多孔材料表面修饰聚酰亚胺非对称混合基质膜对CO2/N2和CO2/CH4的气体分离

doi:10.3866/PKU.WHXB201508282

物理化学学报 >> 2015, Vol. 31 >> Issue (10): 1963-1970.doi: 10.3866/PKU.WHXB201508282

多孔材料表面修饰聚酰亚胺非对称混合基质膜对CO₂/N₂和CO₂/CH₄的气体分离

龚金华,王臣辉,卞子君,阳立,胡军*(),刘洪来

华东理工大学化学与分子工程学院,上海200237

收稿日期:2015-06-12 发布日期:2015-10-10
通讯作者: 胡军 E-mail:junhu@ecust.edu.cn
基金资助:
国家重点基础研究发展规划项目(973)(2013CB733501);国家自然科学基金项目(91334203, 21376074)

Asymmetric Polyimide Mixed Matrix Membranes with Porous Materials-Modified Surfaces for CO₂/N₂ and CO₂/CH₄ Separations

Jin-Hua. GONG,Chen-Hui. WANG,Zi-Jun. BIAN,Li. YANG,Jun. HU*(),Hong-Lai. LIU

School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

Received:2015-06-12 Published:2015-10-10
Contact: Jun. HU E-mail:junhu@ecust.edu.cn
Supported by:
the National Key Basic Research Program of China (973)(2013CB733501);National Natural Science Foundationof China(91334203, 21376074)

摘要/Abstract

摘要：

兼具高通量和高选择性的气体分离膜是研究膜分离材料的目标.采用相转化法制备了聚酰亚胺非对称膜,并将其作为基底膜材料,分别在其表面修饰掺有金属有机框架材料Cu₃(BTC)₂ (1, 3, 5-均苯三甲酸合铜),沸石咪唑酯骨架材料ZIF-8以及镁铝水滑石MgAl-LDHs的聚酰胺酸溶液,经热亚胺化后制成非对称混合基质膜.研究了该系列非对称混合基质膜的结构特性和对CO₂、CH₄和N₂气体分离性能;考察了ZIF-8的掺杂量对非对称混合基质膜透气性能的影响.结果表明非对称聚酰亚胺膜的表面修饰可有效地改变膜的表面性质,掺杂ZIF-8的非对称混合基质膜气体的透气性能和选择性都增加,且掺杂量为5% (w)时CO₂/N₂和CO₂/CH₄的理想选择性分别高达24和83,为合成高效的CO₂分离膜提供了借鉴.

关键词: 混合基质膜, 气体分离, 表面修饰, 聚酰亚胺, ZIF-8

Abstract:

Membranes with both good permeation and selectivity are highly desired for gas separations. We synthesized a polyimide (PI) asymmetric membrane using the phase-inversion method, and then modified the surface with a mixture of porous fillers and poly(amic acid) (PAA). The porous fillers included the metal organic framework (MOF) of Cu₃(BTC)₂ (copper benzene-1, 3, 5-tricarboxylate), the zeolite imidazole framework (ZIF) of ZIF-8, and the porous hydrotalcite of MgAl-LDH. A series of asymmetric mixed-matrix membranes (MMMs) were obtained after surface coating and thermal amidation. The MMM structure, CO₂, CH₄, and N₂ permeance, and the ideal gas selectivity were investigated. With the surface modification, the morphology of the surface separation layers of the asymmetric PI/ZIF-8, PI/LDH, and PI/Cu₃(BTC)₂ MMMs significantly changed, and the gas separation performance changed accordingly. The PI/ZIF-8 asymmetric MMM with 5% (w) ZIF-8 doping exhibited both enhanced ideal gas selectivity and permeance; the CO₂/N₂ and CO₂/CH₄ selectivity were as high as 24 and 83, respectively. Thus, this surface modification provides improved MMM gas separation performance.

Key words: Mixed matrix membrane, Gas separation, Surface modification, Polyimide, ZIF-8

龚金华,王臣辉,卞子君,阳立,胡军,刘洪来. 多孔材料表面修饰聚酰亚胺非对称混合基质膜对CO₂/N₂和CO₂/CH₄的气体分离[J]. 物理化学学报, 2015, 31(10): 1963-1970.

Jin-Hua. GONG,Chen-Hui. WANG,Zi-Jun. BIAN,Li. YANG,Jun. HU,Hong-Lai. LIU. Asymmetric Polyimide Mixed Matrix Membranes with Porous Materials-Modified Surfaces for CO₂/N₂ and CO₂/CH₄ Separations[J]. Acta Phys. -Chim. Sin., 2015, 31(10): 1963-1970.

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201508282

https://www.whxb.pku.edu.cn/CN/Y2015/V31/I10/1963

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多孔材料表面修饰聚酰亚胺非对称混合基质膜对CO₂/N₂和CO₂/CH₄的气体分离

Asymmetric Polyimide Mixed Matrix Membranes with Porous Materials-Modified Surfaces for CO₂/N₂ and CO₂/CH₄ Separations

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