Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 18, Pages 15364-15368Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b05484
Keywords
chemosensor; colorimetric; covalent organic frameworks; fluorescent; low pH; mixed matrix membranes
Funding
- National Natural Science Foundation of China [21790370, 21790374, 21761132019, U1532259]
- China Postdoctoral Research Foundation [32317532, 32317551]
- Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD)
- Young Thousand Talented Program in China
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Real-time and accurate detection of pH in aqueous solution is of great significance in chemical, environmental, and engineering-related fields. We report here the use of 8-hydroxyquinoline-functionalized covalent organic framework (COF-HQ) for dual-mode pH sensing. In the fluorescent mode, the emission intensity of COF-HQ weakened as the pH decreased, and also displayed a good linear relationship against pH in the range from 1 to 5. In addition, COF-HQ showed discernible color changes from yellow to black as the acidity increased and can be therefore used as a colorimetric pH sensor. All these changes are reversible and COF-HQ can be recycled for multiple detection runs owing to its high hydrolytical stability. It can be further assembled into a mixed matrix membrane for practical applications.
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