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基于汞修饰的石墨烯量子点，利用SO和HO作为新型特异性掩蔽剂对CN和I进行高选择性“开启”荧光开关识别。

The use of SO and HO as novel specific masking agents for highly selective "turn-on" fluorescent switching recognition of CN and I based on Hg-graphene quantum dots.

作者信息

Nuengmatcha Prawit, Sricharoen Phitchan, Limchoowong Nunticha, Mahachai Ratana, Chanthai Saksit

机构信息

Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand

出版信息

RSC Adv. 2018 Jan 3;8(3):1407-1417. doi: 10.1039/c7ra12327b. eCollection 2018 Jan 2.

DOI:10.1039/c7ra12327b
PMID:35540915
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9077089/
Abstract

In this study, we report that both CN and I can enhance the fluorescent intensity of Hg-graphene quantum dots (Hg-GQDs). However, the selectivity of the sensor was poor. Accordingly, simple specific masking agents can be directly used to solve this problem. Here, for the first time, we report the use of persulfate ion (SO ) as a turn-on fluorescent probe of Hg-GQDs for selective CN detection, while hydrogen peroxide (HO) was selected for its sensing ability towards I ion detection. Interestingly, the signal was immediately measured after addition of the masking agent to Hg-GQDs and the sample because its interaction was very fast and efficient. The method had a linear response in the concentration ranges of 0.5-8 μM ( = 0.9994) and 1-12 μM ( = 0.9998) with detection limits of 0.17 and 0.20 μM for CN and I, respectively. The sensor was successfully used for the dual detection of both CN and I in real water samples with satisfactory results. In conclusion, the specific masking agents in a Hg-GQDs system appeared to be good candidates for fluorometric "turn-on" sensors for CN and I with excellent selectivity over other ions.

摘要

在本研究中，我们报道了氰根离子（CN）和碘离子（I）均可增强汞掺杂石墨烯量子点（Hg-GQDs）的荧光强度。然而，该传感器的选择性较差。因此，简单的特效掩蔽剂可直接用于解决此问题。在此，我们首次报道使用过硫酸根离子（SO）作为Hg-GQDs的开启型荧光探针用于选择性检测CN，同时选择过氧化氢（HO）用于检测I离子。有趣的是，在向Hg-GQDs和样品中加入掩蔽剂后可立即测得信号，因为其相互作用非常快速且高效。该方法在0.5 - 8 μM（ = 0.9994）和1 - 12 μM（ = 0.9998）浓度范围内呈线性响应，CN和I的检测限分别为0.17和0.20 μM。该传感器成功用于实际水样中CN和I的双重检测，结果令人满意。总之，Hg-GQDs体系中的特效掩蔽剂似乎是用于CN和I的荧光“开启”传感器的良好候选物，对其他离子具有优异的选择性。

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