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Amino-Functionalized Lanthanide Metal-Organic Frameworks for Ratiometric Detection of Perfluorooctanoic Acid
Wenya Xia1, Qingyu Niu1, Xiao Liu1,2
1School of Chemical Engineering and Technology, Hebei University of Technology, XiPing Dao 5340, Beichen District, Tianjin 300401, P. R. China.
ACS Applied Materials & Interfaces
|September 4, 2025
Summary
A novel amine-functionalized lanthanide metal-organic framework, EuTPTC-NH2, enables sensitive detection of perfluorooctanoic acid (PFOA). This material offers a visual color change for PFOA detection in water.
Area of Science:
- Materials Science
- Environmental Chemistry
- Analytical Chemistry
Background:
- Perfluorooctanoic acid (PFOA) is a persistent organic pollutant found globally in water, air, and soil.
- Effective detection methods are crucial for monitoring PFOA contamination and its environmental impact.
Purpose of the Study:
- To develop a water-stable, amine-functionalized lanthanide metal-organic framework (EuTPTC-NH2) for the ratiometric luminescence detection of PFOA.
- To investigate the sensing mechanism and evaluate the performance of EuTPTC-NH2 for PFOA detection.
Main Methods:
- Synthesis and characterization of the amine-functionalized lanthanide metal-organic framework, EuTPTC-NH2.
- Ratiometric luminescence spectroscopy for PFOA detection, analyzing changes in emission intensity and color.
- Experimental and theoretical studies (e.g., hydrogen bonding, electrostatic interactions) to elucidate the interaction between EuTPTC-NH2 and PFOA.
Main Results:
- EuTPTC-NH2 demonstrated a ratiometric luminescence response to PFOA, with increased organic ligand emission and decreased Eu3+ ion luminescence.
- A distinct visual color change from red to blue was observed upon PFOA presence.
- Achieved a low limit of detection (16.1 nM), rapid response time (37 s), and excellent selectivity for PFOA in distilled water.
Conclusions:
- EuTPTC-NH2 serves as an effective platform for highly sensitive and visual detection of PFOA.
- The sensing mechanism involves hydrogen bonding, electrostatic interactions, and C-F···H-Ar interactions.
- This approach offers a novel strategy for detecting per- and polyfluoroalkyl substances (PFAS) in aqueous environments.
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