Advances in Functionalized Metal–Organic Frameworks for PFAS Detection: Design, Mechanisms, Performance, and Future Perspectives

Why It Matters

MOF‑based PFAS sensors could dramatically improve environmental monitoring, enabling faster, cheaper, and more accurate contamination assessments worldwide.

Key Takeaways

• Functionalized MOFs enable trace-level PFAS detection.
• Pre‑synthetic modifications tune pore selectivity for fluorinated compounds.
• Post‑synthetic functionalization enhances sensor signal transduction.
• Composite MOF platforms improve stability in complex water matrices.
• Field deployment hindered by integration of sampling and preconcentration.

Pulse Analysis

The growing regulatory scrutiny of PFAS—often called "forever chemicals"—has spurred a race for detection technologies that combine sensitivity with practicality. Traditional analytical methods, while accurate, demand expensive instrumentation and extensive sample preparation, limiting real‑time monitoring. Functionalized metal‑organic frameworks address this gap by leveraging their exceptionally high surface areas and customizable pore chemistries, allowing selective adsorption of PFAS molecules even at parts‑per‑trillion concentrations. Recent advances in pre‑synthetic design enable precise control over pore dimensions, while post‑synthetic grafting introduces functional groups that amplify optical or electrochemical signals, turning MOFs into versatile transducers.

Beyond material synthesis, the review highlights how MOFs are being integrated into diverse sensing modalities. Fluorescent MOFs emit measurable light shifts upon PFAS binding, offering rapid visual readouts. Surface‑enhanced Raman spectroscopy (SERS) exploits MOF‑supported metallic nanostructures to achieve molecular fingerprinting with unprecedented clarity. Electrochemical platforms benefit from MOFs’ conductive pathways, delivering low‑limit‑of‑detection voltammetric responses. Comparative performance data indicate that these MOF‑based sensors consistently outperform conventional sorbents, delivering faster response times and higher selectivity in laboratory settings.

Despite laboratory successes, scaling these technologies for field use remains a hurdle. Real‑world water samples contain competing ions, organic matter, and variable pH, which can degrade sensor performance. The authors argue that future progress hinges on integrating MOFs with microfluidic sampling, on‑chip preconcentration, and robust packaging to tolerate harsh environments. By bridging material innovation with system engineering, MOF‑based PFAS detectors could become indispensable tools for municipalities, industries, and environmental agencies striving to mitigate the pervasive threat of PFAS contamination.