Enhancing selectivity of ZIF-8 membranes by short-duration postsynthetic ligand-exchange modification
文献类型：期刊论文
| 作者 | Lang, Lin1,2 ; Banihashemi, Fateme2; James, Joshua B.2; Miao, Jiansong2; Lin, Jerry Y. S.2
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| 刊名 | JOURNAL OF MEMBRANE SCIENCE
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| 出版日期 | 2021-02-01 |
| 卷号 | 619页码:8 |
| 关键词 | ZIF-8 membrane Membrane surface ligand exchange Membrane separation Selectivity Surface defects |
| ISSN号 | 0376-7388 |
| DOI | 10.1016/j.memsci.2020.118743 |
| 通讯作者 | Lin, Jerry Y. S.(jerry.lin@asu.edu) |
| 英文摘要 | 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. |
| WOS关键词 | IMIDAZOLATE FRAMEWORK MEMBRANES ; METAL-ORGANIC FRAMEWORKS ; POLYMERIC HOLLOW FIBERS ; PROPYLENE/PROPANE SEPARATION ; ZEOLITE MEMBRANES ; GROWTH ; FLEXIBILITY ; PERMEATION ; STABILITY |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000600296400002 |
| 出版者 | ELSEVIER |
| 资助机构 | National Science Foundation of the United States ; Guangdong Natural Science Foundation ; CAS |
| 源URL | [http://ir.giec.ac.cn/handle/344007/32376]  |
| 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.Chinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Guangzhou 510640, Peoples R China 2.Arizona State Univ, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA |
| 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. |
入库方式： OAI收割
来源：广州能源研究所
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