Preparation of composite ultrafiltration membrane made of cellulose micro/nano crystal
The polysulphone ultrafiltration membrane has some disadvantages, such as low water flux, bad hydrophile property and anti-fouling ability. In order to conquer these disadvantages, with the cellulose pulp as raw materials, the cellulose micro/nano crystal was prepared by the acid-catalyzed hydrolysis method assisted by the ultrasonic treatment. Its properties were evaluated. Mixing the cellulose micro/nano crystal into the polysulphone membrane, the authors obtained the composite ultrafiltration membrane by the phase inversion via immersion precipitation. The ultrafiltration membrane properties were tested. The results show that the pure water flux of ultrafiltration membrane increased with the content of cellulose micro/nano crystal increasing. When the mass ratio of the cellulose to polysulphone reached 30 % , the composite membrane' s pure water flux was 234.2 L/m2 per hour and the preserving ratio of the Bovine Serum Albumin (BSA) solution (1 g/L) was 93.4% . The cellulose micro/nano crystal can increase the pure water flux of the membrane and obviously improve its properties. The composite membrane is also characterized by fast infrared controller and atomic force microscope.
cellulose micro/nano crystalultrafiltration membranepure water fluxpolysulphone
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