Biomass-derived hierarchically porous CoFe-LDH/CeO2 hybrid with peroxidase-like activity for colorimetric sensing of H2O2 and glucose
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AbstractBiomass-derived hierarchically porous CoFe-LDH (layered double hydroxides)/CeO2 hybrid possessing an inherent peroxidase-like activity was first fabricated employing kapok as bio-template. The CeO2 fibers not only exhibited peroxidase-like activity, but also served as a support and guided the deposition of CoFe-LDH nanosheets on their surface to form a hierarchically porous network. The resultant CoFe-LDH/CeO2 hybrid acted as a peroxidase mimic to catalyze 3,3′,5,5′- tetramethylbenzidine (TMB) with H2O2 to generate a typical blue colored product. Furthermore, CoFe-LDH/CeO2 hybrid displayed superior peroxidase-like catalytic property compared to the pristineCeO2 and CoFe-LDH, which was attributed to the presence of more effective active sites of unique hierarchical-porous architecture and the synergistic effect between CoFe-LDH and CeO2. A facile and sensitive sensing system for H2O2 and glucose determination was successfully proposed, which exhibited a sensitive response to glucose ranging from 0.05–2 mM with a detection limit of 0.015 mM based on the accelerated electron transfer between TMB and H2O2 with the assistance of CoFe-LDH/CeO2. This paper offered a feasible way or the fabrication of materials with hierarchical structure and provided a new insight into seeking novel peroxidase mimics with boosted catalytic activities.
All Author(s) ListYang WN, Li J, Yang J, Liu Y, Xu ZP, Sun XF, Wang FD, Ng DHL
Journal nameJournal of Alloys and Compounds
Volume Number815
Article number152276
LanguagesEnglish-United Kingdom
KeywordsCoFe-LDH, CeO2, Peroxidase-like activity, Hierarchical-porous, Colorimetric sensing, Glucose
Web of Science Subject CategoriesChemistry, Physical;Materials Science, Multidisciplinary;Metallurgy & Metallurgical Engineering;Chemistry;Materials Science;Metallurgy & Metallurgical Engineering

Last updated on 2021-24-02 at 00:22