期刊
MEMBRANES
卷 12, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/membranes12040402
关键词
divalent ion; graphene oxide; membrane; nanofiltration; reduction; crosslinking
类别
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2020R1C1C101317212]
In this study, the use of divalent cation crosslinking was attempted to improve the resistance against swelling in partially reduced GO membranes. It was found that the crosslinked membranes demonstrated improved dye rejection efficiency and mechanical stability.
Laminar graphene oxide (GO) membranes have demonstrated great potential as next-generation water-treatment membranes because of their outstanding performance and physicochemical properties. However, solute rejection and stability deterioration in aqueous solutions, which are caused by enlarged nanochannels due to hydration and swelling, are regarded as serious issues in the use of GO membranes. In this study, we attempt to use the crosslinking of divalent cations to improve resistance against swelling in partially reduced GO membranes. The partially reduced GO membranes intercalated by divalent cations (i.e., Mg2+) exhibited improved dye-rejection efficiencies of up to 98.40%, 98.88%, and 86.41% for methyl orange, methylene blue, and rhodamine B, respectively. In addition, it was confirmed that divalent cation crosslinking and partial reduction could strengthen mechanical stability during testing under harsh aqueous conditions (i.e., strong sonication).
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