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- W4293083710 abstract "High‐precision separation with increased water permeability is critical for efficient membrane‐based water treatment processes. To achieve high selectivity toward different targeted species while allowing rapid water transportation, the structure of the membrane polyamide selective layer requires delicate regulation. Herein, an effective approach to systematically expand the pore size of polyamide layers by incorporating ammonium ion‐modified carbon dots (CDs) into the polyamide network is developed. The ammonium ions with different alkyl chain lengths attached to the CDs create nanochannels of different sizes in the network to lower the energy barrier for water transportation while maintaining high selectivity to targeted species. When the alkyl chain length of the ammonium ions reaches eight carbon atoms (i.e., C 8 ions), the amphiphilic C 8 ‐CDs induce the formation of the ridged nanostructure on the membrane surface and hence the increased membrane filtration area. The resultant thin‐film nanocomposite (TFN) membrane, denoted as the TFN‐C 8 ‐CDs membrane, demonstrates a higher Na 2 SO 4 rejection of 98.9% and NaCl/Na 2 SO 4 selectivity of 83.1 than the pristine polyamide membrane, together with a tripled pure water permeability of 29.0 L m −2 h −1 bar −1 . Herein, a viable approach for ingeniously designing the nanochannels and surface nanostructure of polyamide membranes for more efficient filtration processes is provided." @default.
- W4293083710 created "2022-08-26" @default.
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- W4293083710 date "2022-06-11" @default.
- W4293083710 modified "2023-10-16" @default.
- W4293083710 title "High‐Precision and High‐Flux Separation by Rationally Designing the Nanochannels and Surface Nanostructure of Polyamide Nanofiltration Membranes" @default.
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- W4293083710 doi "https://doi.org/10.1002/smsc.202200026" @default.
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