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
韩 雍,博士,教授,研究方向:食品安全控制,E-mail:hy0850@qq.com
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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.
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。
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.
碳点比率荧光可视化检测银离子水
carbon dotsratiometric fluorescentvisual detectionsilver ionswater
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