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Issue 38, 2017
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Purification of nitrogen-doped graphene quantum dots via the liquid–liquid extraction system of tetrahydrofuran–(NH4)2SO4–water and its application to sensitive iron(III) ions determination

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Abstract

A facile, rapid method based on a liquid–liquid extraction system for the purification of graphene quantum dots is reported in this study. Nitrogen-doped graphene quantum dots (N-GQDs) were synthesized by a simple hydrothermal route for cutting graphene oxide sheets. Then, through the liquid–liquid extraction system of tetrahydrofuran–(NH4)2SO4–water, N-GQDs have been successfully purified. The as-prepared N-GQDs have an average size of 6 nm and exhibit optimum excitation and emission wavelengths of 330 and 435 nm, respectively. N-GQDs were demonstrated as a sensitive fluorescent sensing probe for Fe3+. The sensor can detect Fe3+ (R2 = 0.992) in the concentration range of 0.2–30 μM, with a detection limit of 0.06 μM. This method of quantitative analysis of Fe3+ has good linearity and reliable reproducibility.

Graphical abstract: Purification of nitrogen-doped graphene quantum dots via the liquid–liquid extraction system of tetrahydrofuran–(NH4)2SO4–water and its application to sensitive iron(iii) ions determination

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Publication details

The article was received on 28 Jul 2017, accepted on 10 Sep 2017 and first published on 11 Sep 2017


Article type: Paper
DOI: 10.1039/C7AY01841J
Citation: Anal. Methods, 2017,9, 5691-5696
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    Purification of nitrogen-doped graphene quantum dots via the liquid–liquid extraction system of tetrahydrofuran–(NH4)2SO4–water and its application to sensitive iron(III) ions determination

    W. Zhang, S. Tang, S. Zhang and Y. Chen, Anal. Methods, 2017, 9, 5691
    DOI: 10.1039/C7AY01841J

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