Determination of ferric ion via its effect on the enhancement of the chemiluminescece of the permanganate-sulfite system by nitrogen-doped graphene quantum dots

Mikrochimica Acta
Dejian LiKaile Tian

Abstract

Nitrogen-doped graphene quantum dots (NGQDs) are shown to strongly enhance the integrated chemiluminescence (CL) of the permanganate-sulfite system. The mechanism of enhancement was investigated, and the catalytic effect of the NGQDs was proven. In contrast to other carbon-based nanomaterials, the enhancement by NGQDs is independent of particle size and surface. However, the pyridinic nitrogen on the surface of the NGQDs facilitates the transformation of dissolved oxygen into H2O2 and the generation of hydroxyl radicals. This induces the increase of CL intensity. However, in the presence of Fe3+, the nitrogen functions and phenol groups on the surface of the NGQDs will chelate it, and the CL signal is decreased as a result. This effect was used to design an assay for Fe3+ that has a wide response range (1 × 10-8 - 1 × 10-6 M) and a 4 nM detection limit. The method was successfully applied to the determination of Fe3+ in spiked real water samples. Graphical abstract Nitrogen-doped graphene quantum dots (NGQDs) are demonstrated to strongly enhance the integrated chemiluminescence (CL) of the permanganate-sulfite system. The pyridinic N-atoms in NGQDs facilitate the transformation from dissolved oxygen into H2O2 and the generation...Continue Reading

References

Dec 6, 2011·Journal of the American Chemical Society·Yan LiLiangti Qu
Feb 3, 2012·The Journal of Physical Chemistry. a·Ruibo LiJin-Ming Lin
Dec 21, 2013·Analytica Chimica Acta·Jacqui L AdcockPaul S Francis
Feb 13, 2016·Analytical Chemistry·Angelina CayuelaMiguel Valcárcel
Feb 1, 2017·Advances in Colloid and Interface Science·Syed Niaz Ali Shah, Jin-Ming Lin
Jul 28, 2017·Journal of Colloid and Interface Science·Hua LiAi-Jun Wang

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