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时间:2020-03-26
《多孔材料表面修饰聚酰亚胺非对称混合基质膜对CO2N2和CO2ICH4的气体分离.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学~E(WuliHuaxueXuebao)OctoberActa.一Chim.Sin.2015,31(10),1963—19701963【Article]doi:10.3866/PKU.WHXB201508282Ⅵw.whxb.pku.edu.crl多孔材料表面修饰聚酰亚胺非对称混合基质膜对CO2/N2和CO2ICH4的气体分离龚金华王臣辉卞子君阳立胡军刘洪来f华东理工大学化学与分子工程学院,上海200237)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
2、基底膜材料,分别在其表面修饰掺有金属有机框架材料cu。(BTC)(1,3,5一均苯三甲酸合铜),沸石咪唑酯骨架材料ZIF.8以及镁铝水滑~MgAI.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CO、CH和N:气体分离性能:考察TZIF一8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%(时COJN:~!ICOJCH的理想选择性分别高达24~U
3、83,为合成高效的CO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一8中图分类号:0646AsymmetricPolyimideMixedMatrixMembraneswithPorousMaterials-ModifiedSurfacesforCO2/N2andCO2/CH4SeparationsGONGJin—HuaWANGChen—HuiBIANZi—JunYANGLiHUJunLIUHong-Lai(SchoolofCP括andMolecularEngineering,EastChina
4、UniversityofScienceandTechnology,Shanghai200237,尸.R.China)Abstract:Membraneswithbothgoodpermeationandselectivityarehighlydesiredforgasseparations.Wesynthesizedapolyimide(PI)asymmetricmembraneusingthephase-inversionmethod,andthenmodifiedthesurfacewithamixtureofporou
5、sfillersandpoly(amicacid)(PAA).Theporousfillersincludedthemetalorganicframework(MOF)ofCu3(BTC)2(copperbenzene一1,3,5-ⅢcarboxyIate),thezeoliteimidazoleframework(ZIF)ofZIF-8,andtheporoushydrotalciteofMgAI·LDH.Aseriesofasymmetricmixed-matrixmembranes(MMMs)wereobtaineda
6、ftersurfacecoatingandthermalamidation.TheMMMstructure。CO2,CH4,andN2permeance.andtheidealgasselectivitywereinvestigated.Withthesurfacemodification,themorphologyofthesurfaceseparationlayersoftheasymmetricPI/ZIF一8,PI/LDH,andPI/Cu3(BTC)2MMMssignificantlychanged,andtheg
7、asseparationperformancechangedaccordingly.ThePI/ZIF-8asymmetricMMMwith5%(W)ZIF一8dopingexhibitedbothenhancedidealgasselectivityandpermeance;theCO2/N2andCO2/CH4selectMtywereashighas24and83,respectively.Thus,thissurfacemodificationprovidesimprovedMMMgasseparationperfo
8、rmance.KeyWords:Mixedmatrixmembrane;Gasseparation;Surfacemodification;Polyimide;ZIF一8Received:June12,2015;Revised:August28,2015;PublishedonWeb:Au
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