文献类型：期刊文献

中文题名：多孔材料表面修饰聚酰亚胺非对称混合基质膜对CO_2/N_2和CO_2/CH_4的气体分离

英文题名：Asymmetric Polyimide Mixed Matrix Membranes with Porous MaterialsModified Surfaces for CO_2/N_2 and CO_2/CH_4 Separations

作者：龚金华[1];王臣辉[1];卞子君[1];阳立[1];胡军[1];刘洪来[1]

机构：[1]华东理工大学化学与分子工程学院,上海200237

年份：2015

卷号：31

期号：10

起止页码：1963

中文期刊名：物理化学学报

外文期刊名：Acta Physico-Chimica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000363712300015)】；北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；PubMed;

基金：The project was supported by the National Key Basic Research Program of China (973) (2013CB733501) and National Natural Science Foundation of China (91334203, 21376074).

语种：中文

中文关键词：混合基质膜;气体分离;表面修饰;聚酰亚胺;ZIF-8

外文关键词：Mixed matrix membrane; Gas separation; Surface modification; Polyimide; ZIF-8;

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Mg Al-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.
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 Mg Al-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.