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- W3201311532 endingPage "119692" @default.
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- W3201311532 abstract "High permeance membranes selective towards small ions and solutes are required to produce high-quality product water. Conventional semi-aromatic polyamide thin-film composite (TFC) nanofiltration membranes prepared via interfacial polymerization of diamine, e.g., piperazine (PIP) and acid chloride, do not show the precise separation of small solutes (<200 Da). To achieve this, we introduced an aromatic diamine group, e.g., m-phenylenediamine (MPD), within the semi-aromatic polyamide structure to achieve selective separation between small solutes with enhanced permeation upon solvent activation. Herein, we report the fabrication of polyamide nanofilm composite membranes using a mixture of PIP and MPD as a diamine precursor and react with trimesoyl chloride (TMC) on top of the ultrafiltration (UF) supports. Nanofilm composite membranes prepared with 1.0 wt% PIP and 0.1 wt% MPD on crosslinked polyimide (XP84) UF support show a seven times higher selectivity of ∼ 59.0 between glycerol and glucose than the conventional nanofiltration membranes (selectivity of ∼ 8.2). Membranes also show a ∼ 55.8% increase in pure water permeance (PWP) with identical Na2SO4 rejection (99.27% – 99.53%) and an increased selectivity between NaCl to Na2SO4 (from 43.7 to 98.9) after solvent activation with DMF. Additionally, after solvent activation, mixed-diamine-based nanofilm composite membranes show a sharp and reduced molecular weight cut-off (MWCO ∼ 170 Da) compared to the nanofiltration membranes prepared from semi-aromatic polyamide. The permeation results conducted with small neutral solutes in the aqueous feed suggest the existence of pores of mean size ∼ 13.0 Å, with an enhancement of pore sizes ∼ 7 – 22.6% after DMF activation. The process of membrane fabrication is acceptable for large-scale manufacturing." @default.
- W3201311532 created "2021-09-27" @default.
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- W3201311532 date "2021-12-01" @default.
- W3201311532 modified "2023-10-10" @default.
- W3201311532 title "Precise separation of small neutral solutes with mixed-diamine-based nanofiltration membranes and the impact of solvent activation" @default.
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- W3201311532 doi "https://doi.org/10.1016/j.seppur.2021.119692" @default.
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