Preparation and characterization of PVA/SA composite nanofiltration membranes

✍ Scribed by Jonggeon Jegal; Nam-Wun Oh; Kew-Ho Lee

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 186 KB
• Volume: 77
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(20000711)77:2<347::aid-app10>3.0.co;2-1

✦ Synopsis

Nanofiltration (NF) composite membranes based on poly(vinyl alcohol) (PVA) and sodium alginate (SA) were prepared by coating PVA/SA (95/5 in wt %) mixture solutions on microporous polysulfone (PSF) supports. For the formation of a defect free thin active layer on a support, the PSF support was multi-coated with a dilute PVA/SA blend solution. The PVA/SA active layer formed was crosslinked at room temperature by using an acetone solution containing glutaraldehyde as a crosslinking agent. The prepared composite membranes were characterized with a scanning electron microscopy (SEM), a Fourier transform infrared spectroscopy (FTIR), an electrokinetic analyzer (EKA) and permeation tests: The thicknesses of the active layers were about 0.25 m and 0.01 m depending on the preparation conditions. The crosslinking reaction of the active layers were completed in less than three minutes via the formation of acetal linkage. The surface of the PVA/SA composite membrane was found to be anionic. The permeation properties of the composite membrane were as follows: 1.3 m 3 /m 2 day of flux and Ͼ 95% of rejection at 200 psi for 1000 ppm PEG600 solution.