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 Jūn. 2020
Accepted
21 Okt. 2020
First published
24 Okt. 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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