高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (10): 2303.doi: 10.7503/cjcu20130456

• 分析化学 • 上一篇    下一篇

聚甲基丙烯酸单层保护金纳米粒子选择性检测Pb2+

李军波, 韩晨, 张世杰, 郭进武, 周惠云   

  1. 河南科技大学化工与制药学院, 洛阳 471003
  • 收稿日期:2013-05-15 出版日期:2013-10-10 发布日期:2013-10-10
  • 作者简介:李军波,男,博士,副教授,主要从事功能高分子研究.E-mail:lijunbo@haust.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:51103035)和河南省科技攻关项目(批准号:132102310422)资助.

Selective Detection of Pb2+ Using Poly(methylacrylic acid) Monolayer-protected Gold Nanoparticles

LI Jun-Bo, HAN Chen, ZHANG Shi-Jie, GUO Jin-Wu, ZHOU Hui-Yun   

  1. College of Chemical Engineering & Pharmaceutics, Henan University of Science & Technology, Luoyang 471003, China
  • Received:2013-05-15 Online:2013-10-10 Published:2013-10-10

摘要:

以聚甲基丙烯酸单层保护的金纳米粒子(GNPs)作为传感器, 实现了水溶液中Pb2+的选择性循环检测.先采用柠檬酸钠还原法获得尺寸均匀的GNPs, 再通过具有硫醇端基的聚甲基丙烯酸与金的强耦合作用, 获得了聚甲基丙烯酸单层保护的金纳米粒子(PMAA-@-GNPs).动态光散射、紫外-可见吸收光谱及透射电子显微镜表征证实了其单层结构.在Pb2+的诱导下, PMAA-@-GNPs溶液颜色从酒红色变为紫色并可肉眼识别.透射电子显微镜结果证实, 这种变化是由于Pb2+交联羧基使聚合物发生收缩, 并诱导GNPs的聚集所致.对比Pb2+与Hg2+, Mg2+, Cu2+, Zn2+, Na+, Ni2+, Fe3+, Cd2+, K+和Fe2+溶液颜色的变化, 证实此体系具有一定的选择性.用EDTA可夺取交联的Pb2+, 使PMAA-@-GNPs 的吸收峰恢复并可用于循环检测Pb2+.

关键词: 聚甲基丙烯酸, 金纳米粒子, Pb2+, 检测

Abstract:

In this work, the selective colorimetric detection of Pb2+ was studied using poly(methylacrylic acid) monolayer-protected gold nanoparticles(PMAA-@-GNPs). The GNPs with uniform size and distribution were firstly synthesized by the citrate reduction method. Then PMAA-@-GNPs were prepared by the strong binding of the GNPs and the thiol ends groups of the PMAA. The monolayer structure was proved by the dynamic light scattering, UV-visible spectra and transmission electron microscopy. In the presence of Pb2+, the color of the solution changed from wine red to purple and could be measured by visual inspection. TEM results demonstrated that the induced aggregation of GNPs by Pb2+ crosslinking carboxyl groups. The selectivity of Pb2+ detection has also been investigated by comparing the color changes of solutions with other metal ions, including Hg2+, Mg2+, Cu2+, Zn2+, Na+, Ni2+, Fe3+, Cd2+, K+ and Fe2+. After treated by EDTA, the aggregated PMMA-@-GNPs could be renewable and recycled detecting Pb2+.

Key words: Poly(methylacrylic acid), Gold nanoparticles, Pb2+, Detection

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