Zwitterionic functionalized “cage-like” porous organic frameworks for nanofiltration membrane with high efficiency water transport channels and anti-fouling property

Chongbin Wang, Zhiyuan Li, Jianxin Chen, Yunlong Zhong, Yongheng Yin, Li Cao, Hong Wu

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Nanofiltration membranes bearing high separation and anti-fouling performances represent an efficient separation technology for desalination applications. Although porous organic frameworks (POFs) are considered as a promising candidate for constructing membranes with improved water flux due to their unique advantages such as well-defined pores and tunable functionality, there is still challenge for anti-fouling property of the membranes. Zwitterions possessing balanced charge groups are very attractive for preparing anti-fouling membranes owe to their high hydration capacity. In this study, nanocomposite membranes were prepared by embedding the zwitterionic functionalized “cage-like” POFs (Z-PAF-C) into polyamide (PA) layer. The POFs blended within polymeric membranes could provide more and shorter channels for water molecules through the hybrid membranes, attributing to the novel porous structure of POFs. The zwitterionic groups derived from Z-PAF-C could enhance the hydrophilicity of membrane surface, rendering the membranes promising anti-fouling properties. The water flux of the membrane was increased distinctly from 24 L m−2 h−1 to 42.6 L m−2 h−1 under 0.2 MPa with the loading of Z-PAF-C ranged from 0 g/m2 to 0.85 g/m2 while the retention for Na2SO4 (1 g/L) was maintained at 90.6%. This study demonstrated that the introduction of the zwitterionic functionalized POFs can improve the hydrophilicity and charge negativity of membrane surface, resulting in an enhanced water flux and anti-fouling property.
Original languageEnglish (US)
Pages (from-to)194-202
Number of pages9
JournalJournal of Membrane Science
Volume548
DOIs
StatePublished - Feb 15 2018
Externally publishedYes

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Generated from Scopus record by KAUST IRTS on 2023-09-21

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