Nitrogen- and Sulfur-Codoped Carbon Dots for Highly Selective and Sensitive Fluorescent Detection of Hg2+ Ions and Sulfide in Environmental Water Samples

Journal of Agricultural and Food Chemistry
Huifang Wu, Changlun Tong

Abstract

Nitrogen- and sulfur-codoped carbon dots (N,S-CDs) with a fluorescence quantum yield of 16.1% and good photoluminescent properties were synthesized by a simple hydrothermal method. Cytotoxicity of the N,S-CDs was evaluated by the MTT assay, and human hepatoma HepG2 cells were chosen as the target. The cell viability was more than 85% after 24 h of incubation when its concentration was up to 300 μg/mL, suggesting low cytotoxicity and good biocompatibility of the N,S-CDs. The fluorescence spectra of the N,S-CDs are excitation-dependent in the excitation-wavelength range of 295-400 nm, and it emits bright blue fluorescence centered at 435 nm. Its selective fluorescence recognition for Hg2+ ions was found. When Hg2+ ions were added to the N,S-CDs solution, its bright blue fluorescence was obviously quenched and could be recovered by the addition of sulfide. Accordingly, a new strategy based on N,S-CDs-Hg2+ system as a highly selective and ultrasensitive "turn off-on" fluorescence sensing for the detection of sulfide was fabricated. The limits of detection (S/N = 3) are 83 nM for Hg2+ ions and 11 nM for sulfide. Almost no statistically significant interference for Hg2+-ion and sulfide detection was observed among possible coexisting...Continue Reading

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Citations

Nov 5, 2019·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Yanxiu GuoWansong Zong
Jul 22, 2020·Journal of Fluorescence·Faezeh AskariJohn F Trant
Dec 31, 2019·Journal of Analytical Methods in Chemistry·Qianchun ZhangYafei Chen
Dec 11, 2020·Luminescence : the Journal of Biological and Chemical Luminescence·Xiaoliang HaoZhigang Fang
Mar 3, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Anzhong TanXuejuan Wan
Mar 10, 2021·Luminescence : the Journal of Biological and Chemical Luminescence·Zahra Abolghasemi-FakhriMohammad Amjadi
May 28, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Linlin WangSeung Hyun Hur
Jun 17, 2021·Journal of Agricultural and Food Chemistry·Xiaoqian XieShuo Wang

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