A Multiemission MOF-Based Fluorescent Sensor Array Functionalized with pH-Sensitive Dyes for Highly Sensitive Detection and Identification of PFASs

and RGH@PCN-999, exhibited excellent water stability and luminescence persistence, exhibiting triple-emission and dual-emission channels under single-wavelength excitation, respectively. The fluorescent sensor array constructed by these two Dye@MOFs could be applied for the highly sensitive detection and identification of six PFASs based on the differential fluorescence responses. Combined with principal component analysis (PCA) and hierarchical cluster analysis (HCA), this fluorescent sensor array could accurately distinguish six PFASs with concentrations as low as 0.5 μM, and their multicomponent mixtures were also successfully realized, with the limit of detection for individual PFASs as low as 21.8 nM. Additionally, the sensor array demonstrated excellent discrimination and semiquantitative detection of PFASs in complex matrices, including tap water, lake water, and washing liquor from firefighting protective clothing. Powder X-ray diffraction (PXRD), infrared absorption spectrum (FT-IR), and X-ray photoelectron spectroscopy (XPS) further verified that the fluorescent sensor array might involve static fluorescence quenching.