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The present article reports on a simple, economical, and green preparative strategy toward water-soluble, fluorescent carbon nanopartides (CPs) with a quantum yield of approximately 6.9% by hydrothermal process using low cost wastes of pomelo peel as a carbon source for the first time. We further explore the use of such CPs as probes for a fluorescent Hg2+ detection application, which is based on Hg2+- induced fluorescence quenching of CPs. This sensing system exhibits excellent sensitivity and selectivity toward Hg2+, and a detection limit as low as 0.23 nM is achieved. The practical use of this system for Hg2+ determination in lake water samples is also demonstrated successfully. [ABSTRACT FROM AUTHOR]

A highly efficient fluorosensor based on ultrathin graphitic carbon nitride (g-C3N4) nanosheets for Cu2+ was developed. In the absence of metal ions, the nanosheets exhibit high fluorescence; the strong coordination of the Lewis basic sites on them to metal ions, however, causes fluorescence quenching via photoinduced electron transfer leading to the qualitative and semiquantitative detection of metal ions. This fluorosensor exhibits high selectivity toward Cu2+. The whole detection process can be completed within 10 min with a detection limit as low as 0.5 nM. The use of test paper enables the naked-eye detection of Cu2+ with a detection limit of 0.1 nmol. The practical use of this sensor for Cu2+ determination in real water samples was also demonstrated. [ABSTRACT FROM AUTHOR]