4.7 Article

One-step synthesized fluorescent nitrogen doped carbon dots from thymidine for Cr (VI) detection in water

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2019.117165

关键词

Carbon dots; Cr (VI); Fluorescent sensor; Inner filter effect (IFE)

资金

  1. National Natural Science Foundation of China [81772290, 81271930]
  2. Graduate Scientific Research and Innovation Foundation of Chongqing, China [CYB18026]
  3. Chongqing Science and Technology Commission [CSTC2018jcyjAX0062]
  4. Solid-state Fermentation Resource Utilization Key Laboratory of Sichuan Province [2018GTJ010]
  5. Brew Microorganisms Technology and Applica-tion of Key Laboratory Project in Sichuan Province [NJ2018-01]
  6. sharing fund of Chongqing University's large equipment

向作者/读者索取更多资源

A novel, simple and low-cost nitrogen doped carbon dots (N-CDs) fluorescent sensor for sensitive detection of Cr (VI) was developed via one-step hydrothermal method using thymidine as carbon source. As-prepared N-CDs exhibited the ability of sensitive and selective detection of Cr (VI) through the inner filter effect (IFE). The performances of N-CDs were investigated with the characterization methods of transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Under the optimized conditions, a good logarithmcorrelation between the fluorescence intensity of N-CDS and the concentration of Cr (VI) was obtained ranging from 0.1 mu M to 430 mu M(R-2=0.992), with a low detection limit (LOD; S/N=3) of 1.26 nM. The fluorescent sensor showed good repeatability, reproducibility and stability. Furthermore, N-CDs fluorescent sensor had a good applicability for Cr (VI) detection in real water samples with acceptable recoveries, and the detection results were consistent with the inductively coupled plasma mass spectrometry (ICP-MS) results, indicating this fluorescent sensor has a great potential for the environmental monitoring. (C) 2019 Elsevier B.V. All rights reserved.

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