Enhanced Mono/Divalent Ion Separation via Charged Interlayer Channels in Montmorillonite-Based Membranes.

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  • Additional Information
    • Source:
      Publisher: American Chemical Society Country of Publication: United States NLM ID: 0213155 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1520-5851 (Electronic) Linking ISSN: 0013936X NLM ISO Abbreviation: Environ Sci Technol Subsets: MEDLINE
    • Publication Information:
      Publication: Washington DC : American Chemical Society
      Original Publication: Easton, Pa. : American Chemical Society, c1967-
    • Subject Terms:
      Bentonite* ; Water Purification*/methods; Ions ; Filtration
    • Abstract:
      Efficient mono- and divalent ion separation is pivotal for environmental conservation and energy utilization. Two-dimensional (2D) materials featuring interlayer nanochannels exhibit unique water and ion transport properties, rendering them highly suitable for water treatment membranes. In this work, we incorporated polydopamine/polyethylenimine (PDA/PEI) copolymers into 2D montmorillonite (MMT) nanosheet interlayer channels through electrostatic interactions and bioinspired bonding. A modified laminar structure was formed on the substrate surface via a straightforward vacuum filtration. The electrodialysis experiments reveal that these membranes could achieve monovalent permselectivity of 11.06 and Na + flux of 2.09 × 10 -8 mol cm -2 s -1 . The enhanced permselectivity results from the synergistic effect of electrostatic and steric hindrance effect. In addition, the interaction between the PDA/PEI copolymer and the MMT nanosheet ensures the long-term operational stability of the membranes. Theoretical simulations reveal that Na + has a lower migration energy barrier and higher migration rate for the modified MMT-based membrane compared to Mg 2+ . This work presents a novel approach for the development of monovalent permselective membranes.
    • Contributed Indexing:
      Keywords: 2D channel; MMT nanosheet; electrodialysis; electrostatic effect; monovalent permselectivity
    • Accession Number:
      1302-78-9 (Bentonite)
      0 (Ions)
    • Publication Date:
      Date Created: 20240219 Date Completed: 20240306 Latest Revision: 20240306
    • Publication Date:
      20240306
    • Accession Number:
      10.1021/acs.est.3c08853
    • Accession Number:
      38373279