Surface Grafting of a Zwitterionic Copolymer onto a Cellulose Nanofiber Membrane for Oil/Water Separation
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In study, we report a cellulose-based nanofiber membrane with excellent hydrophilicity and oleophobic property that can prevent contamination by organic residues, which was a serious problem in existing oil/water separation membranes. A cellulose-based nanofibrous membrane was fabricated via electrospinning and deacetylation of cellulose acetate. Exploiting many hydroxyl groups of cellulose, it was incorporated via ring-opening reaction with a zwitterionic copolymer, which was confirmed through XPS and FT-IR. The fabricated copolymer-grafted cellulose nanofibrous membranes allowed highly selective permeation of aqueous phases from three different oil/water mixtures. The average filtration efficiency was greater than 98%, indicating excellent recyclability for at least 20 cycles after the membrane was washed with water to remove contaminants. The proposed material platform can extend to a wide range of applications including, wastewater treatment, and oil purification.