorimetry
Copper
Environmental chemistry
Fluorescence
Hydrogen peroxide
Nitrogen
Peroxidase
Phenols
Quantum dots
Signal detection
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Summary:Herein, a simple and facile one-step hydrothermal carbonization synthesis procedure for the fabrication of N, Cu-doped carbon quantum dots (N, Cu-CQDs) as a peroxidase-mimicking enzyme was reported. The peroxidase-like performance of N, Cu-CQDs was assessed based on the oxidative coupling reaction of phenol with 4-aminoantipyrine (4-AAP) in the presence of hydrogen peroxide (H 2 O 2 ). The N, Cu-CQDs/4-AAP/H 2 O 2 system was applied to sensing phenol based on double signals of absorption spectra (or colorimetric visualization) as well as fluorescence spectra. The obtained limits of detection (LODs) were as low as 0.12 μM and 0.02 μM, respectively. Moreover, the proposed method was successfully applied to the determination of phenol in sewage with satisfactory recovery. Our results demonstrate that the N, Cu-CQDs/4-AAP/H 2 O 2 /phenol sensing system has a great potential prospect for applications in environmental chemistry and biotechnology. Using the oxidative coupling reaction of phenol with 4-AAP in the presence of H 2 O 2 catalyzed by N, Cu-CQDs with an intrinsic peroxidase-like activity, a new sensing system with double signals was constructed for the detection of phenol.
ISSN:0003-2654
1364-5528
DOI:10.1039/d1an00796c