Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 219, Issue -, Pages 15-22Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2019.02.017
Keywords
Fluorescent carbon dots; Enrofloxacin; Fluorescence probe
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Funding
- Natural Science foundation of China [31371085]
- China Association for Medical Education [2016SKT-M019]
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Enrofloxacin (ENR) is one of the environmental pollutants need to remove in many wastewater treatment processes. Traditional methods for measuring ENR are often complex and time-consuming. Due to their low cost and high efficiency, fluorescent carbon dots can be used for detecting many pharmaceuticals. In this contribution, nitrogen doped fluorescent carbon dots (N-CDs) were firstly synthesized with a fluorescence quantum yield of 20.5%. The N-CDs can emit strong blue fluorescence when excited at 368 nm and there exist a large amount of carboxyl, hydroxyl and amine groups on their surfaces. In addition, the fluorescence of N-CDs could be quenched in the presence of Cu2+, which could be gradually restored upon adding ENR. Thereby, a rapid and sensitive fluorescent sensing strategy based on the fluorescence recovery of the N-CDs-Cu2+ system was designed for selective detection of ENR. The possible sensing mechanism was also proposed in terms of the results of resonance Rayleigh scattering, UV-vis absorption and Fourier transform infrared (FITR) spectra. Under the optimal condition, a good linear relationship was obtained for ENR determination with concentrations ranging from 1.0 to 15.0 mu g.mL(-1) and the detection limit of 0.16 mu g.mL(-1) was achieved. Finally the proposed sensing system was applied for the detection of ENR in real water samples with satisfactory results. (C) 2019 Published by Elsevier B.V.
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