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PFAS usually exist in trace concentrations in environmental water bodies, which poses great challenges for environmental analysis. In this study, environmentally friendly cellulose was modified with polyaniline through in situ oxidative polymerization, and used as the filter paper for solid\u2010phase extracting 23 PFAS in water. Characterization techniques such as scanning electron microscope, Fourier transform infrared spectroscopy, X\u2010ray photoelectron spectrometer, and thermogravimetric analysis indicated the successful synthesis of structurally stable polyaniline\u2010modified cellulose filter paper (PANI\/CFP). Then, a high\u2010performance liquid chromatograph\u2010triple quadrupole mass spectrometry determination method was established for 23 PFAS from water using PANI\/CFP extraction. The optimal adsorption occurred at a solution pH of 3.0\u20135.0, and the best elution efficiency can be achieved using methanol with 2% added ammonia water. The adsorption mechanism of 23 PFAS by PANI\/CFP can be considered as the result of synergistic effects between physical and chemical adsorption. The recovery rates for 23 PFAS in groundwater, surface water, and wastewater ranged from 65.8% to 105%, with limits of detection and quantification from 0.44 to 36.5\u00a0ng\/L. After being reused five times, PANI\/CFP can still maintain a good extraction recovery rate for PFAS.\u00a0This study successfully prepared PANI\/CFP and established an experimental method flow for its application in the extraction and detection of 23 PFAS in water. The PANI\/CFP has the characteristics of stable structure and properties, and easy operation.<\/jats:p>","DOI":"10.1002\/jssc.70076","type":"journal-article","created":{"date-parts":[[2025,1,23]],"date-time":"2025-01-23T06:25:46Z","timestamp":1737613546000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Preparation of Polyaniline Modified Cellulose Filter Paper and Its Application in Detecting 23 Per\u2010 and Polyfluoroalkyl Substances"],"prefix":"10.1002","volume":"48","author":[{"given":"Hong\u2010Yu","family":"You","sequence":"first","affiliation":[{"name":"Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou China"},{"name":"University of Chinese Academy of Sciences Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hong\u2010Yi","family":"Yin","sequence":"additional","affiliation":[{"name":"Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou China"},{"name":"University of Chinese Academy of Sciences Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia\u2010Hui","family":"Zhao","sequence":"additional","affiliation":[{"name":"CAS Testing Technical Services (Guangzhou) Co. 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