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Understanding Membrane Fouling in Terms of Surface Free Energy Changes

✍ Scribed by Kwang-Ho Choo; Chung-Hak Lee

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
61 KB
Volume
226
Category
Article
ISSN
0021-9797

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✦ Synopsis

The interaction between membrane surfaces and solutes in solution plays an important role in determining the extent of membrane fouling. Fouling has normally been interpreted by the membranesolute hydrophobic interactions but contradictory results have often been reported. In this study the extent of fouling was investigated in terms of the surface free energy change during the adsorption of foulants onto membranes. The free energy change of membrane fouling is derived as

where a and b depend on the surface properties of foulants present in aqueous solution. When three different membrane materials such as cellulosics, polysulfone, and fluoropolymer were tested, the fluoropolymer membrane gave the smallest fouling tendency, even though it is the most hydrophobic. The predicted fouling trend based on the dispersion component of surface tension was in better agreement with the experimental results rather than that based on the surface hydrophobicity.

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