Covalent Organic Framework Nanosheets as Reactive Fillers to Fabricate Free-Standing Polyamide Membranes for Efficient Desalination

Niaz Ali Khan, Niaz Ali Khan, Niaz Ali Khan, Jinqiu Yuan, Jinqiu Yuan, Hong Wu, Hong Wu, Hong Wu, Tong Huang, Tong Huang, Xinda You, Xinda You, Ata Ur Rahman, Chandra S. Azad, Mark A. Olson, Mark A. Olson, Zhongyi Jiang, Zhongyi Jiang

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Mixed matrix membranes (MMMs) have been increasingly utilized in membrane processes. Covalent organic frameworks (COFs) hold great promise as emergent nanofillers to fabricate high-performance MMMs; however, only few studies about COF materials in MMMs have been reported where COFs are all used as nonreactive fillers. Herein, we propose using -NH2-functionalized COF nanosheets as reactive fillers (rCON) to fabricate MMMs. rCON altered the morphology and chemistry of MMMs by controlling the diffusion rate of piperazine through hydrogen bonding prior to the interfacial polymerization process and inducing the creation of ridges in the MMMs with subsequent increase in surface area (∼24%). rCON was chemically cross-linked to the trimesoyl chloride through amide bonding, subsequently elevating the hydrophilicity (∼35%) and fouling resistance of MMMs. The presence of -NH2 groups elevated the rCON-PA compatibility, ensuring the high rCON loading of 5 wt % in the MMMs without sacrificing salt rejection. Accordingly, the PA-rCON MMMs exhibited a flux of 46.5 L m-2 h-1 bar-1, which is 6.8 times higher than that of the pristine PA membrane, with a high rejection rate of 93.5% for Na2SO4.

Original languageEnglish (US)
Pages (from-to)27777-27785
Number of pages9
JournalACS Applied Materials and Interfaces
Volume12
Issue number24
DOIs
StatePublished - Jun 17 2020
Externally publishedYes

Keywords

  • covalent organic framework nanosheets
  • desalination
  • interfacial polymerization
  • mixed matrix membranes
  • reactive fillers

ASJC Scopus subject areas

  • Materials Science(all)

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