铅离子在CdS量子点的表面吸附行为

doi:10.3969/j.issn.1000-1565.2018.02.007

河北大学学报(自然科学版) ›› 2018, Vol. 38 ›› Issue (2): 154-158.DOI: 10.3969/j.issn.1000-1565.2018.02.007

铅离子在CdS量子点的表面吸附行为

张红,田晶,马刚，杜保安

收稿日期:2016-10-11 出版日期:2018-03-25 发布日期:2018-03-25
通讯作者: 杜保安(1963—),男,河北安国人,河北大学教授,主要从事量子点合成与应用研究.E-mail:baoandu@sina.com
作者简介:张红(1981—),女,河北阜城人,河北大学实验师,主要从事量子点在分析化学中的应用研究. E-mail:zh820516@163.com
基金资助:
国家自然科学基金资助项目(21075027);教育部科学技术研究重点项目(211014)

Adsorption behavior of Pb²⁺on the CdS quantum dots surface

ZHANG Hong,TIAN Jing,MA Gang,DU Baoan

College of Chemistry and Environment Science, Hebei University, Baoding 071002, China

Received:2016-10-11 Online:2018-03-25 Published:2018-03-25

摘要/Abstract

摘要： 制备了性能优良的CdS量子点,量子点在水相中是高度单分散的.前人的研究表明,量子点的荧光发射对金属离子非常敏感,很容易被金属离子猝灭.根据这种现象研究了CdS量子点的表面对铅离子吸附的影响因素和机制.结果表明,下面的几个因素对荧光猝灭有主要的影响:溶液的酸度,量子点浓度,附着在量子点表面的铅离子的量.实验数据显示,CdS量子点表面对铅离子的吸附符合Langmuir等温吸附方程,c/ΔF与铅离子的浓度c是直线关系,浓度范围达到6个数量级.当在较小的浓度1×10^-8~1×10^-9mol/L时,ΔF与铅离子浓度c也是直线关系,线性相关系数为0.962 5,在此基础上,建立了铅离子的定量分析方法,方法的检出限为6.0×10^-10 mol/L,相对标准偏差为2.5%,回收率为88.4%~107.2%.

关键词: 铅离子, CdS量子点, 荧光光谱, Langmuir等温吸附

Abstract: In this paper,the mono-dispersed CdS quantum dots(QDS)were prepared in water.The fluorescence of the CdS QDs could be intensely quenched by the Pb²⁺,and the quenching effect was used to study the adsorption behavior of the Pb²⁺on the QDs’ surface.The result showed that the quenching effect was strongly influenced by the pH value and the QDs concentration,and involved the number of the Pb²⁺ adsorbed on the QDs’ surface.The adsorption behavior of the Pb²⁺ was consistent with the Langmuir isotherm equation,the relationship between the c/ΔF and c was linear,when the concentration of the Pb²⁺ was between 10^-9 and 10^-3mol/L.According to the Langmuir isotherm equation,the relationship of theΔF and c was also found to be linear at the low Pb²⁺ concentration of 1×10^-8~1×10^-9mol/L.And it was possible to determine the Pb²⁺concentration by using the line as the standard line.The detect limit was as low as 6.0×10^-10 mol/L,the RSD was 2.5%,and the recovery rate was 88.4%~107.2%.

Key words: Pb²⁺, CdS quantum dots, fluorescence, Langmuir isotherm equation

中图分类号:

张红,田晶,马刚杜保安. 铅离子在CdS量子点的表面吸附行为[J]. 河北大学学报(自然科学版), 2018, 38(2): 154-158.

ZHANG Hong,TIAN Jing,MA Gang,DU Baoan. Adsorption behavior of Pb²⁺on the CdS quantum dots surface[J]. Journal of Hebei University (Natural Science Edition), 2018, 38(2): 154-158.

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铅离子在CdS量子点的表面吸附行为

Adsorption behavior of Pb²⁺on the CdS quantum dots surface

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铅离子在CdS量子点的表面吸附行为

Adsorption behavior of Pb2+on the CdS quantum dots surface

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Adsorption behavior of Pb²⁺on the CdS quantum dots surface