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Determination of S2- in Environmental Water Samples Using Dual-emission CQDs as Ratio Fluorescent Probe
增强出版- Chinese Journal of Luminescence Vol. 44, Issue 4, Pages: 729-737(2023)
- 作者机构：
1.延安大学 化学与化工学院， 延安市分析技术与检测重点实验室， 陕西 延安 716000
2.中材地质工程勘查研究院有限公司， 北京 100102
3.延安大学 医学院， 陕西 延安 716000
- 作者简介：
- 基金信息：National Natural Science Foundation of China(22264023);Scientific Research Projects of Education Department of Shaanxi Provincial Government(22JK0614);PhD Start⁃up Fund of Yan'an University(YDBK2022⁃15;YDBK2020⁃30);Health Research Project of Shaanxi Province(2022E019)
DOI：10.37188/CJL.20220339
CLC： O657.3Published：05 April 2023，
Received：22 September 2022，
Revised：11 October 2022，
扫 描 看 全 文
张越诚,王清清,马静等.环境水样中S2-的CQDs双发射比率荧光测定[J].发光学报,2023,44(04):729-737.
ZHANG Yuecheng,WANG Qingqing,MA Jing,et al.Determination of S2- in Environmental Water Samples Using Dual-emission CQDs as Ratio Fluorescent Probe[J].Chinese Journal of Luminescence,2023,44(04):729-737.
张越诚,王清清,马静等.环境水样中S2-的CQDs双发射比率荧光测定[J].发光学报,2023,44(04):729-737. DOI： 10.37188/CJL.20220339.
ZHANG Yuecheng,WANG Qingqing,MA Jing,et al.Determination of S2- in Environmental Water Samples Using Dual-emission CQDs as Ratio Fluorescent Probe[J].Chinese Journal of Luminescence,2023,44(04):729-737. DOI： 10.37188/CJL.20220339.
摘要
以葡萄糖为碳源、对苯二胺为氮源，一步水热法合成了新型双发射荧光碳量子点（GP⁃CQDs），对该GP⁃CQDs的形貌及光谱特性进行了研究。实验发现，在单一波长
λ
ex
=300 nm激发下，该GP⁃CQDs于348 nm和452 nm处有双发射荧光信号。将MnO
4
-
加入GP⁃CQDs溶液，GP⁃CQDs于452 nm处的荧光信号完全猝灭，而348 nm处的信号基本不变。于上述猝灭体系中继续加入S
2-
，其于425 nm处产生新的荧光发射峰，相较于GP⁃CQDs原452 nm处的荧光信号，发射峰位置发生蓝移，且发射峰强度随S
2-
的浓度增加线性增强，而348 nm处的信号无增敏现象。根据该现象，以425 nm处的荧光峰为响应信号、348 nm荧光峰为参比信号，可直接构建基于S
2-
测定的比率荧光传感探针。实验对该探针的构建条件及分析性能进行了优化，当S
2-
浓度在3.1×10
-8
~ 8.0×10
-6
mol/L范围内时，与348 nm和425 nm两处的荧光强度比值（
I
425
/
I
348
）呈现良好的线性关系，检出限为9.41×10
-9
mol/L（3
σ
/
k
）。对MnO
4
-
及S
2-
与GP⁃CQDs的作用机理进行了探讨。该方法简单、快速、灵敏度高，用于环境水样中S
2-
的测定，结果满意。
Abstract
Dual-emission fluorescence carbon quantum dots （GP-CQDs） were synthesized by a one-step hydrothermal method using glucose and p-phenylenediamine as carbon sources. The morphology and spectral properties of GP-CQDs were studied. It was found that the GP-CQDs have dual emission fluorescence signals at 348 nm and 452 nm under a single excitation wavelength at 300 nm. When MnO
4
-
was added to the GP-CQDs solution， the fluorescence signal of GP-CQDs at 452 nm was completely quenched； however， the signals at 348 nm kept stable. When S
2-
was added to the quenching system above， a new fluorescence emission peak was generated at 425 nm. Compared with the original fluorescence peak at 452 nm， the peak was blue-shifted， and the fluorescence intensity at 425 nm was linearly enhanced with the S
2-
concentration. With the fluorescence peak at 425 nm as the response signal and the 348 nm fluorescence peak as the reference signal， a ratiometric fluorescence sensing probe for S
2-
determination can be directly constructed. Under the optimal condition， this method showed a good linear relationship in the range of 3.1×10
-8
-8.0×10
-6
mol/L and the detection limit was calculated to be 9.41×10
-9
mol/L（3
σ
/
k
）. The basic mechanism of the proposed method was further discussed. Moreover， this method can be applied to detect S
2-
in environmental water samples with satisfactory results.
关键词
硫离子（S2-）双发射荧光碳量子点比率荧光传感器
Keywords
sulfur iondual-emission carbon quantum dotsratio fluorescence probe
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