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Vakilinejad A, Dubois E, Michot L, Jardat M, Lairez D, Durand-Vidal S, Guibert C, Jouault N. Electrical surface properties of nanoporous alumina membranes: influence of nanochannels' curvature, roughness and composition studied via electrokinetic experiments. Phys Chem Chem Phys 2023; 25:28150-28161. [PMID: 37818652 DOI: 10.1039/d3cp04067d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/12/2023]
Abstract
Among classical nanoporous oxide membranes, anodic aluminum oxide (AAO) membranes, made of non-connected, parallel and ordered nanochannels, are very interesting nanoporous model systems widely used for multiple applications. Since most of these applications involve local phenomena at the nanochannel surface, the fine description of the electrical surface behavior in aqueous solution is thus of primordial interest. Here, we use an original experimental approach combining several electrokinetic techniques (tangential and transverse streaming potential as well as electrophoretic mobility experiments) to measure the ζ-potential and determine the surface isoelectric points (IEPs) of several AAOs having different characteristic sizes and compositions. Using such an approach, all the different surfaces available in AAOs can be probed: outer surfaces (top and bottom planes), pore wall surfaces (i.e., inner surfaces) and surfaces created by the grinding of the AAOs. We find clear IEP differences between the outer, pore wall and ground surfaces and discuss these in terms of nanochannel and surface morphology (curvature and roughness) and of modifications of the chemical environment of the surface hydroxyl groups. These results highlight the heterogeneities between the different surfaces of these AAO membranes and emphasize the necessity to combine complementary electrokinetic techniques to properly understand the material, an approach which can be extended to many nanoporous systems.
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Affiliation(s)
- Ali Vakilinejad
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Emmanuelle Dubois
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Laurent Michot
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Marie Jardat
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Didier Lairez
- Laboratoire des Solides Irradiés (LSI), École polytechnique, CNRS, CEA, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France
| | - Serge Durand-Vidal
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Clément Guibert
- Sorbonne Université & CNRS, UMR 7197, Laboratoire de Réactivité de Surface (LRS), 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - Nicolas Jouault
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
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2
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Ion and Water Transport in Ion-Exchange Membranes for Power Generation Systems: Guidelines for Modeling. Int J Mol Sci 2022; 24:ijms24010034. [PMID: 36613476 PMCID: PMC9820504 DOI: 10.3390/ijms24010034] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/12/2022] [Accepted: 12/17/2022] [Indexed: 12/24/2022] Open
Abstract
Artificial ion-exchange and other charged membranes, such as biomembranes, are self-organizing nanomaterials built from macromolecules. The interactions of fragments of macromolecules results in phase separation and the formation of ion-conducting channels. The properties conditioned by the structure of charged membranes determine their application in separation processes (water treatment, electrolyte concentration, food industry and others), energy (reverse electrodialysis, fuel cells and others), and chlore-alkali production and others. The purpose of this review is to provide guidelines for modeling the transport of ions and water in charged membranes, as well as to describe the latest advances in this field with a focus on power generation systems. We briefly describe the main structural elements of charged membranes which determine their ion and water transport characteristics. The main governing equations and the most commonly used theories and assumptions are presented and analyzed. The known models are classified and then described based on the information about the equations and the assumptions they are based on. Most attention is paid to the models which have the greatest impact and are most frequently used in the literature. Among them, we focus on recent models developed for proton-exchange membranes used in fuel cells and for membranes applied in reverse electrodialysis.
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3
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Apel P, Koter S, Yaroshchuk A. Time-resolved pressure-induced electric potential in nanoporous membranes: Measurement and mechanistic interpretation. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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4
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Effects of an Electrical Double Layer and Tribo-Induced Electric Field on the Penetration and Lubrication of Water-Based Lubricants. LUBRICANTS 2022. [DOI: 10.3390/lubricants10060111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Understanding the effects of electrical double layers (EDL) and tribo-induced electric fields on the electroosmotic behaviors of lubricants is important for developing high-performance water-based lubricants. In this study, EDL conductivities of aqueous lubricants containing a surfactant of 3-[(3-cholamidopropyl)-dimethylammonio]-1-propanesulfonate (CHAPS) or cetyltrimethylammonium bromide (CTAB) were analyzed. The interfacial zeta potentials of the synthesized lubricants and Al2O3 ceramic-alloy steel contacts were measured, and frictional potentials of ceramic and steel surfaces were determined using a modified ball-on-disc configuration. The distribution characteristics of the tribo-induced electric field of the ceramic-steel sliding contact were numerically analyzed. The electroosmotic behaviors of the lubricants were investigated using a four-ball configuration. It was found that an EDL and tribo-induced electric field was a crucial enabler in stimulating the electroosmosis of lubricants. Through altering EDL structures, CHAPS enhanced the electroosmosis and penetration of the water-based lubricant, thus resulting in improved lubrication.
