{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T12:13:10Z","timestamp":1788437590211,"version":"build-2803163510"},"reference-count":41,"publisher":"American Chemical Society (ACS)","issue":"34","license":[{"start":{"date-parts":[[2026,8,21]],"date-time":"2026-08-21T00:00:00Z","timestamp":1787270400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002322","name":"Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior","doi-asserted-by":"publisher","award":["001"],"award-info":[{"award-number":["001"]}],"id":[{"id":"10.13039\/501100002322","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003593","name":"Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico","doi-asserted-by":"publisher","award":["NA"],"award-info":[{"award-number":["NA"]}],"id":[{"id":"10.13039\/501100003593","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004586","name":"Funda??o Carlos Chagas Filho de Amparo ? i Pesquisa do Estado do Rio de Janeiro","doi-asserted-by":"publisher","award":["NA"],"award-info":[{"award-number":["NA"]}],"id":[{"id":"10.13039\/501100004586","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>A beta-ketoenamine-linked covalent organic framework named RIO-18, also reported as TpPa COF, featuring CO2-philic C\u2550O\/N\u2013H sites and \u223c17 \u00c5 pores, was incorporated into polyurethane by the casting method at loadings of 0.1\u20135 wt % to prepare xRIO-18@PU mixed matrix membranes (MMMs). Pure-gas permeation of CO2, CH4, and N2, along with their corresponding ideal selectivities, were evaluated at different feed pressures. Thermal and structural analyses confirm that the COF was successfully incorporated into the matrix without altering the polymer structure. Gas permeation tests revealed a substantial increase in CO2 permeability (up to 138%) and CO2\/N2 ideal selectivity (up to 454%) as compared with unloaded PU, with the highest permeability and selectivity gains observed at 3 bar, while CO2\/CH4 selectivity remained comparatively stable across the pressure range studied. These improvements are consistent with preferential CO2\u2013COF interactions and additional transport pathways associated with well-dispersed RIO-18 particles, with COF loading strongly affecting permeation. Overall, the results identify CO2\/N2 separation, relevant to postcombustion CO2 capture scenarios, as the most promising application for these proof-of-concept MMMs, while mixed-gas permeation, sorption\/diffusion analysis, and long-term stability remain to be addressed in future work.<\/jats:p>","DOI":"10.1021\/acsomega.6c06026","type":"journal-article","created":{"date-parts":[[2026,8,22]],"date-time":"2026-08-22T09:59:26Z","timestamp":1787392766000},"page":"51701-51712","source":"Crossref","is-referenced-by-count":0,"title":["COF RIO-18\/Polyurethane\nMixed Matrix Membranes with\nEnhanced CO2 Permeability and CO2\/N2 Selectivity"],"prefix":"10.1021","volume":"11","author":[{"given":"Paulo V. S.","family":"Campos","sequence":"first","affiliation":[{"name":"Universidade Federal do Rio de Janeiro , , Av. Athos da Silveira Ramos, 149 , CT, A-622, Cid. Univ., , ,","place":["Rio de Janeiro, Rio de Janeiro, Brazil, 21941-909"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andresa V.","family":"Ramos","sequence":"additional","affiliation":[{"name":"Universidade Federal do Rio de Janeiro , , ,","place":["Rio de Janeiro, Brazil, 21941-972"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alberto C.","family":"Habert","sequence":"additional","affiliation":[{"name":"Universidade Federal do Rio de Janeiro , , ,","place":["Rio de Janeiro, Brazil, 21941-972"]},{"name":"Universidade Federal do Rio de Janeiro , , ,","place":["Rio de Janeiro, Brazil, 21941-972"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6048-4690","authenticated-orcid":true,"given":"Pierre M.","family":"Esteves","sequence":"additional","affiliation":[{"name":"Universidade Federal do Rio de Janeiro , , Av. Athos da Silveira Ramos, 149 , CT, A-622, Cid. 