A low-pressure GO nanofiltration membrane crosslinked via ethylenediamine

Na Meng, Wang Zhao, Ezzatollah Shamsaei, Gen Wang, Xiangkang Zeng, Xiaocheng Lin, Tongwen Xu, Huanting Wang, Xiwang Zhang

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34 Citations (Scopus)

Abstract

Laminate graphene oxide (GO) membranes have received increasing attention recently in the water processing field due to their unique properties. However, the hydration of hydrophilic graphene oxide nanosheets leads to instability of GO membranes in aqueous solutions. In this study, ethylenediamine (EDA) was employed to crosslink GO nanosheets in a GO membrane supported on a brominated polyphenylene oxide (BPPO). In addition, because the O˭C-OH group of GO reacted with the amine group of EDA, the GO layer was firmly bonded to the BPPO substrate, as evidenced by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). EDA crosslinking dramatically improved the stability of the GO membranes. After immersion in water for one month, the prepared BPPO/EDA/GO membranes still retained their flux rates and salt rejection capabilities. The water flux rates and salt rejection capabilities of BPPO/EDA/GO membranes can be tuned by controlling GO loading. At a GO loading of 65 mg/m2, the BPPO/EDA/GO membrane achieved a relatively high water flux rate of 4.1 L/m2 h under a very low transmembrane pressure of 1 bar. Additionally, the salt rejection percentages of Na2SO4, MgSO4 and NaCl were 56.2%, 48% and 36.3%, respectively. Moreover, the BPPO/EDA/GO membrane displayed good antifouling and antibacterial properties.

Original languageEnglish
Pages (from-to)363-371
Number of pages9
JournalJournal of Membrane Science
Volume548
DOIs
Publication statusPublished - 15 Feb 2018

Keywords

  • BPPO
  • Covalent bonding
  • GO nanosheets
  • Membrane Stability

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