College of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, PR China.
College of Chemical and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, PR China.
J Nanosci Nanotechnol. 2020 Apr 1;20(4):2045-2054. doi: 10.1166/jnn.2020.17374.
In this work, green-emission carbon dots (CDs) were prepared for detecting mercury ions (Hg(II)) and iodine ions via a facile hydrothermal method using ethylenediamine and methyl red as nitrogen and carbon sources, respectively, without any other complex reagents. The bacteriostasis experiment showed that the CDs were not toxic to the growth of four kinds of bacteria: , which indicated that the CDs had good security and could be used for analysis and detection. The CDs exhibited excitation-independent emission, the fluorescence of which could be quenched by Hg(II), and could be recovered by iodine ions. An approach was established to detect Hg(II) based on the fluorescence quenching of CDs by the synergistic action of a photo induced electron transfer (PET) mechanism, and iodine ions were detected based on the fluorescence recovery of CDs by a HgI₂ precipitate formation mechanism. The detection limits for Hg(II) and iodine reached 0.89 M and 0.50 M, respectively. Compared to most methods, the method mentioned in this paper has good selectivity, a wider linear range, a lower detection limit and higher security. The synthesized CDs could be probes for sensing Hg(II) and iodine ions.
在这项工作中，通过简便的水热法，以乙二胺和甲基红分别作为氮源和碳源，制备了用于检测汞离子（Hg(II)）和碘离子的绿色发射碳点（CDs），无需任何其他复杂试剂。抑菌实验表明，CDs 对 4 种细菌的生长没有毒性： ，这表明 CDs 具有良好的安全性，可用于分析和检测。CDs 表现出激发独立的发射，其荧光可以被 Hg(II)猝灭，并且可以通过碘离子恢复。基于光诱导电子转移（PET）机制，通过 CDs 的荧光猝灭建立了一种检测 Hg(II)的方法，并基于 HgI₂沉淀形成机制通过 CDs 的荧光恢复检测碘离子。Hg(II)和碘的检测限分别达到 0.89 M 和 0.50 M。与大多数方法相比，本文所述的方法具有良好的选择性、更宽的线性范围、更低的检测限和更高的安全性。合成的 CDs 可作为检测 Hg(II)和碘离子的探针。
