Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (10): 2303.doi: 10.7503/cjcu20130456

• Analytical Chemistry • Previous Articles     Next Articles

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

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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