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Soc.\nRev."},{"issue":"25","key":"2026090307174872400_cit3","doi-asserted-by":"publisher","first-page":"27821","DOI":"10.1021\/acsami.0c06267","article-title":"Covalent Organic Frameworks: Emerging\nOrganic Solid Materials for Energy and Electrochemical Applications","volume":"12","author":"Zhang","year":"2020","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"2026090307174872400_cit4","doi-asserted-by":"publisher","first-page":"117177","DOI":"10.1016\/j.memsci.2019.117177","article-title":"Stainless-Steel-Net-Supported\nSuperhydrophobic\nCOF Coating for Oil\/Water Separation","volume":"587","author":"Jiang","year":"2019","journal-title":"J. Membr.\nSci."},{"key":"2026090307174872400_cit5","doi-asserted-by":"publisher","DOI":"10.1002\/slct.202302060","article-title":"COF-Molecular Sieving\nMembrane Fabrication and Applications for Dye Separation","volume":"8","author":"Divya","year":"2023","journal-title":"ChemistrySelect"},{"key":"2026090307174872400_cit6","doi-asserted-by":"publisher","first-page":"216121","DOI":"10.1016\/j.ccr.2024.216121","article-title":"Advances and Challenges in Covalent Organic Frameworks\nas an Emerging Class of Materials for Energy and Environmental Concerns","volume":"519","author":"Ampong","year":"2024","journal-title":"Coord. Chem. Rev."},{"issue":"10","key":"2026090307174872400_cit7","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202216675","article-title":"Ultramicroporous Covalent\nOrganic Framework Nanosheets with Functionality Pair for Membrane\nC2H2\/C2H4 Separation","volume":"62","author":"Li","year":"2023","journal-title":"Angew. Chem., Int. Ed."},{"issue":"49","key":"2026090307174872400_cit8","doi-asserted-by":"publisher","first-page":"2202751","DOI":"10.1002\/adma.202202751","article-title":"Maneuvering\nApplications of Covalent Organic Frameworks\nvia Framework-Morphology Modulation","volume":"34","author":"Karak","year":"2022","journal-title":"Adv. Mater."},{"key":"2026090307174872400_cit9","doi-asserted-by":"publisher","first-page":"133001","DOI":"10.1016\/j.cej.2021.133001","article-title":"Facile Manufacture\nof COF-Based Mixed\nMatrix Membranes for Efficient CO2 Separation","volume":"430","author":"Zhang","year":"2022","journal-title":"Chem. Eng. J."},{"key":"2026090307174872400_cit10","doi-asserted-by":"publisher","first-page":"122004","DOI":"10.1016\/j.seppur.2022.122004","article-title":"Recent Advances in\nDeveloping Mixed Matrix Membranes Based on Covalent\nOrganic Frameworks","volume":"301","author":"Wang","year":"2022","journal-title":"Sep. Purif. 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Technol."},{"key":"2026090307174872400_cit28","doi-asserted-by":"publisher","first-page":"117882","DOI":"10.1016\/j.memsci.2020.117882","article-title":"Preparation\nof High-Performance and\nPressure-Resistant Mixed Matrix Membranes for CO2\/H2 Separation by\nModifying COF Surfaces with the Groups or Segments of the Polymer\nMatrix","volume":"601","author":"Cao","year":"2020","journal-title":"J. Membr. Sci."},{"issue":"3","key":"2026090307174872400_cit29","doi-asserted-by":"publisher","first-page":"112695","DOI":"10.1016\/j.jece.2024.112695","article-title":"Tailored\nDesign of CO2-Selective Mixed-Matrix Membranes Using Nitrile-Functionalized\nCOFs as 2D Nanofillers","volume":"12","author":"Hoque","year":"2024","journal-title":"J. Environ. Chem. Eng."},{"issue":"1\u20132","key":"2026090307174872400_cit30","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/0376-7388(95)00102-I","article-title":"The Solution-Diffusion\nModel: A Review","volume":"107","author":"Wijmans","year":"1995","journal-title":"J. Membr. Sci."