双硫腙功能化CdTe量子点的合成及其在铅离子检测中的应用  

Synthesis of Dithizone Functionalized CdTe Quantum Dots and ItsApplication in Lead Ions Detection

作　　者：刘西京 刘红雨[2] 吕继良 周培疆[2] LIU Xijing;LIU Hongyu;LYU Jiliang;ZHOU Peijiang(School of Environmental Science and Engineering,Hubei Polytechnic University,Huangshi Hubei 435003;School of Resource and Environmental Science,Wuhan University,Wuhan Hubei 430079)

机构地区：[1]湖北理工学院环境科学与工程学院,湖北黄石435003 [2]武汉大学资源与环境科学学院,湖北武汉430079

出　　处：《湖北理工学院学报》2020年第6期10-14,共5页Journal of Hubei Polytechnic University

基　　金：国家高新技术研究与发展项目(863重大专项)(项目编号:2007AA06Z418);湖北省自然科学基金项目(项目编号:2015CFA137);湖北理工学院引进人才项目(项目编号:18xjz03R)。

摘　　要：通过绿色方法一步合成了铅试剂功能化的CdTe量子点,构建了具有高灵敏度的重金属铅的荧光探针,并采用巯基乙酸对其进行了表面修饰。研究结果表明,合成的量子点具有较高的量子产率。双硫腙通过表面配位反应结合到量子点表面,荧光共振能量转移使其荧光猝灭,而铅离子能破坏量子点-双硫腙复合物的荧光共振能量,使量子点荧光逐渐恢复,利用这一原理,可以达到检测铅离子的目的。双硫腙功能化CdTe量子点能够检测浓度为10~20μmol/L的铅离子,可有效用于污水中痕量铅离子的检测。In this study,the green method was developed to synthesize lead ion functioalized CdTe quantum dots(QDs)in one pot,constructing sensitive lead ion fluorescent probes.It was modified by mercaptoacetic acid in an aqueous solution.The results showed the obtained QDs had a good quantum yields.Dithizone was bound to the QDs via a surface coordinating reaction.The fluorescence of the QDs was quenched by fluorescence resonance energy transfer mechanism.Upon the addition of lead,a dramatic enhancement of the fluorescence intensity was observed to achieve the purpose of monitoring,which resulted from the fluorescence resonance energy transfer pathway shutting off.Providing a very wide range of Pb 2+concentration from 10 to 20μmol/L can be successfully applied to the determination of lead ion in wastewater samples.

关 键 词：功能化 量子点 重金属检测 

分 类 号：X52[环境科学与工程—环境工程] O613.5[理学—无机化学]