School of Environment, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, China; State Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing, Beijing 102249, China.
School of Environment, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, China.
Sci Total Environ. 2022 Jun 25;827:154357. doi: 10.1016/j.scitotenv.2022.154357. Epub 2022 Mar 5.
A kind of nitrogen doped carbon dots (N-CDs) was facilely fabricated from polyethyleneimine and anhydrous citric acid, and which was adopted to develop a neoteric "on-off" and "off-on" fluorescent sensor for rapidly and efficiently sensing Hg and I. The fluorescence of N-CDs was notably quenched (off) in the existence of Hg derived from strong interaction and the electron transfer between N-CDs and Hg, while the quenched fluorescence of the N-CDs and Hg system was strikingly regained by addition of I (on) resulted from the separation of N-CDs and Hg due to the higher binding preference between Hg and I. Under optimal conditions, the linear detection ranges were 0.01-20 μM for Hg and 0.025-7 μM for I, respectively. Meanwhile, the detection limits could be down to 3.3 nM for Hg and 8.5 nM for I, respectively. Satisfied recoveries had also been gained for measuring Hg and I in practical water samples. The constructed "on-off-on" fluorescent sensor provided a simple, rapid, robust and reliable platform for detecting Hg and I in environmental applications.
一种氮掺杂碳点（N-CDs）是由聚乙烯亚胺和无水柠檬酸简便制备的，并被用于开发一种新颖的“开-关”和“关-开”荧光传感器，用于快速有效地检测 Hg 和 I。在 Hg 的存在下，N-CDs 的荧光显著猝灭（关闭），这是由于 N-CDs 和 Hg 之间的强相互作用和电子转移所致，而当加入 I 时（打开），由于 Hg 和 I 之间更高的结合偏好，N-CDs 和 Hg 会分离，从而使猝灭的 N-CDs 和 Hg 体系的荧光显著恢复。在最佳条件下，Hg 的线性检测范围为 0.01-20 μM，I 的线性检测范围为 0.025-7 μM。同时，Hg 和 I 的检测限分别可低至 3.3 nM 和 8.5 nM。该方法在实际水样中测定 Hg 和 I 时，也获得了令人满意的回收率。所构建的“开-关-开”荧光传感器为环境应用中检测 Hg 和 I 提供了一种简单、快速、稳健和可靠的平台。
