Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8854219 | Ecotoxicology and Environmental Safety | 2018 | 6 Pages |
Abstract
A novel, green, facile and dual turn-off/on sensor for detection of Hg2+ and I- was developed based on carbon dots. Carbon dots were synthesized from citric acid, urea, and thiourea by microwave-assisted method. The size of the carbon dots (CDs) was about 10â¯nm and the synthesized CDs showed a strong emission at 523â¯nm upon excitation at 416â¯nm. The fluorescence quantum yield was 19.2%. Mercury (II) quenched the fluorescence of carbon dots. This turn off sensor had linear response for Hg2+ over a concentration range from 0.1 to 20â¯ÂµM with detection limit as low as 62â¯nM. The carbon dots/Hg2+ system was also used as a turn on sensor for detection of iodide. Linear concentration range for I- was 0.1-10â¯ÂµM with detection limit as low as 72â¯nM. The proposed method showed good sensitivity and selectivity with respect to interference ions. Finally, this system was successfully used for the detection of Hg2+ and I- in tap, river and mineral waters and fish samples.
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Authors
Reza Tabaraki, Negar Sadeghinejad,