Detection of Silver Ions in Water by Dual Carbon Dots Based on Visualization-assisted Ratiometric Fluorescent

HAN Yong; MA Yan-xin; WANG Hui; WANG Ya

doi:10.19969/j.fxcsxb.23070404

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Detection of Silver Ions in Water by Dual Carbon Dots Based on Visualization-assisted Ratiometric Fluorescent

Experimental Techniques and Methods | 更新时间：2023-12-25

- Detection of Silver Ions in Water by Dual Carbon Dots Based on Visualization-assisted Ratiometric Fluorescent
- Journal of Instrumental Analysis Vol. 42, Issue 12, Pages: 1623-1630(2023)
- 作者机构：
  
  1.陇东学院农林科技学院，甘肃庆阳 745000
  2.兰州理工大学生命科学与工程学院，甘肃兰州 730050
- 作者简介：
- 基金信息：
- DOI：10.19969/j.fxcsxb.23070404
  CLC：
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韩雍,马艳鑫,汪慧等.可视化辅助双碳点比率荧光检测水中银离子[J].分析测试学报,2023,42(12):1623-1630.

HAN Yong,MA Yan-xin,WANG Hui,et al.Detection of Silver Ions in Water by Dual Carbon Dots Based on Visualization-assisted Ratiometric Fluorescent[J].Journal of Instrumental Analysis,2023,42(12):1623-1630.
韩雍,马艳鑫,汪慧等.可视化辅助双碳点比率荧光检测水中银离子[J].分析测试学报,2023,42(12):1623-1630. DOI： 10.19969/j.fxcsxb.23070404.

HAN Yong,MA Yan-xin,WANG Hui,et al.Detection of Silver Ions in Water by Dual Carbon Dots Based on Visualization-assisted Ratiometric Fluorescent[J].Journal of Instrumental Analysis,2023,42(12):1623-1630. DOI： 10.19969/j.fxcsxb.23070404.

摘要

该文以柠檬酸、,L,-半胱氨酸（,L,-Cys）和邻苯二胺（OPD）为前体通过一步水热法分别合成了蓝光碳点（B-CDs）与黄光碳点（Y-CDs），将两者杂化形成双碳点（d-CDs），并基于该d-CDs构建了快速检测环境水样中Ag,+,的可视化比率荧光传感器。采用透射电子显微镜、红外光谱、X射线光电子能谱、紫外吸收光谱、荧光光谱对d-CDs的结构和光学性能进行表征。考察了pH值、反应温度、孵育时间等因素对传感器检测效果的影响并进行了优化。d-CDs呈球形，分散性好且分布均匀，平均粒径为2.14 nm，含有巯基和芳香环结构，并存在大量的羟基和羧基基团。Ag,+,能与d-CDs表面的官能团发生官能团配位形成d-CDs/Ag,+,复合物，并可通过光致能量转移（PET）猝灭d-CDs的蓝色荧光。另外Ag,+,能够与d-CDs含有的巯基结合产生絮凝物。随着蓝色荧光的减弱，体系呈现出黄色荧光增强的现象。该传感器在Ag,+,浓度0~40 µmol/L范围内呈良好的线性响应，相关系数（,r,2,）为0.996 7，检出限（LOD）为1.26 μmol/L，加标回收率为98.2%~105%，相对标准偏差（RSD）为0.49%~3.8%。该方法具有快速、简便、灵敏度和可靠性高的优势，并可实现环境水样中Ag,+,的可视化半定量检测。

Abstract

In this work，blue carbon dots（B-CDs） and yellow carbon dots（Y-CDs） were synthesized through a hydrothermal method using citric acid，,L,-cysteine（,L,-Cys） and ,o,-phenylenediamine（OPD） as precursors respectively，then hybridized dual carbon dots to form a visual ratiometric fluorescent sensor（d-CDs） for the rapid detection of Ag,+, in environmental water samples. The structural and optical properties of d-CDs were characterized using transmission electron microscope（TEM），Fourier transform infrared（FTIR），X-ray photoelectron spectroscopy（XPS），X-ray diffraction（XRD），ultraviolet absorption spectroscopy and fluorescence spectroscopy. The effects of pH，reaction temperature and incubation time of the sensor were investigated and optimized. The d-CDs are spherical with an average particle size of 2.14 nm，which were well dispersed and uniformly distributed in the solution. The d-CDs contain mercapto and aromatic ring structures and a large number of hydroxyl and carboxyl groups，which can induce d-CDs/Ag,+ ,complexes in the presence of Ag,+, and quenched the blue fluorescence of d-CDs by photoinduced energy transfer（PET）. As the blue fluorescence decreases，yellow fluorescence significant increases in the ratiometric fluorescent system. The sensor showed good linear response in the range of Ag,+, concentration 0-40 µmol/L with the ,r,2, of 0.996 7 and the limit of detection（LOD） of 1.26 µmol/L. The spiked recoveries were 98.2%-105% with the relative standard deviations of 0.49%-3.8% in practical test. The method is rapid，simple，sensitive and reliable，and can realize the visual semi-quantitative detection of Ag,+, in environmental water samples.

关键词

碳点比率荧光可视化检测银离子水

Keywords

carbon dotsratiometric fluorescentvisual detectionsilver ionswater

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School of Chemistry and Chemical Engineering，Henan University of Technology

State Key Laboratory of Supramolecular Structure and Materials，College of Chemistry，Jilin University

Center for Supramolecular Chemical Biology，College of Chemistry， Jilin University Changchun

Institute of Theoretical Chemistry，College of Chemistry，Jilin University

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