High-Performance PEBA2533-Functional MMT Mixed Matrix Membrane Containing High-Speed Facilitated Transport Channels for CO2/N2 Separation

详细信息    查看全文

• 作者：Liangliang Dong ; Chunfang Zhang ; Yunxiang Bai ; Dongjian Shi ; Xiaojie Li ; Hongji Zhang ; Mingqing Chen
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：June 6, 2016
• 年：2016
• 卷：4
• 期：6
• 页码：3486-3496
• 全文大小：665K
• 年卷期：0
• ISSN：2168-0485

文摘

A novel mixed matrix membrane was fabricated by establishing montmorillonite (MMT) functionalized with poly(ethylene glycol) methyl ether (PEG) and aminosilane coupling agents in a PEBA membrane. The functional MMT played multiple roles in enhancing membrane performance. First, the MMT channels could be used as high-speed facilitated transport channels, in which the movable metal cations acted as carriers of CO₂ to increase the CO₂ permeability. Second, due to mobility of long-chain aminos and reversible reactions between CO₂ and amine groups, the functional MMT could actively catch the CO₂, not passively wait for arrival of CO₂, which can facilitate the CO₂ transport. At last, PEG consisting of EO groups had excellent affinity for CO₂ to enhance the CO₂/N₂ selectivity. Thus, the as-prepared functional MMMs exhibited good CO₂ permeability and CO₂/N₂ selectivity. The functional MMM doped with 40 wt % of MMT-HD702-PEG5000 displayed optimal gas separation with a CO₂ permeability of 448.45 Barrer and a CO₂/N₂ selectivity of 70.73, surpassing the upper bound lines of the Robeson study of 2008.