Colorimetric Detection of Sulfide Anions via Redox-Modulated Surface Chemistry and Morphology of Au-Hg Nanorods.

Xiaotian Zhu,Chang Liu,Jie Liu

doi:10.1155/2019/8961837

Xiaotian Zhu, Chang Liu + Show 1 more

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https://doi.org/10.1155/2019/8961837

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Abstract

A new colorimetric assay for the detection of sulfide anions with high sensitivity and selectivity is reported, utilizing Au-Hg alloy nanorods (Au-HgNRs) as probe. Au-HgNRs were prepared by modifying gold nanorods (AuNRs) with reducing agent and mercury ions. In an aqueous solution with sulfide anions, the formation of mercuric sulfide due to redox reaction between the amalgams and sulfide anions greatly changed the surface chemistry and morphology of the Au-HgNRs, leading to a red shift of the localized surface plasmon resonance (LSPR) absorption peak, accompanied by a change in colorimetric response. A good linear relationship was obtained between the LSPR peak wavelength shift and concentration of sulfide anion in the range of 1 × 10−5−1 × 10−4 mol/L. The selectivity of this method has been investigated by other anions. The colorimetric sensing system successfully detected sulfide in wastewater from leather industry.

Highlights

Monitoring ClO3−, Br−, oafnidnoNrgOa2n−icinanaioqnusatsicucehcoassySst2e−m, Bs riOs 3a−l,wCaylOs 2a−n, important issue because these anions exert adverse effects on the environment [1,2,3]
The results indicate our new approach for the colorimetric detection of S2− is fast, simple, quantitative, and selective
These findings suggest that surface chemistry modification of AuNPs or Au-HgNRs were prepared by modifying gold nanorods (AuNRs) could be a promising strategy for colorimetric detection applications

Summary

Introduction

Monitoring ClO3−, Br−, oafnidnoNrgOa2n−icinanaioqnusatsicucehcoassySst2e−m, Bs riOs 3a−l,wCaylOs 2a−n, important issue because these anions exert adverse effects on the environment [1,2,3]. Increasing concerns over monitoring sulfide anions in aqueous solution have motivated the development of new methods with high selectivity, sensitivity, and rapidity. Several techniques are available for the detection of sulfide anion, such as chromatography [4, 5], electrophoresis [6], and fluorimetry [7]. These approaches are proved to be sensitive and selective. Developing an accurate, fast-response, cost-effective sensor for on-site sulfide anion detection is helpful and still urgently needed

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