Effect of MIL-53 on phase inversion and gas separation performance of mixed matrix hollow fiber membranes. Issue 73 (20th July 2016)

• Record Type: Journal Article
• Authors: Zhu, Haitao; Jie, Xingming; Wang, Lina; Kang, Guodong; Liu, Dandan; Cao, Yiming
• Is Part Of: RSC advances. Volume 6:Issue 73(2016)
• Page Start: 69124
• Page End: 69134
• Publication Date: 2016-07-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra14823a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The MIL-53 non-solvent effect influenced the phase inversion of spinning dope, and the MOF-containing hollow fiber membrane structure was optimized. Abstract : In this paper the θ -composition for the Ultem®1000/NMP/EtOH ternary phase system was determined firstly and based on this, membranes with different non-solvent ratios (lower, slightly lower, and larger than the θ -composition) were prepared. It was found that dopes with a non-solvent ratio slightly lower than the θ -composition gave membranes the most attractive gas separation performance. Then the metal–organic framework (MOF) of MIL-53 was incorporated into Ultem®1000 to fabricate asymmetric mixed matrix hollow fiber membranes (MMHFMs). MIL-53, which was grouped with EtOH as a non-solvent, turned out to influence the phase inversion more significantly than EtOH did. Similar to the pure Ultem®1000 membrane, MMHFMs formed with the dopant close to the θ -condition for the Ultem®1000/MIL-53/NMP/EtOH phase system possessed the best permeation performance: MMHFMs with 5 wt% MIL-53 loading exhibited an O2 and CO2 permeance of 8.1 GPU and 27.9 GPU, an increase of 138% and 129% respectively compared with the pure Ultem membrane. Meanwhile, the O2 /N2 and CO2 /CH4 selectivity was almost unchanged. Moreover, the rule was also embodied in MMHFMs with different filler loadings. This study quantitatively revealed the pseudo non-solvent effect of MOFs, which offers an effective method for the fabrication of MMHFMs with a low MOF loading but high performance.