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Adsorptive fouling of modified and unmodified commercial polymeric ultrafiltration membranes

Lindau, J and Jönsson, Ann-Sofi LU (1999) In Journal of Membrane Science 160(1). p.65-76
Abstract
The fouling tendency, due to adsorption on the pore walls, of two pairs of modified and unmodified ultrafiltration membranes, with similar observed retentions determined by dextran and gel permeation chromatography, was studied. The membranes investigated were made of modified and unmodified polyaramide (PA) and modified and unmodified polyvinylidene fluoride (PVDF). The PVDF membrane was surface-modified and the PA membrane was made from a modified polymer solution. Membrane modification was used to reduce fouling by adsorption. Octanoic acid was used as the fouling substance, representing a large number of small, hydrophobic compounds. It is demonstrated in this investigation that membrane modification is not always successful. It was... (More)
The fouling tendency, due to adsorption on the pore walls, of two pairs of modified and unmodified ultrafiltration membranes, with similar observed retentions determined by dextran and gel permeation chromatography, was studied. The membranes investigated were made of modified and unmodified polyaramide (PA) and modified and unmodified polyvinylidene fluoride (PVDF). The PVDF membrane was surface-modified and the PA membrane was made from a modified polymer solution. Membrane modification was used to reduce fouling by adsorption. Octanoic acid was used as the fouling substance, representing a large number of small, hydrophobic compounds. It is demonstrated in this investigation that membrane modification is not always successful. It was determined that at lower concentrations of octanoic acid, the modified PA membrane exhibits a smaller fouling tendency than the unmodified PA membrane, while the result is reversed for concentrations above 60% of the saturation concentration. The fouling tendency of the unmodified PVDF membrane is much lower than that of the modified PVDF membrane at all concentrations. The cross-sections of the membranes were visually examined with scanning electron microscopy, but no difference could be observed between the modified and unmodified membranes. The membranes were also examined with Fourier transform infrared spectroscopy. The spectra of the two PA membranes were different, while no difference was observed for the unmodified and surface-modified PVDF membranes. Remains of octanoic acid were found in the membranes, although they had been thoroughly rinsed with deionized water and the initial pure water flux was recovered. (C) 1999 Elsevier Science B.V. All rights reserved. (Less)
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organization
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Contribution to journal
publication status
published
subject
keywords
fouling, polyaramide, polyvinylidene fluoride, modified membranes
in
Journal of Membrane Science
volume
160
issue
1
pages
65 - 76
publisher
Elsevier
external identifiers
  • wos:000080956900007
  • scopus:0345034565
ISSN
0376-7388
DOI
10.1016/S0376-7388(99)00076-9
language
English
LU publication?
yes
id
6099bbaf-f36e-4375-89a3-2872397a3657 (old id 3915694)
date added to LUP
2013-07-02 11:08:25
date last changed
2017-01-08 04:51:56
@article{6099bbaf-f36e-4375-89a3-2872397a3657,
  abstract     = {The fouling tendency, due to adsorption on the pore walls, of two pairs of modified and unmodified ultrafiltration membranes, with similar observed retentions determined by dextran and gel permeation chromatography, was studied. The membranes investigated were made of modified and unmodified polyaramide (PA) and modified and unmodified polyvinylidene fluoride (PVDF). The PVDF membrane was surface-modified and the PA membrane was made from a modified polymer solution. Membrane modification was used to reduce fouling by adsorption. Octanoic acid was used as the fouling substance, representing a large number of small, hydrophobic compounds. It is demonstrated in this investigation that membrane modification is not always successful. It was determined that at lower concentrations of octanoic acid, the modified PA membrane exhibits a smaller fouling tendency than the unmodified PA membrane, while the result is reversed for concentrations above 60% of the saturation concentration. The fouling tendency of the unmodified PVDF membrane is much lower than that of the modified PVDF membrane at all concentrations. The cross-sections of the membranes were visually examined with scanning electron microscopy, but no difference could be observed between the modified and unmodified membranes. The membranes were also examined with Fourier transform infrared spectroscopy. The spectra of the two PA membranes were different, while no difference was observed for the unmodified and surface-modified PVDF membranes. Remains of octanoic acid were found in the membranes, although they had been thoroughly rinsed with deionized water and the initial pure water flux was recovered. (C) 1999 Elsevier Science B.V. All rights reserved.},
  author       = {Lindau, J and Jönsson, Ann-Sofi},
  issn         = {0376-7388},
  keyword      = {fouling,polyaramide,polyvinylidene fluoride,modified membranes},
  language     = {eng},
  number       = {1},
  pages        = {65--76},
  publisher    = {Elsevier},
  series       = {Journal of Membrane Science},
  title        = {Adsorptive fouling of modified and unmodified commercial polymeric ultrafiltration membranes},
  url          = {http://dx.doi.org/10.1016/S0376-7388(99)00076-9},
  volume       = {160},
  year         = {1999},
}