Determining the zeta-potential of ceramic microfiltration membranes using the electroviscous effect |
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| Affiliation: | 1. Food Engineering, Lund University, PO Box 124221 00 LundSweden;2. Department of Chemical Technology, Lappeenranta University of Technology, PO Box 2053851 LappeenrantaFinland;1. Department of Electrical and Mining Engineering, University of South Africa, Florida Campus, Private Bag X6, Johannesburg 1710, South Africa;2. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag X3, Wits 2050, Johannesburg, South Africa;1. Department of Physics, Osmania University, Hyderabad 500 007, India;2. Consortium for Scientific Research, Khandwa road, Indore 452 017, India;1. Laboratoire de Thermodynamique des Modelistion moleculaire, Faculté de chimie, USTHB, BP, 32 El-Alia, 16111 Bab Ezzouar, Algeria;2. Laboratoire des Sciences Analytiques, UMR 5280, Université Claude Bernard (Lyon I), 43 Boulvard du 11 novembre 1918, 69622 Villeurbanne Cedex, France;1. National Centre for Desalination and Water Treatment Technology, King Abdulaziz City for Science and Technology (KACST), Saudi Arabia;2. Department of Chemical Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, United Kingdom;3. Centre for Water Advanced Technologies and Environmental Research (CWATER), College of Engineering, Swansea University, United Kingdom;4. NYUAD Water Research Centre, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates |
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| Abstract: | ![]()
The possibility of measuring the zeta-potentials of porous membranes using the electroviscous effect was investigated. The zeta-potential of Membralox® ceramic microfiltration membranes was determined both with the newly developed electroviscous technique and by streaming potential measurements. It was found that the electroviscous technique provided a simple means of obtaining accurate values of zeta-potential, especially for higher zeta-potentials. The streaming potential measurements were found to be more suitable for the determination of the iso-electric point, i.e. the pH at which the zeta-potential is zero.The iso-electric points of new α-alumina, zirconia, and titania membranes were found to be 8.5, 8.0, and 6.3, respectively. Upon using the membranes and cleaning them with a detergent, the iso-electric point of the α-alumina membrane decreased to 6.5, and that of the zirconia membrane decreased to 5.2, while the iso-electric point of the titania membrane stayed virtually constant. Cleaning these membranes with a strong acid or base could not reverse the observed decreases in iso-electric point. |
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