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Electrical and surface chemical characterizations of the active layer of composite polyamide/polysulphone nanofiltration commercial membranes
Author(s) -
Ariza M. J.,
Cañas A.,
Benavente J.
Publication year - 2000
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/1096-9918(200008)30:1<425::aid-sia772>3.0.co;2-c
Subject(s) - nanofiltration , membrane , polyamide , electrokinetic phenomena , zeta potential , streaming current , chemical engineering , surface charge , x ray photoelectron spectroscopy , dielectric spectroscopy , materials science , thin film composite membrane , chemistry , analytical chemistry (journal) , chromatography , composite material , nanotechnology , reverse osmosis , electrochemistry , electrode , biochemistry , nanoparticle , engineering
Membrane separation techniques are now commonly used in many industrial processes. Because the membrane surface chemistry, morphology and the effective surface charge can influence the membrane separation properties to a large extent, it is important to get information about these parameters. In this work, the active layer (polyamide) of two commercial composite membranes is characterized. Morphological, electrokinetic and surface chemical characterizations of both active layers were carried out by: impedance spectroscopy measurements, using equivalent circuits as models, which allow their electrical and geometrical characterization; tangential streaming potential and membrane potential measurements, to obtain the charge arrangement in both bulk and in the surface; and surface chemical composition, obtained by x‐ray photoelectron spectroscopy. Electrokinetic parameters (electrical resistance, transport numbers and zeta potential) were determined with the membranes in contact with NaCl solutions at different salt concentrations. Differences in transport parameters obtained with both nanofiltration membranes may be related to differences in the membrane morphology and chemical composition of their active layers. Copyright © 2000 John Wiley & Sons, Ltd.