Effects of silica sol on ion exchange membranes: Electrochemical characterization of anion exchange membranes in electrodialysis of silica sol containing-solutions |
| |
Authors: | Hong-Joo?Lee Jin-Soo?Park Moon-Sung?Kang Email author" target="_blank">Seung-Hyeon?MoonEmail author |
| |
Affiliation: | (1) Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology (K-JIST), 1 Oryong-dong, Buk-gu, 500-712 Gwangju, Korea;(2) Present address: Radiation and Environment Group, Nuclear Power Laboratory, Korea Electric Power Research Institute (KEPRI), 103-16 Moonji-dong,Yuseong-gu, 305-380 Daejeon, Korea |
| |
Abstract: | 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 |
本文献已被 SpringerLink 等数据库收录! |
|