کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
633958 | 1456045 | 2014 | 7 صفحه PDF | دانلود رایگان |
• The nanofibrous composite membranes were fabricated from CA nanofiber dispersions.
• The nanofiber dispersions were prepared by freeze-extracting dilute CA solutions.
• The nanofibrous layers with a controllable thickness have porosity of up to 71%.
• The membranes show an excellent ferritin rejection and an ultrahigh water flux.
• The membranes exhibit a great potential application in pressure-driven filtration.
Ultrafiltration is widely used in waste water treatment and has become more crucial with increasing concerns in the living environment. Here we demonstrate a facile method to prepare 10 nm-diameter cellulose acetate (CA) nanofiber dispersions from very dilute CA solutions via freeze-extraction, and further fabricate nanofibrous composite membranes for ultrafiltration. The nanofibrous composite membranes are fabricated by directly filtering the dispersions on a CA microfiltration membrane (support), on which an ultrathin free-standing nanofibrous layer is formed. This layer, acting as a separation layer, has a uniform porous structure and ultrahigh porosity of up to 71%. The as-prepared membranes present ultrahigh water permeability and high efficient separation performance for ultrafiltration. The membrane with a 458 nm-thick nanofibrous layer has ferritin rejection of 90.7% and water flux of 3540 l m−2 h−1 bar−1 that is almost 10 times greater than that of most commercial membranes. These newly developed CA nanofibrous composite membranes have a great potential application in various separation processes.
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Journal: Journal of Membrane Science - Volume 454, 15 March 2014, Pages 339–345