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• W4285602372 abstract "Unintended leakage of toxic and radioactive uranyl ion (UO 2 2+ ) ions poses high harmful to human health and environment, hence its monitoring and detection is of utmost significance. Here, we developed a mild synthetic route to prepare stable N-doped carbon nanodots (CDs) with special hydrophilicity functional groups and graphitic N by polymerization and carbonization of novel norfloxacin precursor with nitrogen heterocyclic structure. The morphology, chemical structure, fluorescent properties, sensing competition and selectivity behaviors of CDs-UO 2 2+ were systematically analyzed. Controllable experiments including low and high concentration CDs-UO 2 2+ and another type of carbon dots (TEA-CDs) with low graphitic N amount using triethanolamine (TEA) precursor without nitrogen heterocyclic structure were designed, which further confirmed the effective coordination and interaction mechanism between CDs and UO 2 2+ that graphitic N in CDs induced the formation UO 2 + (V) by electron transfer. It is very suitable for on-site and real-time monitoring of UO 2 2+ with an ultra-fast response time (∼20 s) and low detection limit of 20.38 nM (4.7 μg L −1 ), which is lower than the permissible limits (30 μg L −1 ) defined by the United States Environmental Protection Agency (EPA). More importantly, different form the liquid sensor, solid sensors (printed test strip and hydrogel) were also successfully employed to monitor UO 2 2+ targets quickly, broadening the potential application for the advanced image encryptions. Carbon nanodots (CDs) derived from norfloxacin precursor with nitrogen heterocyclic structure exhibited excellent selectivity and sensitivity for UO 2 2+ detection because graphitic N in CDs induced the formation UO 2 + (V) by electron transfer." @default.
• W4285602372 created "2022-07-16" @default.
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• W4285602372 date "2022-10-01" @default.
• W4285602372 modified "2023-10-17" @default.
• W4285602372 title "Ultra-sensitive and stable N-doped carbon dots for selective detection of uranium through electron transfer induced UO2+(V) sensing mechanism" @default.
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• W4285602372 doi "https://doi.org/10.1016/j.carbon.2022.07.036" @default.
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