{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T17:34:34Z","timestamp":1784828074649,"version":"3.55.0"},"reference-count":76,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2023,12,18]],"date-time":"2023-12-18T00:00:00Z","timestamp":1702857600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Porous covalent organic frameworks (COFs) have been widely used for the efficient removal of iodine from solution due to their abundance of electron-rich sites. In this study, two kinds of ketoenamine-based COFs, TpBD-(OMe)2 and TpBD-Me2, are successfully synthesized via Schiff base reaction under solvothermal conditions using 1, 3, 5-triformylphoroglucinol as aldehyde monomer, o-tolidine and o-dianisidine as amino monomers. The ability of TpBD-(OMe)2 and TpBD-Me2 to adsorb iodine in cyclohexane or aqueous solutions has been quantitatively analyzed and interpreted in terms of adsorption sites. TpBD-Me2 possesses two adsorption sites, -NH- and -C=O, and exhibits an adsorption capacity of 681.67 mg\/g in cyclohexane, with an initial adsorption rate of 0.6 g\/mol\/min with respect to COF unit cell. The adsorption capacity of TpBD-(OMe)2 can be as high as 728.77 mg\/g, and the initial adsorption rate of TpBD-(OMe)2 can reach 1.2 g\/mol\/min in the presence of oxygen atoms between the methyl group and the benzene ring. Compared with TpBD-Me2, the higher adsorption capacity and adsorption rate of TpBD-(OMe)2 towards iodine are not only reflected in organic solvents, but also in aqueous solutions. It is proven through X-ray photoelectron spectroscopy and Raman spectroscopy that iodine exists in the form of I2, I3\u2212, and I5\u2212 within TpBD-(OMe)2 and TpBD-Me2 after adsorption. This work not only expands the application of COFs in the field of iodine adsorption, but also provides research ideas and important an experimental basis for the optimization of iodine adsorption sites.<\/jats:p>","DOI":"10.3390\/molecules28248151","type":"journal-article","created":{"date-parts":[[2023,12,18]],"date-time":"2023-12-18T11:28:07Z","timestamp":1702898887000},"page":"8151","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Construction of Ketoenamine-Based Covalent Organic Frameworks with Electron-Rich Sites for Efficient and Rapid Removal of Iodine from Solution"],"prefix":"10.3390","volume":"28","author":[{"given":"Qi","family":"Tao","sequence":"first","affiliation":[{"name":"College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4310-4649","authenticated-orcid":false,"given":"Xiao","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education (MOE), School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi\u2019an 710062, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liping","family":"Jing","sequence":"additional","affiliation":[{"name":"College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lu","family":"Sun","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Northeast Normal University, Changchun 130024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peipei","family":"Dang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,12,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"649","DOI":"10.1126\/science.256.5057.649","article-title":"Colloid Formation During Waste Form Reaction: Implications for Nuclear Waste Disposal","volume":"256","author":"Bates","year":"1992","journal-title":"Science"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Wang, C., Jiang, S., Ma, W., Liu, Z., Liu, L., Zou, Y., Xu, B., and Tian, W. 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