Colorimetric Method Based on Cerium Dioxide/Iron Oxyhydroxide Nanozyme for Rapid Detection of Hydrogen Peroxide in Chicken Feet with Pickled Pepper
In this study,an innovative cerium dioxide-modified iron oxyhydroxide(CeO2/FeOOH)nanozyme with peroxidase-like activity was synthesized by one-step hydrothermal method.The CeO2/FeOOH nanozyme could catalyze the decomposition of hydrogen peroxide(H2O2)to produce hydroxyl and superoxide anion radicals,which in turn could oxidize 3,3',5,5'-tetramethylbenzidine(TMB)to produce a blue substance(oxidized TMB,ox-TMB).Based on this,a CeO2/FeOOH-based colorimetric sensor was constructed for the detection of H2O2.The results showed that the colorimetric sensor exhibited a highly sensitive response to H2O2 with a detection limit of 3.92 μmol/L and a linear range of 10 to 1 000 μmol/L.The recoveries for spiked samples ranged from 90.59％to 93.42％with relative standard deviations(RSDs)not more than 4.25％.The developed method had the advantages of high sensitivity,high accuracy,speediness and simplicity.
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