},{"issue":"48","key":"2026090307174872400_cit31","doi-asserted-by":"publisher","first-page":"19524","DOI":"10.1021\/ja308278w","article-title":"Construction of Crystalline\n2D Covalent Organic Frameworks\nwith Remarkable Chemical (Acid\/Base) Stability via a Combined Reversible\nand Irreversible Route","volume":"134","author":"Kandambeth","year":"2012","journal-title":"J. Am. Chem. Soc."},{"issue":"15","key":"2026090307174872400_cit32","doi-asserted-by":"publisher","DOI":"10.1002\/chem.202203907","article-title":"Green and\nFast Strategies for Energy-Efficient Preparation of the Covalent Organic\nFramework TpPa-1","volume":"29","author":"Marti\u0301nez-Visus","year":"2023","journal-title":"Chem.\u2500Eur. J."},{"issue":"11","key":"2026090307174872400_cit33","doi-asserted-by":"publisher","first-page":"3615","DOI":"10.1002\/macp.1994.021951109","article-title":"Effect of\nSolvent Evaporation Rate on Microphase-Separated Structure of Segmented\nPoly(Urethane-Urea) Prepared by Solution Casting","volume":"195","author":"Ikeda","year":"1994","journal-title":"Macromol. Chem. Phys."},{"key":"2026090307174872400_cit34","doi-asserted-by":"publisher","first-page":"76","DOI":"10.1016\/j.memsci.2011.09.024","article-title":"Study on the\nMorphology\nand Gas Permeation Property of Polyurethane Membranes","volume":"385\u2013386","author":"Sadeghi","year":"2011","journal-title":"J. Membr. Sci."},{"issue":"48","key":"2026090307174872400_cit35","doi-asserted-by":"publisher","first-page":"27495","DOI":"10.1021\/acs.jpcc.8b09033","article-title":"Understanding Water Adsorption and\nthe Impact on CO2 Capture in Chemically\nStable Covalent Organic Frameworks","volume":"122","author":"Ge","year":"2018","journal-title":"J. Phys.\nChem. C"},{"issue":"41","key":"2026090307174872400_cit36","doi-asserted-by":"publisher","first-page":"22577","DOI":"10.1021\/acs.jpcc.0c07062","article-title":"Computational Selection\nof High-Performing Covalent Organic Frameworks for Adsorption and\nMembrane-Based CO2\/H2 Separation","volume":"124","author":"Aksu","year":"2020","journal-title":"J. Phys. Chem.\nC"},{"issue":"30","key":"2026090307174872400_cit37","doi-asserted-by":"publisher","first-page":"8048","DOI":"10.1002\/chem.202100478","article-title":"CO2 Capture by Hydroxylated Azine-Based Covalent Organic\nFrameworks","volume":"27","author":"Maia","year":"2021","journal-title":"Chem.\u2500Eur. J."},{"issue":"6","key":"2026090307174872400_cit38","doi-asserted-by":"publisher","first-page":"1863","DOI":"10.1039\/C6EE00811A","article-title":"Advances\nin High Permeability Polymer-Based Membrane\nMaterials for CO2 Separations","volume":"9","author":"Wang","year":"2016","journal-title":"Energy Environ.\nSci."},{"issue":"1","key":"2026090307174872400_cit39","doi-asserted-by":"publisher","first-page":"390","DOI":"10.1016\/j.memsci.2008.04.030","article-title":"The Upper\nBound Revisited","volume":"320","author":"Robeson","year":"2008","journal-title":"J. Membr. 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CO2 Util."}],"container-title":["ACS Omega"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.acs.org\/doi\/pdf\/10.1021\/acsomega.6c06026","content-type":"application\/pdf","content-version":"vor","intended-application":"unspecified"},{"URL":"https:\/\/pubs.acs.org\/acsodf\/article-pdf\/11\/34\/51701\/66983861\/acsomega.6c06026.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.acs.org\/acsodf\/article-pdf\/11\/34\/51701\/66983861\/acsomega.6c06026.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T11:17:57Z","timestamp":1788434277000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.acs.org\/acsodf\/article\/11\/34\/51701\/5285401\/COF-RIO-18-Polyurethane-Mixed-Matrix-Membranes"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,8,21]]},"references-count":41,"journal-issue":{"issue":"34","published-online":{"date-parts":[[2026,8,21]]},"published-print":{"date-parts":[[2026,9,1]]}},"URL":"https:\/\/doi.org\/10.1021\/acsomega.6c06026","relation":{},"ISSN":["2470-1343"],"issn-type":[{"value":"2470-1343","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,8,21]]}}}