Enhanced water permeance of a polyamide thin-film composite nanofiltration membrane with a metal-organic framework interlayer
Enhanced water permeance of a polyamide thin-film composite nanofiltration membrane with a metal-organic framework interlayer
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金属有机骨架夹层聚酰胺薄膜复合纳滤膜的增强透水性能
DOI：
10.1016/j.memsci.2021.119154
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发表时间：
2021-02
影响因子：
9.5
通讯作者：
Zhang Hongwei
中科院分区：
文献类型：
--
作者：
Zhao Bin;Guo Zhiqiang;Wang Hongli;Wang Liang;Qian Yiran;Long Xingli;Ma Cong;Zhang Zhaohui;Li Junjing;Zhang Hongwei
在多孔基底和聚酰胺（PA）膜之间构建中间层是克服渗透性和选择性之间普遍存在的权衡的有效策略，渗透性和选择性都是纳滤性能的重要性质。本研究采用聚苯乙烯磺酸钠（PSS）辅助界面合成法在PA膜和聚醚砜（PES）微孔膜之间制备了咪唑骨架8（ZIF-8）分子筛中间层。将PSS添加到含Zn 2+的水溶液中能够稳定在水/正己烷界面处形成的ZIF-8层，并且有利于ZIF-8在基底上的均匀负载，有效覆盖大孔。负载ZIF-8的PES膜的表面变得更光滑且带更多负电荷，从而为界面聚合提供改善的条件以形成薄、松散且无缺陷的PA膜。含有改性ZIF-8中间层的TFC膜的纯水渗透率为9.6 L m-2 h-1·bar-1，是原始TFC膜的两倍。同时，其对硫酸钠、罗丹明B和酸性品红的截留率保持良好。通过PSS辅助界面合成法引入ZIF-8中间层是一种很有前途的制备高性能水处理纳滤膜的技术。
Constructing an interlayer between porous substrate and polyamide (PA) film is an effective strategy to overcome the ubiquitous trade-off between permeability and selectivity, which are both important properties for nanofiltration performance. In this study, a poly(sodium 4-styrenesulfonate) (PSS) assisted interfacial synthesis method was proposed to fabricate a zeolitic imidazolate framework-8 (ZIF-8) interlayer between the PA film and microporous poly(ether sulfone) (PES) membrane. The addition of PSS to Zn2+containing aqueous solution was able to stabilize the ZIF-8 layer formed at the water/n-hexane interface and benefited the homogeneous loading of ZIF-8 on the substrate with effective coverage of the macrovoids. The surface of ZIF-8 loaded PES membrane became smoother and more negatively charged, providing improved conditions for interfacial polymerization to form a thin, loose, and defect-free PA film. The pure water permeance of the TFC membrane containing modified ZIF-8 interlayer was 9.6 L m-2h-1·bar-1, twice that of the pristine TFC membrane. Meanwhile, its rejection of sodium sulfate, rhodamine B, and acid fuchsin was well maintained. The introduction of ZIF-8 interlayer via the PSS assisted interfacial synthesis method was a promising technique to fabricate high-performance NF membrane for water treatment.
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