Abstract
A novel composite nanofi ltration (NF) membrane was prepared by over-coating the polysulfone ultrafiltration membrane with an alginate thin layer. The effects of the membrane preparation techniques and operating conditions on the rejection performance of the composite membranes were studied. The structure of the composite NF membrane was characterized by scanning electron microscopy and infrared spectroscopy. The results suggested that composite membrane with excellent performances was prepared while the concentration of sodium alginate was 2%, the concentration of glutaraldehyde was 0.9%, and the cross-linking time was 4 h at 30°C. Characterization suggested: The salt rejections to Na2SO4, MgSO4, NaCl and MgCl2(1000 mg·L−1) were 87.2%, 21.5%, 32.0%, 12.2%, respectively. And the permeation fluxes were 30.6 L·h−1·m−2, 35.2 L·h−1·m−2, 33.5 L·h−1·m−2, 22.4 L·h−1·m−2, respectively. In addition, the curve about the streaming potential illustrated the negatively charged characteristics of this membrane, with a ...
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