一种荧光探针检测水溶液中碘离子

doi:10.7517/issn.1674-0475.201006

影像科学与光化学 ›› 2021, Vol. 39 ›› Issue (3): 354-358.DOI: 10.7517/issn.1674-0475.201006

一种荧光探针检测水溶液中碘离子

刘炉英¹, 范远东¹, 王静², 王静珊¹, 谢浩源¹, 谢丽君¹

1. 广东第二师范学院化学系, 广东广州 510303;
2. 中山大学孙逸仙纪念医院, 广东广州 510120

收稿日期:2020-10-13 出版日期:2021-05-15 发布日期:2021-05-17
通讯作者: 谢丽君
基金资助:
广东省青年创新人才项目（2018KQNCX178，2017KQNCX143）、广东省大学生创新实验项目（S201914278031）、广东省基础与应用基础研究基金项目（2020A1515010788）资助

A Fluorescent Probe for Detecting the Iodide Ion in Aqueous Solution

LIU Luying¹, FAN Yuandong¹, WANG Jing², WANG Jingshan¹, XIE Haoyuan¹, XIE Lijun¹

1. Department of Chemistry, Guangdong University of Education, Guangzhou 510303, Guangdong, P. R. China;
2. Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510120, Guangdong, P. R. China

Received:2020-10-13 Online:2021-05-15 Published:2021-05-17

摘要/Abstract

摘要： 本文选用无水柠檬酸和N-（β-氨乙基-γ-氨丙基）甲基二甲氧基硅烷，利用水热法制得碳量子点，此碳量子点发蓝光，激发波长和发射波长分别为370 nm、466 nm。由于碘的重原子效应和碘离子易于给出电子的能力，当碳量子点在水溶液中遇到碘离子时会发生荧光猝灭，通过测量荧光寿命，发现碳量子点和碘离子之间存在动态猝灭效应。利用这一特性，建立一种选择性检测水溶液中碘离子的荧光探针。优化分散溶剂对碳量子点荧光强度的影响，以及响应时间和溶液pH值对猝灭效率的影响。在最优实验条件下：荧光变化值（F₀-F）与碘离子浓度的对数呈线性，线性方程为Y=427.60X+646.88，R²=0.9945，碘离子浓度的线性范围为5×10^-7~5×10^-4 mol/L，检出限为3.2×10^-8 mol/L。选用三个浓度加标检测自来水样时，回收率范围为101%~105%。

关键词: 碳量子点, 碘离子, 重原子效应, 动态猝灭效应, 荧光探针

Abstract: In this paper, anhydrous citric acid and N-(β-aminoethyl-γ-aminopropyl) methyldimethoxysilane were used to prepare carbon quantum dots by hydrothermal method. The carbon quantum dot emits blue light, and the excitation wavelength and emission wavelength were 370 nm and 466 nm, respectively. Due to the heavy atom effect of iodine and the ability of iodine ions to easily donate electrons, fluorescence quenching occurs when carbon quantum dots encounter iodide ions in an aqueous solution. By measuring the fluorescence lifetime, it was found that there was a dynamic quenching effect between carbon quantum dots and iodide ions. Using this feature, a fluorescent probe for selective detection of iodide ions in aqueous solution was established. Optimize the influence of the dispersion solvent on the fluorescence intensity of carbon quantum dots, and the influence of response time and pH on the quenching efficiency. Under the optimal experimental conditions:the fluorescence change value (F₀-F) with the logarithm of iodide ion concentration was linear, the linear equation was Y=427.60X+646.88, R²=0.9945, and the linear range was 5×10^-7-5×10^-4 mol/L, the detection limit was 3.2×10^-8 mol/L. The recovery range was 101%-105% when three concentrations spiked were used to test the water samples.

Key words: carbon quantum dots, iodine ion, heavy atom effect, dynamic quenching effect, fluorescent probe

刘炉英, 范远东, 王静, 王静珊, 谢浩源, 谢丽君. 一种荧光探针检测水溶液中碘离子[J]. 影像科学与光化学, 2021, 39(3): 354-358.

LIU Luying, FAN Yuandong, WANG Jing, WANG Jingshan, XIE Haoyuan, XIE Lijun. A Fluorescent Probe for Detecting the Iodide Ion in Aqueous Solution[J]. IMAGING SCIENCE AND PHOTOCHEMISTRY, 2021, 39(3): 354-358.

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一种荧光探针检测水溶液中碘离子

A Fluorescent Probe for Detecting the Iodide Ion in Aqueous Solution

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