Facile and efficient fabrication of g-C3N4 quantum dots for fluorescent analysis of trace copper(II) in environmental samples |
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Authors: | Qin Liu Debin Zhu Manli Guo Ying Yu Yujuan Cao |
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Affiliation: | School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China |
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Abstract: | The facile preparation of g-C3N4 QDs with high fluorescent performance has become an important direction in the last decade. Herein, we develop a facile, rapid approach to synthesize highly fluorescent QDs based on recrystallization and ultrasonic exfoliation. Size-controllable graphitic carbon nitride (gC3N4) QDs can be obtained from the precursor of recrystallized dicyandiamide, only 90 min is needed and the size of QDs is adjusted from 5 nm to 200 nm by controlling the ultrasonic time. Moreover, better fluorescent efficiency is also obtained comparing to traditional g-C3N4 QDs. The obtained g-C3N4 QDs responds to Cu(Ⅱ) in the 0.5 nmol/L to 30 μmol/L concentration range, with a 0.3 nmol/L detection limit. The method was applied to the determination of Cu(Ⅱ) in different environmental water samples. |
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Keywords: | Graphitic carbon nitride Quantum dots Recrystallized Fluorescent analysis Copper(II) |
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