Kumari Pooja, Singh Prabhakar, Kumar Amit, Kumar Ashok, Kumari Archana
Department of Chemistry, Sahjanand Brahmarshi College, Veer Kunwar Singh University, Arrah, Bihar, 802301, India.
Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, Uttar Pradesh, India.
J Fluoresc. 2025 Sep 17. doi: 10.1007/s10895-025-04553-y.
Heavy metal ion pollutants pose serious threats to human health and the environment due to their toxicity. An intuitive and convenient technique for detecting heavy metal ions is vital for qualitative monitoring and food safety. In this work, carbon dots (L-CDs) are prepared from a green source (lemon leaves) using a hydrothermal process, yielding a quantum of approximately 12.4%. These L-CDs exhibited excellent selectivity and sensitivity towards Hg ions, with a limit of detection (LOD) of 0.23 nM and a wide linear range of 0-8 nM. This detection system may follow a dynamic quenching mechanism, characterized by fluorescent lifetime decay and zeta potential analysis. In addition, it was applied to detect Hg ions in real water samples (coal water and industrial water), with recovery rates ranging from 98 to 102%, and relative standard deviations were 0.2-0.6%. Furthermore, the low cytotoxicity and small particle size of the L-CDs also make them suitable for use in antioxidant activity as well as HeLa cell imaging. Overall, this research represents a promising candidate in the field of environmental monitoring, food safety, and biomedical research.
重金属离子污染物因其毒性对人类健康和环境构成严重威胁。一种直观便捷的重金属离子检测技术对于定性监测和食品安全至关重要。在这项工作中，采用水热法从绿色来源（柠檬叶）制备了碳点（L-CDs），产率约为12.4%。这些L-CDs对汞离子表现出优异的选择性和灵敏度，检测限（LOD）为0.23 nM，线性范围为0-8 nM。该检测系统可能遵循动态猝灭机制，通过荧光寿命衰减和zeta电位分析来表征。此外，它被应用于实际水样（煤水和工业水）中汞离子的检测，回收率在98%至102%之间，相对标准偏差为0.2-0.6%。此外，L-CDs的低细胞毒性和小粒径也使其适用于抗氧化活性以及HeLa细胞成像。总体而言，这项研究在环境监测、食品安全和生物医学研究领域具有广阔的应用前景。
