聚乙烯亚胺包覆的CdZnTe量子点荧光探针测定痕量Pb<sup>2+</sup>

陈燕清; 谢宇

doi:doi:10.3964/j.issn.1000-0593(2016)04-1017-04

光谱学与光谱分析, 2016, 36 (4): 1017, 网络出版: 2016-12-20

聚乙烯亚胺包覆的CdZnTe量子点荧光探针测定痕量Pb²⁺

Detection of Trace Lead (Ⅱ) with CdZnTe Quantum Dots Capped with Polyethyleneimine as A Fluorescence Probe

论文大纲

陈燕清 ^*谢宇

作者单位

江西省生态诊断修复与污染阻断重点实验室, 南昌航空大学环境与化学工程学院, 江西　南昌 330063

Pb2+检测荧光检测 PEI-CdZnTe量子点 Pb2+ detection Fluorescence detection PEI-CdZnTe quantum dots

摘要

在水相中制备了聚乙烯亚胺(PEI)包裹的水溶性PEI-CdZnTe量子点。研究了反应时间, 酸度及不同常见金属离子对PEI-CdZnTe量子点荧光效率的影响。基于Pb2+对 CdZnTe量子点具有选择性荧光猝灭作用, 建立了用CdZnTe量子点为探针灵敏测定痕量Pb2+的新方法。研究了不同浓度Pb2+对CdZnTe量子点荧光强度猝灭情况, 结果表明, Pb2+对CdZnTe量子点的荧光猝灭过程可以很好地用Stern-Volmer荧光猝灭方程来描述。当Pb2+浓度在0.05～3.0 μg·mL-1范围内, CdZnTe量子点的荧光强度F0/F与Pb2+浓度之间具有较好的线性关系, 线性相关系数为0.998 8, 检测限为0.01　μg·mL-1。该量子点荧光分析方法简便快速、灵敏度高、选择性好, 能够应用于实际水样中Pb2+的分析与测定。

Abstract

Water-soluble CdZnTe quantum dots (QDs) were firstly synthesized by using 3-mercaptopropionic acid (MPA) as modifier in aqueous phase. Then, CdZnTe quantum dots were capped with polyethyleneimine (PEI) with electrostatic interaction and condensation reaction between carboxyl group on the surface of QDs and amino group of PEI, and several metal ions were tested to check if they affect the fluorescence properties of CdZnTe QDs in the paper. A novel method to detect trace Pb2+ has been developed based on the selective fluorescence quenching Pb2+ to PEI-CdZnTe QDs. Fluorescence quenching effect of PEI-CdZnTe QDs had been studied by increasing the Pb2+ concentration. The study results show that fluorescence quenching process of Pb2+ can be described well by Stern-Volmer fluorescence quenching equation. There is a good linear relationship between the fluorescence intensity F0/F and the concentration of Pb2+ when the concentration of Pb2+ is in the ranges of 0.05~3.0 μg·mL-1. The linear correlation coefficient and the detection limits are 0.998 8 and 0.01 μg·mL-1, respectively. The proposed fluorescence method of detection is simple, rapid and sensitive, which has been successfully applied to the detection of Pb2+ in tap water.

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陈燕清, 谢宇. 聚乙烯亚胺包覆的CdZnTe量子点荧光探针测定痕量Pb²⁺[J]. 光谱学与光谱分析, 2016, 36(4): 1017. CHEN Yan-qing, XIE Yu. Detection of Trace Lead (Ⅱ) with CdZnTe Quantum Dots Capped with Polyethyleneimine as A Fluorescence Probe[J]. Spectroscopy and Spectral Analysis, 2016, 36(4): 1017.

聚乙烯亚胺包覆的CdZnTe量子点荧光探针测定痕量Pb²⁺

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