{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,1]],"date-time":"2026-11-01T03:34:10Z","timestamp":1793504050060,"version":"4.5.0"},"reference-count":52,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T00:00:00Z","timestamp":1759795200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the Science and Technology Innovation Project on Emission Peak and Carbon Neutrality of Jiangsu Province","award":["BK20220038"],"award-info":[{"award-number":["BK20220038"]}]},{"name":"the Science and Technology Innovation Project on Emission Peak and Carbon Neutrality of Jiangsu Province","award":["52170153"],"award-info":[{"award-number":["52170153"]}]},{"name":"the Science and Technology Innovation Project on Emission Peak and Carbon Neutrality of Jiangsu Province","award":["30925010505"],"award-info":[{"award-number":["30925010505"]}]},{"name":"the National Natural Science Foundation of China","award":["BK20220038"],"award-info":[{"award-number":["BK20220038"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"crossref"}]},{"name":"the National Natural Science Foundation of China","award":["52170153"],"award-info":[{"award-number":["52170153"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"crossref"}]},{"name":"the National Natural Science Foundation of China","award":["30925010505"],"award-info":[{"award-number":["30925010505"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"crossref"}]},{"name":"the Fundamental Research Funds for the Central Universities","award":["BK20220038"],"award-info":[{"award-number":["BK20220038"]}]},{"name":"the Fundamental Research Funds for the Central Universities","award":["52170153"],"award-info":[{"award-number":["52170153"]}]},{"name":"the Fundamental Research Funds for the Central Universities","award":["30925010505"],"award-info":[{"award-number":["30925010505"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Membranes"],"abstract":"<jats:p>Highly permeable and selective membranes are crucial for energy-efficient gas separation. Two-dimensional (2D) graphitic carbon nitride (g-C3N4) has attracted significant attention due to its unique structural characteristics, including ultra-thin thickness, inherent surface porosity, and abundant amine groups. However, the interfacial defects caused by poor compatibility between g-C3N4 and polymers deteriorate the separation performance of membrane materials. In this study, amino-functionalized g-C3N4 nanosheets (CN@PEI) was prepared by a post-synthesis method, then blended with the polymer Pebax to fabricate Pebax\/CN@PEI mixed matrix membranes (MMMs). Compared to g-C3N4, MMMs with CN@PEI loading of 20 wt% as nanofiller exhibited a CO2 permeance of 241 Barrer as well as the CO2\/CH4 and CO2\/N2 selectivity of 39.7 and 61.2, respectively, at the feed gas pressure of 2 bar, which approaches the 2008 Robeson upper bound and exceeded the 1991 Robeson upper bound. The Pebax\/CN@PEI (20) membrane showed robust stability performance over 70 h continuous gas permeability testing, and no significant decline was observed. SEM characterization revealed a uniform dispersion of CN@PEI throughout the Pebax matrix, demonstrating excellent interfacial compatibility between the components. The increased free volume fraction, enhanced solubility, and higher diffusion coefficient demonstrated that the incorporation of CN@PEI nanosheets introduced more CO2-philic amino groups and disrupted the chain packing of the Pebax matrix, thereby creating additional diffusion channels and facilitating CO2 transport.<\/jats:p>","DOI":"10.3390\/membranes15100306","type":"journal-article","created":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T15:48:30Z","timestamp":1759852110000},"page":"306","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Enhanced CO2 Separation Performance of Mixed Matrix Membranes with Pebax and Amino-Functionalized Carbon Nitride Nanosheets"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-9097-1958","authenticated-orcid":false,"given":"Mengran","family":"Hua","sequence":"first","affiliation":[{"name":"Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinqin","family":"Sun","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Na","family":"Li","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingchao","family":"Zhu","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0927-5727","authenticated-orcid":false,"given":"Yongze","family":"Lu","sequence":"additional","affiliation":[{"name":"School of Energy and Environment, Southeast University, Nanjing 210096, China"},{"name":"Key Laboratory of Water Pollution Control and Ecological Restoration of Xizang, National Ethnic Affairs Commission, Xizang Minzu University, Xianyang 712082, China"},{"name":"Information Engineer College, Xizang Minzu University, Xianyang 712082, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhaoxia","family":"Hu","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shouwen","family":"Chen","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,10,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"102260","DOI":"10.1016\/j.jcou.2022.102260","article-title":"Research progress on CO2 capture and utilization technology","volume":"66","author":"Fu","year":"2022","journal-title":"J. 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