Issue 11, 2022

Mimetic peroxidase based on a gold amalgam for the colorimetric sensing of trace mercury(ii) in water samples

Abstract

The development of an efficient protocol to achieve the precise monitoring of trace Hg2+ is of great significance. In this work, a colorimetric sensing platform for Hg2+ monitoring was constructed via modifying gold nanoparticles (Au NPs) and hemin/reduced graphene oxide (H-rGO) onto carbon cloth (CC) (AuNPs/H-rGO/CC). The Au NPs, anchored on the surface of the interlaced fibers of CC without aggregation, showed high peroxidase-mimetic catalytic activity. The formed Au amalgam and the synergistic effect of Au NPs and H-rGO enhanced the peroxidase-mimetic activity of AuNPs/H-rGO/CC and enabled the sensing platform to achieve the colorimetric detection of Hg2+ over a wide range of 3.2 × 10−10 M–1.0 × 10−6 M. AuNPs/H-rGO/CC exhibited high selectivity towards Hg2+ due to the high special affinity between Au NPs and Hg2+. The sensing platform was further successfully applied to the determination of Hg2+ in different water samples via a simplified operation involving just tweezers. The present sensing protocol is expected to provide an efficient way to construct colorimetric sensors and to promote the sensitive determination of Hg2+ for a variety of relevant applications.

Graphical abstract: Mimetic peroxidase based on a gold amalgam for the colorimetric sensing of trace mercury(ii) in water samples

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2022
Accepted
25 Apr 2022
First published
30 Apr 2022

Analyst, 2022,147, 2388-2395

Mimetic peroxidase based on a gold amalgam for the colorimetric sensing of trace mercury(II) in water samples

J. Jiang and X. Kan, Analyst, 2022, 147, 2388 DOI: 10.1039/D2AN00560C

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