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Apel P, Bondarenko M, Yamauchi Y, Yaroshchuk A. Osmotic Pressure and Diffusion of Ions in Charged Nanopores. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:14089-14095. [PMID: 34821504 PMCID: PMC8656166 DOI: 10.1021/acs.langmuir.1c02267] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 11/16/2021] [Indexed: 06/13/2023]
Abstract
The transport of ions and water in nanopores is of interest for a number of natural and technological processes. Due to their practically identical long straight cylindrical pores, nanoporous track-etched membranes are suitable materials for investigation of its mechanisms. This communication reports on simultaneous measurements of osmotic pressure and salt diffusion with a 24 nm pore track-etched membrane. Due to the use of dilute electrolyte solutions (1-4 mM KCl and LiCl), this pore size was commensurate with the Debye screening length. Advanced interpretation of experimental results using a full version of the space-charge model has revealed that osmotic pressure and salt diffusion can be quantitatively correlated with electrostatic interactions of ions with charged nanopore walls. The surface-charge density is shown to increase with electrolyte concentration in agreement with the mechanism of deprotonation of weakly acidic surface groups. Moreover, a lack of significant surface-charge dependence on the kind of cation (K+ or Li+) demonstrates that binding of salt counterions does not play a major role in this system.
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Affiliation(s)
- P. Apel
- Joint
Institute for Nuclear Research, Joliot-Curie strasse 6, 141980 Dubna, Russian Federation
| | - M. Bondarenko
- F.
D. Ovcharenko Institute of Bio-Colloid Chemistry, National Academy of Sciences of Ukraine, Vernadskiy blvd. 42, 03142 Kyiv, Ukraine
| | - Yu. Yamauchi
- Joint
Institute for Nuclear Research, Joliot-Curie strasse 6, 141980 Dubna, Russian Federation
| | - A. Yaroshchuk
- ICREA, pg. L. Companys
23, 08010 Barcelona, Spain
- Department
of Chemical Engineering, Universitat Politècnica
de Catalunya, av. Diagonal 647, 08028 Barcelona, Spain
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6
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Krom AI, Ryzhkov II. Ionic Conductivity of Nanopores with Electrically Conductive Surface: Comparison Between 1D and 2D Models. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Artur I. Krom
- Department of Computational Physics Institute of Computational Modelling SB RAS Akademgorodok Krasnoyarsk 660036 Russia
| | - Ilya I. Ryzhkov
- Department of Computational Physics Institute of Computational Modelling SB RAS Akademgorodok Krasnoyarsk 660036 Russia
- Department of Applied Mathematics and Computer Security Siberian Federal University Svobodny 79 Krasnoyarsk 660041 Russia
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7
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Christoulaki A, Lairez D, Dubois E, Jouault N. Probing Polyelectrolyte Adsorption in Charged Nanochannels by Streaming Potential Measurements. ACS Macro Lett 2020; 9:794-798. [PMID: 35648528 DOI: 10.1021/acsmacrolett.0c00172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
It remains a great experimental challenge to obtain quantitative information on the polyelectrolyte (PE) behavior confined in charged nanoporous materials. Here, we propose an original approach using transverse streaming potential measurements (TSPMs), an efficient technique providing information on the electrical surface properties of nanoporous materials through the ζ-potential determination. We conduct TSPMs within the thin double-layer approximation on a model system composed of individual nanochannels, a nanoporous anodic aluminum oxide (AAO) membrane, filled with a well-known PE, sodium polystyrenesulfonate (NaPSS). We demonstrate that TSPMs can provide the AAO ζ-potential under different experimental conditions and monitor the PE penetration in AAO with positive or negative surface charge. On the positive surface, the PE irreversibly adsorbs, while it does not when the surface is negatively charged, indicating the electrostatic nature of the PE adsorption. In the context of experimental limitations to investigate PE behavior on concave surfaces, this study shows that the TSPM is suitable to extract quantitative information and can be exploited to gain an understanding of the PE adsorption and desorption in a confined medium.
