Volume 8 Issue 1
Feb.  2023
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Article Navigation >  Green Energy&Environment  > 2023  >  8(1): 141-150
Siyuan Sun, Weijie Bao, Fan Yang, Xingru Yan, Yang Sun, Ge Zhang, Wang Yang, Yongfeng Li. Electrochemical synthesis of FeNx doped carbon quantum dots for sensitive detection of Cu2+ ion. Green Energy&Environment, 2023, 8(1): 141-150. doi: 10.1016/j.gee.2021.04.005
Citation: Siyuan Sun, Weijie Bao, Fan Yang, Xingru Yan, Yang Sun, Ge Zhang, Wang Yang, Yongfeng Li. Electrochemical synthesis of FeNx doped carbon quantum dots for sensitive detection of Cu2+ ion. Green Energy&Environment, 2023, 8(1): 141-150. doi: 10.1016/j.gee.2021.04.005
shu

Electrochemical synthesis of FeNx doped carbon quantum dots for sensitive detection of Cu2+ ion

doi: 10.1016/j.gee.2021.04.005

  • State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Changping, Beijing, 102249, China

Funds:

We gratefully thank for the National Natural Science Foundation of China (Nos. 21776302 and 21776308), and the Science Foundation of China University of Petroleum, Beijing (No. 2462020YXZZ033).

  • Received date 13 December 2020, Accepted date 02 April 2021, RevRecd date 22 March 2021, Publish date 06 April 2021,
    Abstract
  • A novel strategy was developed to fabricate FeNx-doped carbon quantum dots (Fe-N-CQDs) to detect Cu2+ ions selectively as a fluorescence probe. The Fe-N-CQDs were synthesized by an efficient electrolysis of a carbon cloth electrode, which was coated with monoatomic iron-anchored nitrogen-doped carbon (Fe-N-C). The obtained Fe-N-CQDs emitted blue fluorescence and possessed a quantum yield (QY) of 7.5%. An extremely wide linear relationship between the Cu2+ concentration and the fluorescence intensity was obtained in the range from 100 nmol L-1 to 1000 nmol L-1 (R2 = 0.997), and the detection limit was calculated as 59 nmol L-1. Moreover, the Fe-N-CQDs demonstrated wide range pH compatibility between 2 and 13 due to the coordination between pyridine nitrogen and Fe3+, which dramatically reduced the affection of the protonation and deprotonation process between H+ and Fe-N-CQDs. It is notable that the Fe-N-CQDs exhibited a rapid response in Cu2+ detection, where stable quenching can be completed in 7 s. The mechanism of excellent selective detection of Cu2+ was revealed by energy level simulation that the LUMO level of Fe-N-CQDs (-4.37 eV) was close to the redox potential of Cu2+, thus facilitating the electron transport from Fe-N-CQDs to Cu2+.

     

    • • Fe-N-CQDs was synthesized by electrolysis method from monoatomic iron-anchored nitrogen doped carbon (Fe-N-C). • Fe-N-CQDs was capable of possessing good pH compatibility and exhibiting rapidly detection response in Cu2+ detection. • The unique structure of FeNx in Fe-N-C is reserved integrally, which endows special properties to Fe-N-CQDs.
    The first two authors contributed equally to this work.
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