Colorimetric Sensor Based on Mn3O4 with Oxidase-Like Catalytic Activity for Detection of Perfluorooctane Sulfonate
Perfluorinated compounds(PFCs)one of the persistent organic environmental pollutants(POPs),are difficult to degrade in the natural environment,which accumulate in the environment and human body,and have systemic multi-organ toxicity,which is.In this paper,we synthesized Mn3O4 nanozyme with excellent oxidase(OXD)catalytic activity,characterized their morphology,structure and composition,and verified their OXD-like activity by TMB color system.Mn3O4 has high affinity and catalytic efficiency for TMB,with a Km value of 0.03146 mmol/L and a Vmax value of 5.362 × 10 7 mol/(L·s).Based on the inhibition effect of perfluorooctane sulfonate(PFOS)on the color system,a colorimetric sensor based on Mn3O4 nanozyme was established for the detection of PFOS.The concentration of PFOS showed a linear relationship with the absorbance in the range of 12-50 μmol/L with a limit of detection of 3.595 μmol/L.The method has good anti-interference ability,repeatability and stability.And satisfactory recoveries were obtained when applied for the determination of PFOS in real water samples,with the recoveries ranging from 99.2％to 104.5％and the relative standard deviations(RSDs)ranging from 1.37％to 7.17％.The experimental results demonstrated that the colorimetric sensing based on Mn3O4 nanozyme provided a new method for the detection of PFOS in environmental samples.
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