A colorimetric assay is described for sensitive determination of Hg ions based on the MoS-Au composites as peroxidase mimetics, which are synthesized by microwave-assisted solvothermal method. The addition of Hg stimulates their peroxidase-like activity, along with lower Michaelis constant toward the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) with HO, allowing the composites for direct determination of Hg. A broad linear response is obtained ranging from 20 nM to 20 μM with a detection limit (LOD) of 5 nM. The superior peroxidase-like activity is attributed to the large surface area of MoS nanosheets and the synergistic catalytic effect of MoS and Au. The Hg-stimulation effect implies the strong interaction between Hg and MoS-Au, where the XPS results confirm the presence of metallic Hg, indicative of an Au-Hg amalgam. This colorimetric assay is successfully applied for the determination of Hg in environmental water (tap water and Yellow River water) with excellent selectivity over interfering cations.
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