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A Study on Chlorine Resistance Improvement of Reverse Osmosis Membrane by Surface Modification  

Kim, Younggil (College of Environment and Applied Chemistry, Kyung Hee University)
Kim, Nowon (Department of Environmental Engineering, Dongeui University)
Lee, Yong-Taek (College of Environment and Applied Chemistry, Kyung Hee University)
Publication Information
Membrane Journal / v.15, no.4, 2005 , pp. 320-329 More about this Journal
Abstract
Polyamide membrane degradation by chlorine has been studied to improve membrane durability. In this study, it was found that the salt rejection was reduced rapidly and flux of the membrane was increased slowly far membrane treated under chlorine condition. In order to improve resistance to chlorine of the polyamide reverse osmosis membrane, fluorine-containing silane coupling agent (FSCA) was introduced to surface modification. Surface properties and chlorine resistance of silane modified membrane were compared with virgin membrane. It was found that the surface of silane modified membrane has dense structure according to FSCA concentration increasing. The results of surface analysis suggest that FSCA retrieved a severe change in the hydrophobicity and surface roughness. In addition, it appears that FSCA can enhance chlorine resistance due to the interaction of such substance with free radical chlorine.
Keywords
chlorine resistance; polyamide; reverse osmosis membrane; silane coupline agent; surface modification;
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