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Electrokinetic characterization of the Al2O3 ceramic MF membrane by streaming potential measurements |
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| Authors: | Jianer Zhou Xiaozhen Zhang Yongqing Wang Xuebing Hu A Larbot M Persin |
| Affiliation: | 1. University Key Laboratory for Inorganic Membranes in Jiangxi Province, Jingdezhen Ceramic Institute 333001, Jiangxi Province, PR China;2. Institut Européen des Membranes, UMR 5635 CNRS ENSCM UMII, 1919 Route de Mende, 34293 Montpellier Cedex 5, France;1. Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark;2. Inorganic Membranes, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands;1. Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan;2. Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan;1. Dept. of Building, Civil and Environmental Eng., Concordia University, Montreal, Canada H3G 1M8;2. Dept. of Civil Engineering, University of Manitoba, Winnipeg, Canada R3V 1T9;1. State Key Laboratory of Hollow Fiber Membrane Materials and Processes, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China;2. School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China |
| Abstract: | The alumina microfiltration(MF) membrane was modified with nanocrystalline TiO2 in the pore wall. The electrokinetic properties of unmodified and modified alumina membranes were characterized by streaming potential measurements during tangential filtration at various conditions of pH, ionic concentration and ionic species in solutions. The modified membrane reveals a more acidic characteristic. The influence of pH value on the streaming potential of both membranes is explained by the shifting of the proton equilibrium that occurs at the surface of the membrane. The modification of the alumina membrane with TiO2 leads to the decrease of its isoelectric point (IEP) from 6.1 to 4.0 when filtered with NaCl solution. The ionic concentration and electrolyte species also have influence on the streaming potential of both membranes. The reversal of the streaming potential sign and the change of the isoelectric point of the membrane when filtered with CaCl2 and Na2SO4 solutions show specific adsorption of Ca2+ and SO42- ions onto the surface. |
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