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- W2026600442 abstract "Membrane technology has become a low-cost and high-efficiency separation technology for industrial processes over the past decennia. The colloidal route is an environmentally benign process for the preparation of ceramic membranes by using water as solvent. A stable, colloidal boehmite sol with an average particle size of 16 nm was prepared from aluminum tri-sec-butoxide using water as a solvent in the pH range of 3–4. Acetic acid was used as the peptizing agent instead of nitric acid. The stable sol was used to fabricate γ-alumina nanofiltration membranes on α-alumina microfiltration substrates by a dip-coating approach. The effects of the peptizing agents on the properties of the sols and the membranes were investigated. γ-alumina nanofiltration membranes with an average membrane thickness of 1.8 μm were obtained after sintered at 600 °C for 2 h. The molecular weight cut-off of the γ-alumina nanofiltration membranes, as obtained by filtration of an aqueous PEG solution, was approximately 1 kDa. This membrane also showed a typical retention for monovalent ions and divalent ions. Additionally, the nanofiltration membranes exhibited a relatively high pure-water flux (>20 L/(m2 h bar)), which is four times higher than that of the γ-alumina nanofiltration membranes reported in the literature. The contribution ratios of different microstructure factors on pure-water flux were calculated. The change in tortuosity with a contribution ratio of 75.6% was the main factor for the improvement of pure-water flux." @default.
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- W2026600442 date "2015-09-01" @default.
- W2026600442 modified "2023-09-29" @default.
- W2026600442 title "Preparation of high-flux γ-alumina nanofiltration membranes by using a modified sol–gel method" @default.
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- W2026600442 doi "https://doi.org/10.1016/j.micromeso.2015.04.027" @default.
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