Enhancing the Dye-Rejection Efficiencies and Stability of Graphene Oxide-Based Nanofiltration Membranes via Divalent Cation Intercalation and Mild Reduction

Membranes

Kyu-Jung Chae¹  Tasnim Eisa¹  Euntae Yang²  Hobin Jee²  Jaewon Jang³  In S. Kim⁴  Yesol Kang⁴ 

[1] Department of Environmental Engineering, Korea Maritime and Ocean University, Busan 49112, Korea;Department of Marine Environmental Engineering, Gyeongsang National University, Tongyoung 53064, Korea;KEPCO Research Institute (KEPRI), Korea Electric Power Corporation (KEPCO), Naju 58277, Korea;School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea;

关键词: divalent ion;    graphene oxide;    membrane;    nanofiltration;    reduction;    crosslinking;   

DOI  :  10.3390/membranes12040402

来源: DOAJ

【 摘 要 】

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).

【 授权许可】

Unknown