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- W3205827199 abstract "Positively charged nanofiltration membranes are promising in water softening and heavy metal ion removal. However, facile modulation on their chargeability remains a great challenge. Here, we proposed a charged-monomer-engineered interfacial polymerization toward positively charged polyamide membranes. In particular, branched amino macromolecules (BAMs) with different charged group numbers and molecular sizes were selected as aqueous monomers, allowing for wide-range-tunable membrane chargeability. We found that larger BAMs tend to form intramolecularly crosslinked networks with more amino residues, conferring membrane chargeability up to +5.53 mC m−2. Besides, the slower diffusion of larger BAMs also led to ultrathin membranes down to 9.0 nm in thickness. The optimal composite nanofiltration membrane displayed a high rejection to multivalent cations (e.g., MgCl2 rejection of 98.7%) with ultrahigh pure water permeance of 31.5 L m−2 h−1 bar−1, which was around 2–10 times higher than that of the reported positively charged nanofiltration membranes. Our monomer design strategy for interfacial polymerization may evolve into a facile approach to constructing advanced charged membranes." @default.
- W3205827199 created "2021-10-25" @default.
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- W3205827199 date "2022-02-01" @default.
- W3205827199 modified "2023-10-16" @default.
- W3205827199 title "Ultrathin polyamide nanofiltration membranes with tunable chargeability for multivalent cation removal" @default.
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- W3205827199 doi "https://doi.org/10.1016/j.memsci.2021.119971" @default.
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