Synergistic of carbon nanotube/cyclodextrin metal organic framework for enhancing CO2 separation of mixed matrix membranes

被引：0

作者：

Pei R. ^{[1
]}

Wang Y. ^{[1
,2
]}

Zhang X. ^{[1
,2
]}

Li J. ^{[1
,2
]}

机构：

[1] College of Chemical Engineering and Technology, Taiyuan University of Technology, Shanxi, Taiyuan

[2] Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Shanxi, Taiyuan

来源：

Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 09期

关键词：

carbon nanotube; CO[!sub]2[!/sub]/N[!sub]2[!/sub] separation; mixed matrix membrane; sulfonated poly(ether ether ketone); β-cyclodextrin metal organic framework;

D O I：

10.11949/0438-1157.20220627

中图分类号：

学科分类号：

摘要：

To achieve the CO2 efficient separation in mixed matrix membranes (MMMs), a dual-filler (CM) of carboxyl modified multi-walled carbon nanotubes (CNT) and amino modified β -cyclodextrin metal organic framework (β-CD MOF) was designed and introduced to sulfonated poly(ether ether ketone) (SPEEK) to construct both CO2 diffusion channels and affinity sites within the membranes, which enhanced the separation performance of MMMs. The chemical and pore structures of the dual-filler were characterized by FTIR and BET, and the filler-polymer interfacial interactions were verified by SEM, FTIR and mechanical properties of the membranes. The effects of the proportion, content, pressure, temperature and mixed gas on the separation performance of MMMs were investigated. The results showed that CM was compatible with SPEEK and provided fast transport channels for gas molecules. The SPEEK/CM-7 MMMs with mass ratio of 5∶5 displayed the optimal separation performance with a CO2 permeability of 844 Barrer and a CO2/N2 selectivity of 84 at 0.1 MPa and 25℃, which were 178% and 163% higher than those of the pristine SPEEK membrane, respectively, surpassing the 2019 upper bound. The straight pore channels of functional CNT shortened the CO2 diffusion path, while the amino carriers on the surface of modified MOF enhanced the CO2 dissolution, which synergistically improved the separation performance of MMMs. Moreover, the membranes loaded with dual-filler had preferable separation performance than those loaded with the same amount of carboxyl modified CNT or amino modified MOF alone. During 360 h testing, the SPEEK/CM-7 MMMs remained good stability. © 2022 Chemical Industry Press. All rights reserved.

引用

页码：3904 / 3914

页数：10

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