Abstract
An ecofriendly microwave pyrolysis tactic was employed to synthesize N-doped fluorescent carbon nanodots (N-CNDs) using Gum ghatti and ethylenediamine as a carbon and nitrogen source. The fabricated N-CNDs exhibits high stability in water medium and emits bright blue fluorescence with the quantum yield of 23%. We further established N-CNDs as an excellent visual and selective fluorescent-based nanoprobe for mercury ions (Hg2+ ions) detection. The limit of detection was found to be 4.6 nM. When metal ion chelator ethylenediaminetetraacetic acid (EDTA) was added into the N-CNDs + Hg2+ ions system, the fluorescence was reverted effectively. Moreover, the fluorescent quenching principle of N-CNDs + Hg2+ ions system follows the static quenching mechanism. Finally, the Gum ghatti derived N-CNDs was efficiently applied in environmental water samples like tap and mineral water to determine mercury ions.
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