Enhancing selectivity of ZIF-8 membranes by short-duration postsynthetic ligand-exchange modification

doi:10.1016/j.memsci.2020.118743

GIEC OpenIR

	Enhancing selectivity of ZIF-8 membranes by short-duration postsynthetic ligand-exchange modification
	Lang, Lin1,2 ; Banihashemi, Fateme 1; James, Joshua B.1; Miao, Jiansong 1; Lin, Jerry Y. S.1
	2021-02-01
发表期刊	JOURNAL OF MEMBRANE SCIENCE
ISSN	0376-7388
卷号	619 页码:8
通讯作者	Lin, Jerry Y. S.(jerry.lin@asu.edu)
摘要	Post-synthesis modification of zeolitic imidazolate framework (ZIF) membranes offers new opportunities to tailor ZIF structures and improve their separation performance. This work utilizes membrane surface ligand exchange (MSLE) to replace methylimidazole (MeIM) with 5,6-dimethylbenzimidazole (DBIM) and investigates its effect on the gas separation properties of ZIF-8 membranes containing varying amounts of intercrystalline defects (perfect and imperfect membranes). Upon short time (0.5 h) MSLE modification, the pristine ZIF-8 membrane shows a significant enhancement in H-2/C2H6 selectivity (12-22) and C3H6/C3H8 selectivity (150-188) with small declines in gas permeance (29.5% for H-2, 6.5% for C3H6). MSLE modification also improves the separation performance of imperfect ZIF-8 membranes, but to a lesser extent (C3H6/C3H8 selectivity increasing from 37.5 to 63.3). Some of the MeIM in the ZIF-8 membrane crystals are replaced by bulkier DBIM, facilitated by the presence of the intercrystalline pores resulting in more exchange on the imperfect membrane. The short-duration ligand exchange reduces intracrystalline pore diffusivity, to a greater extent for larger molecules as compared to smaller molecules, leading to a reduction in gas permeance and an increase in separation factor. However, long- duration (5 h) MSLE modification on a perfect ZIF-8 membrane lowers the C3H6/C3H8 selectivity due to an increase in the intercrystalline transport for bulkier C3H8 with an increase in C3H6 permeance due to enhanced solubility within the modified ZIF-8 structure.
关键词	ZIF-8 membrane Membrane surface ligand exchange Membrane separation Selectivity Surface defects
DOI	10.1016/j.memsci.2020.118743
关键词[WOS]	IMIDAZOLATE FRAMEWORK MEMBRANES ; METAL-ORGANIC FRAMEWORKS ; POLYMERIC HOLLOW FIBERS ; PROPYLENE/PROPANE SEPARATION ; ZEOLITE MEMBRANES ; GROWTH ; FLEXIBILITY ; PERMEATION ; STABILITY
收录类别	SCI
语种	英语
资助项目	National Science Foundation of the United States[CBET-1511005] ; Guangdong Natural Science Foundation[2020A1515011568] ; CAS[2016-161]
WOS研究方向	Engineering ; Polymer Science
项目资助者	National Science Foundation of the United States ; Guangdong Natural Science Foundation ; CAS
WOS类目	Engineering, Chemical ; Polymer Science
WOS记录号	WOS:000600296400002
出版者	ELSEVIER
引用统计	被引频次：26[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/32377
专题	中国科学院广州能源研究所
通讯作者	Lin, Jerry Y. S.
作者单位	1.Arizona State Univ, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Guangzhou 510640, Peoples R China
第一作者单位	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	Lang, Lin,Banihashemi, Fateme,James, Joshua B.,et al. Enhancing selectivity of ZIF-8 membranes by short-duration postsynthetic ligand-exchange modification[J]. JOURNAL OF MEMBRANE SCIENCE,2021,619:8.
APA	Lang, Lin,Banihashemi, Fateme,James, Joshua B.,Miao, Jiansong,&Lin, Jerry Y. S..(2021).Enhancing selectivity of ZIF-8 membranes by short-duration postsynthetic ligand-exchange modification.JOURNAL OF MEMBRANE SCIENCE,619,8.
MLA	Lang, Lin,et al."Enhancing selectivity of ZIF-8 membranes by short-duration postsynthetic ligand-exchange modification".JOURNAL OF MEMBRANE SCIENCE 619(2021):8.