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Preparation of polyacrylonitrile nanofibers decorated by N-doped carbon quantum dots: application as a fluorescence probe for determination of Cr(VI)

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Abstract

This study presents a new method to synthesize a fluorescence probe using an N-doped carbon quantum dot decorated polyacrylonitrile nanofiber (N-CQD@NF) nanocomposite. For this purpose, a combination of the electrospinning technique and a facile hydrothermal method was applied. Gluconic acid and ethylenediamine which are sources for carbon and nitrogen respectively, were used for synthesizing N-CQDs. Characterization of the synthesized fluorescence probe was done using photoluminescence spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FT-IR). As Cr(VI) quenches the fluorescence intensity of N-CQD@NF, it can assist in identifying Cr(VI) in environmental samples. Fluorescence probe emission quenching due to a Cr(VI) concentration was observed. It confirmed that Cr(VI) can be detected via employing the fluorescence probe. Using this method and in the optimal conditions, Cr(VI) was determined in a concentration range of 0.15–160.0 μmol L−1 with a detection limit of 0.05 μmol L−1. The selectivity of the method for Cr(VI) is high in comparison to other kinds of ions. As a result, it can be concluded that the nanocomposite is an applicable sensitive probe in determination of Cr(VI) in tap and spring water samples.

Graphical abstract: Preparation of polyacrylonitrile nanofibers decorated by N-doped carbon quantum dots: application as a fluorescence probe for determination of Cr(vi)

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Publication details

The article was received on 21 Aug 2018, accepted on 17 Oct 2018 and first published on 17 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ04261F
Citation: New J. Chem., 2018, Advance Article
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    Preparation of polyacrylonitrile nanofibers decorated by N-doped carbon quantum dots: application as a fluorescence probe for determination of Cr(VI)

    T. Madrakian, A. H. Mohammadzadeh, S. Maleki and A. Afkhami, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ04261F

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