Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 10, Issue 48, Pages 10075-10082Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tb01887j
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Funding
- National Natural Science Foundation of China, P. R. China [22074079, 22006064]
- Natural Resources and Planning Bureau of Changxing County, Zhejiang Province [2022370501000139K]
- opening foundation from School of Chemistry and Chemical Engineering, Henan Normal University, Henan Province, P. R. China
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Covalent organic frameworks (COFs) with a hierarchical hollow structure were used to fabricate COF-Ag nanozymes, which showed enhanced oxidase-like catalytic activity in the presence of Hg2+ ions. A colorimetric platform for highly selective and sensitive analysis of Hg2+ ions was developed based on the COF-Ag catalysis.
Covalent organic frameworks (COFs) were fabricated with a hierarchical flower-like hollow structure, possessing a large specific surface area, high porosity, and excellent environmental stability. In situ growth of noble silver nanoparticles (AgNPs) onto COFs was conducted yielding COF-Ag nanozymes. The structural advantages of COFs can ensure the uniform dispersion and effective size control of AgNPs. More interestingly, the oxidase-like catalytic activity of the obtained COF-Ag nanozymes could be enhanced in the presence of Hg2+ ions, which could specifically interact with AgNPs to form Ag-Hg alloys. A COF-Ag catalysis-based colorimetric platform was thereby constructed for highly selective and sensitive analysis of Hg2+ ions, showing a linear concentration range from 0.050 to 10.0 mu M, with a limit of detection of about 3.7 nM. Besides, the developed colorimetric strategy was successfully applied for detecting Hg2+ ions in human blood with favorable detection recoveries, indicating its potential for applications in the biomedical analysis, environmental monitoring, and food safety fields.
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