[1]刘华东,徐浩轩,李合伟,等.氮硫掺杂碳量子点荧光探针检测 Fe3+ 和 Hg2+[J].郑州大学学报(工学版),2022,43(6):64-69.
 LIU H D,XU H X,LI H W,et al.Detection of Fe3+ and Hg2+ by N and S Doped CDs Fluorescence Probe[J].Journal of Zhengzhou University (Engineering Science),2022,43(6):64-69.
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氮硫掺杂碳量子点荧光探针检测 Fe3+ 和 Hg2+()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
43
期数:
2022年6期
页码:
64-69
栏目:
出版日期:
2022-09-02

文章信息/Info

Title:
Detection of Fe3+ and Hg2+ by N and S Doped CDs Fluorescence Probe
作者:
刘华东 徐浩轩 李合伟 王定标
Author(s):
LIU H D XU H X LI H W et al
文献标志码:
A
摘要:
为了实现水溶液中 Fe3+ 和 Hg2+ 的快速简捷检测,以柠檬酸和硫脲为前驱体,采用一步水热法合成硫、氮共掺杂碳量子点荧光探针。 通过透射电镜、傅里叶红外光谱、X 射线光电子能谱、荧光分光光度计和紫外-可见吸收光谱分析合成碳点的形貌特征及荧光性能。 结果表明:N—S—CDs 的平均粒径为8 nm,分布均匀;表面富有各种官能团,具有良好的水溶性;在紫外灯照射下发出强烈的蓝色荧光,荧光量子产率高达36. 8%;随激发波长增大,N—S—CDs 发射峰荧光强度先增大后减小, 在 440 nm 处荧光强度达到最高,并且其 发射峰随着 激发波长发 生明显红移。 N—S—CDs 对 Fe3+ 和 Hg2+ 具有较高选择性; Fe3+ 浓度在 40 ~ 130 μmol / L,Hg2+ 浓度 4 0 ~ 80 μmol / L,荧光 强度与 2 种离 子呈良好线性关系,线性回归方程 分别为 F0 / F = 0. 021 32cFe3+ + 0. 349 45 和 F0 / F = 0. 186 11cHg2+ - 6. 271 14;最低检出限分别为 1. 4、 0. 16 μmol / L;将 N—S—CDs 用于自来水和湖水的实样分析,可有效检测自来水和湖水中 Fe3+ 和 Hg2+ 。 Fe3+ 的定 量回 收率为 97. 16% ~ 103. 62%, Hg2+ 的定量 回收率为 93. 58% ~ 101. 22%。
Abstract:
In order to realize the rapid and simple detection of Fe* and Hg+ in aqueous solution, sulfur and nitrogen co-doped carbon quantum dots fluorescent probes were synthesized by one-step hydrothermal method using citric acid and thiourea as precursors. The morphology and fluorescence properties of the N-S-CDs were analyzed by transmission electron microscope, Fourier transform infrared spectroscopy, X-ray photoelec- tron spectroscopy, fluorescence spectrophotometer, and ultraviolet-visible absorption spectroscopy. The results showed that the average particle size of N-S-CDs was 8 nm, which was uniformly distributed. The surface was rich in various functional groups and has good water solubility. The strong blue fluorescence was emitted from N-S-CDs under the irradiation of ultraviolet lamp, and the fluorescence quantum yield was as high as 36. 8%. With the increase of excitation wavelength, the fluorescence intensity of N-S-CDs emission peak increased at first and then decreased, and the fluorescence intensity reached the highest at 440 nm, and the e- mission peak was obviously red-shifted with the excitation wavelength. N-S-CDs had high selectivity for Fe* and Hg+. There was a good linear relationship between the fluorescence intensity and the two ions when the concentration of Fe* was in the range of 40-130 umol/L and the concentration of Hg was in the range of 40-80 umol/L. The linear regression equations are Fo/F 0. 021 32c3++ 0. 349 45 and Fo/F= 0. 186 11c2+-6. 271 14, and the lowest detection limits were 1. 4 umol/L and 0. 16 umol/L, respectively. The application of N-S-CDs to the real sample analysis of tap water and lake water could effectively detect Fe and Hg. The quantitative recovery of Fe was between 97. 16% and 103. 62%, and that of Hg was between 93. 58% and 101. 22%.
更新日期/Last Update: 2022-10-03