Journal
RSC ADVANCES
Volume 7, Issue 54, Pages 33929-33936Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra05383e
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Funding
- National Natural Science Foundation of China [21175003, 21375003]
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Herein, we report the preparation of Cu-doped carbon dots (CDs) through a one-step hydrothermal carbonization using CuCl2 center dot 2H(2)O and ethylenediaminetetraacetic acid disodium salt dihydrate (EDTA) as precursors. As confirmed by Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS), the Cu species chelates with the carbon matrix through Cu-N complexes. Using p-nitrophenol reduction as a model reaction, the catalytic activity and performance as a fluorescence indicator in the catalytic process are further examined. Results show that the synergistic effect, which may stem from the highly efficient catalysis activity of Cu and the electron-enhanced effect from graphite-like CDs, is responsible for the catalytic activity of p-nitrophenol hydrogenation reaction with the pseudo-first-order rate constant being 1.2 x 10(-2) s(-1). Interestingly, the catalyzed reduction process of p-nitrophenol can be tracked using fluorescence spectra of Cu-doped CDs by means of the Inner Filter Effect (IFE). The unique properties of the difunctional Cu-doped CD catalyst as well as the IFE sensing strategy will provide an ideal platform to monitor the catalytic processes.
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