Abstract
A novel perylene diimide (PDI) functionalized CeO2 nanocomposite (NC) was successfully fabricated via one-pot hydrothermal method. Compared with pure CeO2 nanoparticles (CeO2 NPs), the NC catalyst presents more Ce3+ and active oxygen species and exhibits a higher peroxidase mimicking activity towards the oxidation 3,3',5,5'-tetramethylbenzidine by H2O2 to form a blue product with an absorption maximum at 652nm. The composite catalyst shows high sensitivity and selectivity toward H2O2 determination in the range of 20 to 80μM with a limit of detection (LOD) of 2.59μM. Based on the colorimetric method, a sensitive method for detecting the reduced glutathione (GSH) was also established over arrange of 1~4μM with a LOD of 0.92μM. Electron spin resonance (ESR) experiments suggest that the active radicals during the catalytic processes are •OH and •O2-. A possible synergistic catalytic mechanism is discussed. Graphical abstract Schematic presentation of the possible catalytic mechanism for colorimetric determination of hydrogen peroxide and glutathione based on the peroxidase-like activity perylene-diimide (PDI) functionalized CeO2 nanocomposite.
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