碳量子点作为一种新型的碳纳米材料，具有独特的光学与电学性质，具有良好的水溶性与生物兼容性以及低细胞毒性，而且制备简单，价格低廉，已引起了研究者的广泛关注。本项目拟以有毒有害重金属离子（Hg2+、Cd2+、Pb2+、Cr3+、As3+等）作为研究对象，通过对合成的碳量子点表面进行修饰或自组装对重金属离子具有特异性识别的有机分子、核酸适配子或离子印迹聚合物，构建高灵敏度、高选择性的碳量子点荧光探针用于地表或地下水中痕量的有毒有害重金属离子的简便快速检测，同时尝试将构建的碳量子点荧光探针应用于便携式荧光微型光纤光谱仪，实现水样中痕量重金属离子的快速、在线检测，满足地表或地下水中痕量重金属离子在线或现场应急检测的需求。

Carbon quantum dots as a new type carbon nanoparticles are particularly encouraging owing to their outstanding optical and electronic properties, good water-solubility and biocompatibility, low toxicity, easily preparation, and lower costs. Toxic heavy metal ions such as Hg2+、Cd2+、Pb2+、Cr3+、As3+ are acted as the research objects in this proposal. Based on the prepared carbon quantum dots are conducted by modification or self-assembly on their surface using orgnic molecules, aptamers and ion imprinted polymer with specific recognition on heavy metal ions, carbon quantum dots as fluorescent probes for sensitive and selective detection of heavy metal ions in surface or underground water are developed. Meanwhile, we try to accomplish rapid and online monitoring the trace heavy metal ions in water samples by combining the handy miniature fiber optical spectrometer with the prepared fluorescence probes-based carbon quantum dots, in order to meet the demand of the online monitoring or emergency monitoring of trace heavy metal ions in surface or underground water.