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Here, a targeted in situ methylation strategy is reported to engineer permanent cationic centers within a robust non\u2010substituted quinoline\u2010linked COF (NQ\u2010COF\n                    <jats:sub>S1<\/jats:sub>\n                    ). Methyl grafting at the nitrogen sites generates quaternary ammonium groups, inducing pronounced local charge polarization and a strong built\u2010in electric field. This modification drastically reduces the exciton binding energy from 41 to 33 meV, thereby promoting highly efficient charge separation. In synergy with electron\u2010rich thiophene units, the resulting NQ\u2010COF\n                    <jats:sub>S1<\/jats:sub>\n                    \u2010Me exhibits outstanding photocatalytic activity, characterized by strong reactive oxygen species generation. It achieves &gt; 95% inactivation of Gram\u2010positive, Gram\u2010negative, and drug\u2010resistant bacteria within 10\u00a0min, and 96.84% degradation of chloramphenicol\u201438.72 times faster than NQ\u2010COF\n                    <jats:sub>S1<\/jats:sub>\n                    . These findings demonstrate that methylation\u2010induced permanent charge polarization offers a powerful strategy for developing high\u2010performance photocatalytic COFs with broad potential in environmental and public health applications.\n                  <\/jats:p>","DOI":"10.1002\/advs.202520563","type":"journal-article","created":{"date-parts":[[2026,1,5]],"date-time":"2026-01-05T05:51:04Z","timestamp":1767592264000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Methylation\u2010Induced Permanent Charge Polarization in Covalent Organic Frameworks for Visible Light\u2010Driven Water Decontamination and Disinfection"],"prefix":"10.1002","volume":"13","author":[{"given":"Xuewen","family":"Peng","sequence":"first","affiliation":[{"name":"College of Food Science and Technology Huazhong Agricultural University Wuhan 430070 China"},{"name":"State Key Laboratory of Marine Food Processing and Safety Control Dalian 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