Fluorescence Turn-on Detection of Perfluorooctanoic Acid (PFOA) by Perylene Diimide-Based Metal–Organic FrameworkClick to copy article linkArticle link copied!
- Rana DalapatiRana DalapatiNano Institute of Utah, and Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United StatesMore by Rana Dalapati
- Matthew HunterMatthew HunterNano Institute of Utah, and Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United StatesMore by Matthew Hunter
- Mostakim SKMostakim SKLab of Soft Interfaces, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, IndiaMore by Mostakim SK
- Xiaomei YangXiaomei YangNano Institute of Utah, and Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United StatesMore by Xiaomei Yang
- Ling Zang*Ling Zang*Email: [email protected]Nano Institute of Utah, and Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United StatesMore by Ling Zang
Abstract
A novel, water-stable, perylene diimide (PDI) based metal–organic framework (MOF), namely, U-1, has been synthesized for selective and sensitive detection of perfluorooctanoic acid (PFOA) in mixed aqueous solutions. The MOF shows highly selective fluorescence turn-on detection via the formation of a PFOA-MOF complex. This PFOA-MOF complex formation was confirmed by various spectroscopic techniques. The detection limit of the MOF for PFOA was found to be 1.68 μM in an aqueous suspension. Upon coating onto cellulose paper, the MOF demonstrated a significantly lower detection limit, down to 3.1 nM, which is mainly due to the concentrative effect of solid phase extraction (SPE). This detection limit is lower than the fluorescence sensors based on MOFs previously reported for PFAS detection. The MOF sensor is regenerable and capable of detecting PFOA in drinking and tap water samples. The PDI-MOF-based sensor reported herein represents a novel approach, relying on fluorescence turn-on response, that has not yet been thoroughly investigated for detecting per- and polyfluoroalkyl substances (PFAS) until now.
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