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

引用本文: 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. doi: 10.3866/PKU.WHXB201508282 shu

Citation: NG Jin-Hua, WANG Chen-Hui, BIAN Zi-Jun, YANG Li, HU Jun, LIU Hong-Lai. Asymmetric Polyimide Mixed Matrix Membranes with Porous Materials-Modified Surfaces for CO₂/N₂ and CO₂/CH₄ Separations[J]. Acta Physico-Chimica Sinica, 2015, 31(10): 1963-1970. doi: 10.3866/PKU.WHXB201508282 shu

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

基金项目:
国家重点基础研究发展规划项目(973) (2013CB733501) (973) (2013CB733501)

国家自然科学基金项目(91334203, 21376074)资助 (91334203, 21376074)

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:

English

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

1.
School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
Received Date: 12 June 2015
Available Online: 10 October 2015
Fund Project:
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)资助

Abstract:

Membranes with both od 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:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

English

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

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