CoMoO4 nanobelts as efficient peroxidase mimics for the colorimetric determination of H2O2

• Published in: Mikrochimica acta (1966) Vol. 187; no. 8; p. 424
• Main Authors: Wang, Zhe, Ju, Peng, Zhang, Yu, Jiang, Fenghua, Ding, Haibing, Sun, Chengjun
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.08.2020; Springer Nature B.V
• Subjects: Analytical Chemistry; Biomedical materials; Catalytic activity; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Colorimetry; Hydrogen peroxide; Microengineering; Morphology; Nanochemistry; Nanotechnology; Original Paper; Oxidation; Peroxidase; Selectivity; Surface properties; Nanobelts; TMB; H; Selectivity; SEM; Kinetics; XRD; Peroxidase mimics; Rapid detection; Catalytic mechanism; O
• ISSN: 0026-3672; 1436-5073
• DOI: 10.1007/s00604-020-04376-7

CoMoO 4 materials were prepared through a simple hydrothermal method and developed as highly efficient peroxidase mimics for colorimetric determination of H 2 O 2 . Based on the different experimental conditions in the synthesis process, the CoMoO 4 materials present distinct morphologies, structures, surface properties, and peroxidase mimetic activities. Among them, CoMoO 4 nanobelts (NBs) display the best intrinsic peroxidase mimetic abilities due to the high-energy (100) facet exposed, more Co active sites at (100) facet, more negative potential, and larger specific surface area. It can efficiently catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 to generate a blue oxide. In view of the excellent peroxidase mimetic catalytic activity of CoMoO 4 NBs, a rapid, convenient, and ultrasensitive method was successfully established for the visual and colorimetric determination of H 2 O 2 . The method exhibits good selectivity, practicability, stability, and reusability, and has a detection limit of 0.27 μM. The peroxidase mimetic catalytic mechanism of CoMoO 4 NBs was illustrated according to the kinetic and active species trapping experiments. The method has a good potential for rapid and sensitive determination of H 2 O 2 for biomedical analysis. Graphical abstract Schematic presentation of the process of CoMoO 4 nanobelts catalyzing the oxidation of peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 to generate a typical blue color, which can be applied in rapid and ultrasensitive detection of H 2 O 2 visually.