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Post\u2010modification of 6\u2010aminocaproic acid on the COFs yielded carboxyl\u2010modified COFs (COFs\u2010COOH). The modification enhanced the hydrophilicity and adsorption efficiencies of COFs\u2010COOH for malachite green (MG) and crystal violet (CV). A COFs\u2010COOH\u2010based dispersive solid\u2010phase extraction coupled with high\u2010performance liquid chromatography was developed for the analysis of MG and CV. The method showed a linear range from 10 to 1000\u00a0ng\/mL with detection limits of 1.82 and 0.70\u00a0ng\/mL for MG and CV detection, respectively. The recoveries of MG and CV from water samples collected from fish farms and markets ranged from 91.63% to 107.10% with relative standard deviations below 5%. Reproducibility tests demonstrated that the adsorption efficiencies of COFs\u2010COOH were maintained at above 85.86% over 15 cycles. The study verified the potential of COFs\u2010COOH as sorbents for the enrichment and separation of triphenylmethane dyes from complex samples.<\/jats:p>","DOI":"10.1002\/jssc.202400013","type":"journal-article","created":{"date-parts":[[2024,5,31]],"date-time":"2024-05-31T11:23:12Z","timestamp":1717154592000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Carboxyl\u2010functionalized covalent organic frameworks for the extraction of malachite green and crystal violet in environmental water samples prior to quantification by high\u2010performance liquid chromatography"],"prefix":"10.1002","volume":"47","author":[{"given":"Bingmei","family":"Lai","sequence":"first","affiliation":[{"name":"Guangxi Colleges and Universities Key Laboratory of Food Safety and Detection, College of Chemistry and Bioengineering Guilin University of Technology  Guangxi 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