Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| Enhancing selectivity of ZIF-8 membranes by short-duration postsynthetic ligand-exchange modification | |
Lang, Lin1,2 ; Banihashemi, Fateme1; James, Joshua B.1; Miao, Jiansong1; Lin, Jerry Y. S.1
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| 2021-02-01 | |
| Source Publication | JOURNAL OF MEMBRANE SCIENCE
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| ISSN | 0376-7388 |
| Volume | 619Pages:8 |
| Corresponding Author | Lin, Jerry Y. S.(jerry.lin@asu.edu) |
| Abstract | 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. |
| Keyword | ZIF-8 membrane Membrane surface ligand exchange Membrane separation Selectivity Surface defects |
| DOI | 10.1016/j.memsci.2020.118743 |
| WOS Keyword | IMIDAZOLATE FRAMEWORK MEMBRANES ; METAL-ORGANIC FRAMEWORKS ; POLYMERIC HOLLOW FIBERS ; PROPYLENE/PROPANE SEPARATION ; ZEOLITE MEMBRANES ; GROWTH ; FLEXIBILITY ; PERMEATION ; STABILITY |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Science Foundation of the United States[CBET-1511005] ; Guangdong Natural Science Foundation[2020A1515011568] ; CAS[2016-161] |
| WOS Research Area | Engineering ; Polymer Science |
| Funding Organization | National Science Foundation of the United States ; Guangdong Natural Science Foundation ; CAS |
| WOS Subject | Engineering, Chemical ; Polymer Science |
| WOS ID | WOS:000600296400002 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/32377 |
| Collection | 中国科学院广州能源研究所 |
| Corresponding Author | Lin, Jerry Y. S. |
| Affiliation | 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 |
| First Author Affilication | GuangZhou Institute of Energy Conversion,Chinese Academy of Sciences |
| Recommended Citation 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. |
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