期刊
JOURNAL OF MEMBRANE SCIENCE
卷 523, 期 -, 页码 185-196出版社
ELSEVIER
DOI: 10.1016/j.memsci.2016.09.064
关键词
Two-dimensional ZIF-L; Zero-dimensional ZIF-8; Hybrid membrane; Sieving effect; Pervaporation dehydration
资金
- National Science Fund for Distinguished Young Scholars [21125627]
- National Natural Science Foundation of China [21490583, 21306131]
- Program of Introducing Talents of Discipline to Universities [B06006]
- State Key Laboratory of Chemical Engineering [SKL-ChE-14B03]
Two kinds of zeolitic imidazolate frameworks (two-dimensional ZIF-L nanosheets and zero-dimensional ZIF-8 nanoparticles) with the same building blocks were synthesized. Both the ZIF-L and ZIF-8 materials were incorporated into sodium alginate (SA) matrix to fabricate hybrid membranes for pervaporation dehydration of ethanol. At the filler content of 4 wt%, the ZIF-L-filled membrane displayed permeation flux of 1218 g/(m(2) h) and separation factor of 1840, while the ZIF-8-filled membrane displayed permeation flux of 879 g/(m(2) h) and separation factor of 678. The superior separation performance of the ZIF-L-filled membrane is due to the following two reasons: the ordered alignment and the regular apertures of ZIF-L rendered ordered water channels for rapid transport of water molecules; the suitable apertures of ZIF-L rendered the desirable molecular sieving effect. Furthermore, the hybrid membranes exhibited both good swelling resistance as well as thermal and mechanical stability. This is a step forward in realizing superior performance of hybrid membranes incorporating two-dimensional porous fillers for separation processes.
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