数字农科院2.0

Ratiometric Fluorescent Sensor for Hg2+ and Thiophanate-Methyl Based on Nitrogen-Doped Carbon Dots and Rhodamine B

文献类型： 外文期刊

作者： Zhang, Changsheng;Liang, Shuang;Liu, Haijun;Hu, Yuxuan;Zhang, Xinzhong;Luo, Fengjian;Lou, Zhengyun;Zhou, Li;Yang, Mei

作者机构：

关键词： carbon dots;Rhodamine B;fluorescent sensor;Hg2+;thiophanate-methyl

期刊名称： JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

ISSN： 0021-8561

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Mercury (Hg2+) and thiophanate-methyl (TM) are recognized as widespread pollutants in the environment and food. Here, a novel ratiometric fluorescent sensor has been developed for the detection of Hg(2+)and TM using nitrogen-doped carbon dots (N-CDs) and Rhodamine B (RhB). In the presence of Hg2+, the fluorescence quenching of N-CDs was caused by photoinduced electron transfer, while the fluorescence recovery was triggered by the competitive binding of TM and N-CDs to Hg2+. However, the RhB fluorescence in the system was unaffected byHg(2+) and acted as a reference for internal calibration. Under optimized conditions, the sensor displayed a favorable linear dependence on Hg(2+)and TM within the concentration ranges of 0.50-50 mu M and 0.50-3.0 mg/L, with detection limits of 0.15 mu M and 0.017 mg/L, respectively. And the sensor exhibited remarkable selectivity, with insignificant interference from coexisting metal ions or pesticides. This work presents a novel dual-functional ratiometric sensor for cascade detection of Hg2+ and TM in diverse environments, such as water, cucumber, and rice, highlighting its potential in practical applications.

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