Journal
MICROCHEMICAL JOURNAL
Volume 150, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.microc.2019.104154
Keywords
Fluorescent sensor; Cation exchange; ZnMOF-74; Metal-organic frameworks
Categories
Funding
- National Natural Science Foundation of China [21465015, 21665012]
- Ground Plan of Science and Technology Projects of Jiangxi Educational Committee [KJLD14023]
- Open Project Program of Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University [KLFS-KF-201708, KLFS-KF-201713]
- Youth Science and Technology Innovation Fund of Jiangxi Hydrographic Bureau [SWJJ-KT201805]
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Fluorescent metal-organic frameworks (MOFs) have attracted wide attention in fluorescence detection. Herein, a novel sensing platform for highly selective and sensitive detection of Fe3+ in aqueous solution was proposed based on 2,5-dihydroxyterephthalic acid (DOBDC)-Zn2+ MOFs (ZnMOF-74). The as-prepared ZnMOF-74 exhibited uniform clavicorn nanostructures and high day-to-day stability in acidic aqueous solution (pH 4.0). Because of the special response of phenolic hydroxyl groups of DOBDC with Fe3+, the cation exchange between Fe3+ and Zn2+ occurred, which caused collapse of the skeleton and formed a blue weak-fluorescent iron(III)-phenol salt complex (Fe-DOBDC), which led to the effective fluorescence quenching of ZnMOF-74. ZnMOF-74 was used as a probe for detection of Fe3+ under relatively acidic condition with a good linear range of 0.1-100 mu M and a low detection limit of 40 nM. The fluorescence probe was also applied to determine Fe3+ in real river water and human serum with good recovery and accuracy. This work provided a good Fe3+ sensor based on ZnMOF-74 due to high affinity between phenolic hydroxyl group and Fe3+.
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