Jump to main content
Jump to site search

Issue 33, 2019
Previous Article Next Article

Improvement of selectivity via the surface modification of carbon nanodots towards the quantitative detection of mercury ions

Author affiliations

Abstract

Highly fluorescent carbon nanodots are promising fluorophores for biochemical, pharmaceutical, and environmental analysis due to their facile preparation, biocompatibility, tunability, and low-cost precursors. The selectivity improvements towards an environmentally interesting analyte are challenging in analytical chemistry. Herein, a surface modification using a mixed solvent was used to prepare fluorescent carbon dots (CDs) as selective fluorophores for the detection of mercury ions (Hg2+). The solvothermal method was used for the fabrication of 4–6 nm CDs using xylose as a carbon precursor and ethanol–H2O as a mixed solvent. Moreover, optical, morphological, and surface characterizations were thoroughly conducted. The fluorescence emission of the CDs was selectively quenched after the addition of mercury ions and restored by the addition of cysteine. The CDs were successfully used for the quantitative detection of Hg2+ ions without interferences. The fabricated nanoprobe exhibited the good linearity range of 50–800 nM (R2 = 0.9947), and a low detection limit down to 10 nM for Hg2+ was calculated. The selectivity experiments showed that the fluorescent probe was specific for Hg2+ even in the presence of interferences. The CDs were stable under rigorous conditions such as extreme ionic strength and low and high pH values. In addition, the CDs were photo- and thermostable; this made the CDs a promising fluorophore for the fabrication of a rugged and robust nanoprobe towards the detection of Hg2+. The Hg2+ ions in tap and wastewater were determined quantitatively with statistically good spike recoveries and standard deviations.

Graphical abstract: Improvement of selectivity via the surface modification of carbon nanodots towards the quantitative detection of mercury ions

Back to tab navigation

Publication details

The article was received on 12 Jun 2019, accepted on 10 Jul 2019 and first published on 11 Jul 2019


Article type: Paper
DOI: 10.1039/C9NJ03057C
New J. Chem., 2019,43, 12979-12986

  •   Request permissions

    Improvement of selectivity via the surface modification of carbon nanodots towards the quantitative detection of mercury ions

    K. M. Omer, K. H. Hama Aziz and S. J. Mohammed, New J. Chem., 2019, 43, 12979
    DOI: 10.1039/C9NJ03057C

Search articles by author

Spotlight

Advertisements