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- W2983204675 abstract "Effective extraction of lithium from high Mg2+/Li+ ratio brine lakes is of great challenge. In this work, organic–inorganic hybrid silica nanofiltration (NF) membranes were prepared by dip-coating a 1,2-bis(triethoxysilyl)ethane (BTESE)-derived separation layer on tubular TiO2 support, for efficient separation of LiCl and MgCl2 salt solutions. We found that the membrane calcinated at 400 °C (M1–400) could exhibit a narrow pore size distribution (0.63–1.66 nm) owing to the dehydroxylation and the thermal degradation of the organic bridge groups. All as-prepared membranes exhibited higher rejections to LiCl than to MgCl2, which was attributed to the negative charge of the membrane surfaces. The rejection for LiCl and MgCl2 followed the order: LiCl > MgCl2, revealing that Donnan exclusion effect dominated the salt rejection mechanism. In addition, the triple-coated membrane calcined at 400 °C (M3–400) exhibited a permeability of about 9.5 L ∙ m−2 ∙ h−1 ∙ bar−1 for LiCl or MgCl2 solutions, with rejections of 74.7% and 20.3% to LiCl and MgCl2, respectively, under the transmembrane pressure at 6 bar. Compared with the previously reported performance of NF membranes for Mg2+/Li+ separation, the overall performance of M3–400 is highly competitive. Therefore, this work may provide new insight into designing robust silica-based ceramic NF membranes with negative charge for efficient lithium extraction from salt lakes." @default.
- W2983204675 created "2019-11-22" @default.
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- W2983204675 date "2020-03-01" @default.
- W2983204675 modified "2023-10-14" @default.
- W2983204675 title "Negatively charged organic–inorganic hybrid silica nanofiltration membranes for lithium extraction" @default.
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- W2983204675 doi "https://doi.org/10.1016/j.cjche.2019.11.004" @default.
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