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Issue 17, 2019
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Colorimetric detection of Ba2+, Cd2+ and Pb2+ based on a multifunctionalized Au NP sensor

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Abstract

In this work, we developed a colorimetric method for the detection of three kinds of ions with one kind of detection reagent. In detail, gold nanoparticles (Au NPs) multifunctionalized with 3-mercaptonicotinic acid and 4-aminobenzo-18-crown-6 (3-MPA-abc) were prepared and used as a colorimetric sensor for the simple and rapid detection of Ba2+, Cd2+ and Pb2+ ions. After adding Ba2+/Cd2+/Pb2+, the oxygen atom in the crown ether cavity and the carboxyl group of 3-mercaptopropionic acid can react with Ba2+/Cd2+/Pb2+ to form coordination bonds, resulting in the aggregation of the functionalized Au NPs and the color change of Au NP solution. The LOD of the colorimetric sensor for Ba2+/Cd2+/Pb2+ is 20 nM, 20 nM and 50 nM by the naked eye, respectively. A good linear relationship (R2 = 0.9984, R2 = 0.9917, R2 = 0.9934) between the absorbance ratio and Ba2+/Cd2+/Pb2+ concentrations indicates that our Au NP based colorimetric sensor can be used for the quantitative assay of Ba2+/Cd2+/Pb2+, and this detection method was successfully applied in the detection of Ba2+/Cd2+/Pb2+ in real environmental samples.

Graphical abstract: Colorimetric detection of Ba2+, Cd2+ and Pb2+ based on a multifunctionalized Au NP sensor

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Publication details

The article was received on 08 May 2019, accepted on 28 Jun 2019 and first published on 28 Jun 2019


Article type: Paper
DOI: 10.1039/C9AN00836E
Analyst, 2019,144, 5081-5089

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    Colorimetric detection of Ba2+, Cd2+ and Pb2+ based on a multifunctionalized Au NP sensor

    J. Qiu, Z. Li, L. Miao, H. Wang, Y. Zhang, S. Wu, Y. Zhang, X. Li and A. Wu, Analyst, 2019, 144, 5081
    DOI: 10.1039/C9AN00836E

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