Cobalt tuned copper sulfide on montmorillonite: Peroxidase-like activity, catalytic mechanism and colorimetric sensing of hydrogen peroxide

References

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358Cobalt tuned copper sulfide on montmorillonite: Peroxidase-like activity, catalytic mechanism and colorimetric sensing of hydrogen peroxidehttps://doi.org/10.1016/j.colsurfa.2020.125063CompositeCo-doped CuS-Montmorillonite (Co/CuS-MMT)

Materials

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BET
b nanozyme
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35850Co/CuS-MMT100nmIt can be found that the porous hollow spheres of 50Co/CuS-MMT with ca. 100 nm are composed of even smaller nanoparticles with the size of ca. 2 nm.

Kinetics

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vmax 10n
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kcat
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35850Co/CuS-MMTPODH2O23.422mM7.054-8M/s358358
35850Co/CuS-MMTPODTMB0.077mM10.373-8M/s358

Applications

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linear range
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35850Co/CuS-MMTdetection of H2O2 residue in contact lens solutionH2O2Color10-100μM2.2μMFig. 6B displays that the absorbance at 652 nm was linearly correlated with H2O2 concentration from 10 to 100 μM and the limit of detection (LOD) was calculated to be 2.2 μM (LOD = 3 s/k, where s, k are the relative standard deviation of eight parallel controlled measurements and the slope of the linear calibration plots, respectively. In this formula, s = 0.000157, k = 2.14 × 10−4, and therefore, LOD =2.2 μM).
35850Co/CuS-MMTdetection of H2O2 residue in contact lens solutionH2O2Color10-100μM2.2μM