Issue 44, 2021

N,S co-doped Co3O4 core–shell nanospheres with high peroxidase activity for the fast colorimetric detection of catechol

Abstract

It is necessary to develop nanoperoxidases with high activity to construct a fast and cheap sensing platform for real-time detection of some pollutants. In this study, the as-prepared N and S co-doped core–shell cobaltosic oxide nanospheres (N,S-Co3O4) exhibit excellent peroxidase-like activity. The oxidation reaction of the colorless chromogenic substrate TMB by H2O2 is used to evaluate the peroxidase-like behaviors of N,S-Co3O4. As expected, the N,S-Co3O4 nanospheres accelerated the oxidation of TMB accompanied by a blue shift only in 1 min. Thus, the N,S-Co3O4 nanoperoxidase exhibits high affinity towards TMB (Km = 0.072 mM) and H2O2 (Km = 3.78 mM). Moreover, as the catalytic process of N,S-Co3O4 can be inhibited in the presence of catechol, a fast inexpensive colorimetric sensor of catechol with high sensitivity and good selectivity was constructed. The enhanced catalytic activity of N,S-Co3O4 is attributed to some active species, including h+ and ˙O2, owing to the more active sites on N,S-Co3O4. The colorimetric method has been validated by detecting catechol in real water samples for practical application.

Graphical abstract: N,S co-doped Co3O4 core–shell nanospheres with high peroxidase activity for the fast colorimetric detection of catechol

Supplementary files

Article information

Article type
Paper
Submitted
01 Sep 2021
Accepted
09 Oct 2021
First published
21 Oct 2021

Anal. Methods, 2021,13, 5377-5382

N,S co-doped Co3O4 core–shell nanospheres with high peroxidase activity for the fast colorimetric detection of catechol

X. Liu, X. Cao, S. Zhao, Z. Liu, G. Lu and Q. Liu, Anal. Methods, 2021, 13, 5377 DOI: 10.1039/D1AY01500A

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