Issue 8, 2020

Nitrogen and sulfur co-doped fluorescent carbon dots for the trapping of Hg(ii) ions from water

Abstract

An uncomplicated, reliable, and ultrasensitive fluorescent sensor motif based on carbon dots (CDs) co-doped with nitrogen and sulfur atoms has been fabricated using calix[4]arene and benzothiazole moieties for the recognition of toxic mercuric ions (Hg2+) in aqueous medium and the application has been established in Tris–HCl buffer solution, real water samples, and the trapping of Hg2+ ions from aqueous medium. It was observed that the fluorescence intensity of the as-synthesized CDs could be entirely quenched in the presence of Hg2+ ions due to the electron/energy transfer process between the surface functional groups of the CDs and soft closed-shell Hg2+ ions. The proposed nanosensor could proficiently detect Hg2+ ions in aqueous medium with a detection limit of the order of 7.89 nM with high selectivity, sensitivity, and with a relatively low background interference even in a complex medium. The CDs were then further adsorbed on the surface of silica and were investigated for their ability to trap/capture Hg2+ ions using chromogenic and atomic absorption spectroscopy (AAS) method.

Graphical abstract: Nitrogen and sulfur co-doped fluorescent carbon dots for the trapping of Hg(ii) ions from water

Supplementary files

Article information

Article type
Paper
Submitted
24 6 2020
Accepted
21 10 2020
First published
24 10 2020
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2020,1, 3009-3021

Nitrogen and sulfur co-doped fluorescent carbon dots for the trapping of Hg(II) ions from water

H. Kaur, N. Kaur and N. Singh, Mater. Adv., 2020, 1, 3009 DOI: 10.1039/D0MA00448K

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