Abstract Carbon quantum dots (CQDs), as a new carbonaceous nanomaterial, have attracted considerable attention due to their excellent properties. In this work, eggshell membrane (ESM), an excellent carbon source that is very easy to obtain, was used to synthesize water-soluble and fluorescent CQDs with a rapid, environmentally friendly and waste-recycling hydrothermal method. The synthesized functionalized CQDs showed superior water dispersibility and stability with a maximum fluorescence emission peak at 420 nm. The fluorescence quantum yield was approximately 9.6% under the selected synthesis conditions. A new label-free fluorescent method for the selective determination of Hg2+ was developed with a detection limit of 2.6 μM using the inhibition of the CQDs fluorescence by the ions. The linear range of the detection is from 10 to 100 μM. The prepared CQDs have also been successfully applied to the determination of Hg2+ in water samples.

中文翻译：

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蛋壳膜合成绿色碳量子点荧光测定汞(II)

摘要 碳量子点（CQDs）作为一种新型的碳质纳米材料，以其优异的性能引起了广泛的关注。在这项工作中，蛋壳膜（ESM）是一种非常容易获得的优质碳源，被用于通过快速、环保和废物回收的水热法合成水溶性和荧光 CQD。合成的功能化 CQD 显示出优异的水分散性和稳定性，最大​​荧光发射峰位于 420 nm。在选定的合成条件下，荧光量子产率约为 9.6%。利用离子对 CQDs 荧光的抑制，开发了一种用于选择性测定 Hg2+ 的新的无标记荧光方法，检测限为 2.6 μM。检测的线性范围为 10 至 100 μM。