Insight into the aminosilane functionalized-montmorillonite/Pebax mixed matrix membranes with selectively fast gas transport channels for CO2 permeation

被引:2
作者
Jiang, Yu [1 ]
Wu, Yonghong [1 ]
Zhang, Bing [1 ]
机构
[1] Shenyang Univ Technol, Liaoning Prov Profess & Tech Innovat, Sch Petrochem Engn, Ctr Fine Chem Engn Aromat Downstream, 30 Guanghua St, Liaoyang 111003, Peoples R China
基金
中国国家自然科学基金;
关键词
Mixed matrix membrane; Pebax1074; Montmorillonite; CO; 2; separation; Aminosilane; SEPARATION PERFORMANCE; COMPOSITE MEMBRANES; NA-MONTMORILLONITE; GRAPHENE OXIDE; CO2/N-2; CO2/CH4; SILANE; CARBON; NANOCOMPOSITES; POLYIMIDES;
D O I
10.1016/j.colsurfa.2024.135142
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Mixed matrix membranes (MMMs) hold a great prospect for CO2 separation and capture. To further improve the separation efficiency, surface modification of fillers with organosilanes is an effective way to establish a link between polymers and fillers with respect to optimizing the interfacial morphology. In this study, MMMs were prepared using polyether-block-polyamide (Pebax) as a continuous matrix phase and aminosilane functionalizedmontmorillonite (K-MMT) as dispersive fillers. K-MMT plays multiple roles for modifying the structure and improving the performance of resultant MMMs. The introduction of K-MMT disrupts the hydrogen bonding between the hard segments and decreases the crystallinity of MMMs. Furthermore, the inner channels of K-MMT could provide high-speed facilitated gas transport passages, of which the structural metal cations further offer transport carriers so as to substantially increase the CO2 permeability. Moreover, K-MMT can positively capture CO2 in gas mixture on the dependence of the mobility of long-chain amino groups and the reversible reaction between CO2 and amine groups. Additionally, the introduction of 3-aminopropyl triethoxysilane tends to enlarge the structural interlayer spacings of MMT, resulting into the facilitated penetration of CO2 through resultant MMMs. In brief, the MMMs doped with 4 % K-MMT show the optimal gas separation, i.e., CO2 permeability of 196.4 Barrer and CO2/N2 2 /N 2 ideal selectivity of 162.4, which is far beyond the proposed 2019 upper bound for CO2/ 2 / N2 2 system.
引用
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页数:13
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