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Issue 20, 2017
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Facile colorimetric assay for trinitrotoluene based on the intrinsic peroxidase-like activity of MoS2 nanosheets

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Abstract

In this study, a facile colorimetric assay for 2,4,6-trinitrotoluene (TNT) in aqueous solution is developed based on the intrinsic peroxidase-like activity of cysteine protected molybdenum disulfide nanosheets (Cys-MoS2 NSs). The Cys-MoS2 NSs, obtained from sonication-assisted exfoliation of bulk MoS2 crystals, possess a great intrinsic peroxidase-like activity for the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) by hydrogen peroxide (H2O2) to produce a blue-colored solution. Significantly, the oxidation of TMB was weakened or even prevented in the presence of TNT because of the formation of a Meisenheimer complex between TNT and TMB, which results in a marked decrease in the absorption and a color change of MoS2–TMB–H2O2 solution (TMB reaction system). The relative absorbance is proportional to the logarithm of concentration of TNT in the range of 0–50 μM with a 3σ limit of detection of 10 nM. Moreover, this assay for TNT is also applicable to real water samples.

Graphical abstract: Facile colorimetric assay for trinitrotoluene based on the intrinsic peroxidase-like activity of MoS2 nanosheets

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Publication details

The article was received on 22 Feb 2017, accepted on 28 Apr 2017 and first published on 01 May 2017


Article type: Paper
DOI: 10.1039/C7AY00484B
Citation: Anal. Methods, 2017,9, 2939-2946
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    Facile colorimetric assay for trinitrotoluene based on the intrinsic peroxidase-like activity of MoS2 nanosheets

    Y. Wang, Y. He, R. Peng and S. Chu, Anal. Methods, 2017, 9, 2939
    DOI: 10.1039/C7AY00484B

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