Preparation and characterization of nanofiltration composite membranes using polyacrylonitrile (PAN). I. preparation and modification of PAN supports

摘要: Polyacrylonitrile (PAN) supports useful for the formation of nanofiltration (NF) composite membranes were prepared from PAN solutions in N-methylpyrrolidone (NMP), using a phase-inversion method. The compositions PAN/NMP used as follows: 10/90, 15/85, and 20/80 (in wt %). treated with various concentrations NaOH aqueous (0.1, 0.5, 1, 2 mol) certain periods times (0.5, 2, 3 h) order to modify their surface chemically morphologically. characteristics supports, modified or unmodified, carefully studied. morphology those observed field-emission scanning electron microscopy (FESEM) atomic force (AFM). change chemical structure by treatment was studied FTIR–ATR spectroscopy ESCA. permeation properties also determined at 1–5 bar operation pressure PEG 35,000 feed solution. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1854–1862,