화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.20, No.5, 889-895, September, 2003
DOI10.1007/BF02697294  Export Citation
Effects of Silica Sol on Ion Exchange Membranes: Electrochemical Characterization of Anion Exchange Membranes in Electrodialysis of Silica Sol Containing-Solutions
Hong-Joo Lee, Jin-Soo Park, Moon-Sung Kang, and Seung-Hyeon Moon†
  • Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology (K-JIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
E-mail:
The fouling potential of the negatively charged silica sol in electrodialysis (ED) by adsorption on the surface of an anion exchange membrane was investigated. Since the fouling potential is related to the physical and electrochemical properties of the silica sol and anion exchange membranes, it is important to characterize the properties of silica sol and membranes. The surface charge of silica sol was investigated by the electrophoretic mobility and its isoelectric point was determined as pH 3. The commercial anion exchange membranes were characterized in terms of exchange capacity, water content, the zeta potential and the electrochemical properties of the membranes using impedance spectroscopy to predict the effects on the electrodialysis performances. Among the characterized properties, exchange capacity and some electrochemical properties of the anion exchange membranes were rather improved after ED experiments. In the electrodialysis of solution containing silica sol, deposition of the silica sol did not decrease the desalting performance of the anion exchange membranes because of loosely packed cake layer on the membrane surface.
Keywords:Characterization;Silica Sol;Electrodialysis;Impedance Spectroscopy;Fouling
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