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Affiliation(s)
| | - Didier Lairez
- Laboratoire des Solides Irradiés (LSI), École Polytechnique, CNRS, CEA, Institut Polytechnique de Paris, 91128 Cedex Palaiseau, France
| | - Emmanuelle Dubois
- Sorbonne Université, CNRS, Laboratoire PHENIX, F-75005 Paris, France
| | - Nicolas Jouault
- Sorbonne Université, CNRS, Laboratoire PHENIX, F-75005 Paris, France
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8
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Modelling of Ion Transport in Electromembrane Systems: Impacts of Membrane Bulk and Surface Heterogeneity. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app9010025] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Artificial charged membranes, similar to the biological membranes, are self-assembled nanostructured materials constructed from macromolecules. The mutual interactions of parts of macromolecules leads to phase separation and appearance of microheterogeneities within the membrane bulk. On the other hand, these interactions also cause spontaneous microheterogeneity on the membrane surface, to which macroheterogeneous structures can be added at the stage of membrane fabrication. Membrane bulk and surface heterogeneity affect essentially the properties and membrane performance in the applications in the field of separation (water desalination, salt concentration, food processing and other), energy production (fuel cells, reverse electrodialysis), chlorine-alkaline electrolysis, medicine and other. We review the models describing ion transport in ion-exchange membranes and electromembrane systems with an emphasis on the role of micro- and macroheterogeneities in and on the membranes. Irreversible thermodynamics approach, “solution-diffusion” and “pore-flow” models, the multiphase models built within the effective-medium approach are examined as the tools for describing ion transport in the membranes. 2D and 3D models involving or not convective transport in electrodialysis cells are presented and analysed. Some examples are given when specially designed surface heterogeneity on the membrane surface results in enhancement of ion transport in intensive current electrodialysis.
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9
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10
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Ryzhkov II, Lebedev DV, Solodovnichenko VS, Minakov AV, Simunin MM. On the origin of membrane potential in membranes with polarizable nanopores. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2017.11.073] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Fukutsuka T, Koyamada K, Maruyama S, Miyazaki K, Abe T. Ion Transport in Organic Electrolyte Solution through the Pore Channels of Anodic Nanoporous Alumina Membranes. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.03.049] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Efligenir A, Fievet P, Déon S, Salut R. Characterization of the isolated active layer of a NF membrane by electrochemical impedance spectroscopy. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2014.12.044] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Tapiero Y, Rivas BL, Sánchez J, Bryjak M, Kabay N. Polypropylene membranes modified with interpenetrating polymer networks for the removal of chromium ions. J Appl Polym Sci 2015. [DOI: 10.1002/app.41953] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yesid Tapiero
- Polymer Department; Faculty of Chemistry; University of Concepción; Chile
| | - Bernabé L. Rivas
- Polymer Department; Faculty of Chemistry; University of Concepción; Chile
| | - Julio Sánchez
- Polymer Department; Faculty of Chemistry; University of Concepción; Chile
| | - Marek Bryjak
- Division of Polymer and Carbon Materials; Wroclaw University of Technology; Wroclaw 50-370 Poland
| | - Nalan Kabay
- Department of Chemical Engineering; Ege University; Izmir 35100 Turkey
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14
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Zhao K, Lu Q, Su W. Estimation of electrical parameters inside nanofiltration membranes in various electrolyte solutions by dielectric spectroscopy analysis. RSC Adv 2014. [DOI: 10.1039/c4ra13598a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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15
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Szymczyk A, Dirir YI, Picot M, Nicolas I, Barrière F. Advanced electrokinetic characterization of composite porous membranes. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2012.11.076] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Nakamura K, Orime T, Matsumoto K. Response of zeta potential to cake formation and pore blocking during the microfiltration of latex particles. J Memb Sci 2012. [DOI: 10.1016/j.memsci.2012.02.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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NAKAMURA K, HIRAYAMA W, NITTAMI T, MATSUMOTO K. Simultaneous Determination of Pore Size and Surface Charge Density of Microfiltration Membranes by Streaming Potential Measurement. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2012. [DOI: 10.1252/jcej.12we035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Kazuho NAKAMURA
- Department of Chemical and Energy Engineering, Graduate School of Engineering, Yokohama National University
- Department of Chemical and Energy Engineering, Graduate School of Engineering, Yokohama National University
| | - Wakako HIRAYAMA
- Department of Chemical and Energy Engineering, Graduate School of Engineering, Yokohama National University
- Department of Chemical and Energy Engineering, Graduate School of Engineering, Yokohama National University
| | - Tadashi NITTAMI
- Department of Chemical and Energy Engineering, Graduate School of Engineering, Yokohama National University
- Department of Chemical and Energy Engineering, Graduate School of Engineering, Yokohama National University
| | - Kanji MATSUMOTO
- Department of Chemical and Energy Engineering, Graduate School of Engineering, Yokohama National University
- Department of Chemical and Energy Engineering, Graduate School of Engineering, Yokohama National University
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18
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Wang X, Fang Y, Tu C, Van der Bruggen B. Modelling of the separation performance and electrokinetic properties of nanofiltration membranes. INT REV PHYS CHEM 2012. [DOI: 10.1080/0144235x.2012.659049] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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19
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Yoon Y, Mount AS, Hansen KM, Hansen DC. Electrochemical characterization of a bioceramic material: The shell of the Eastern oyster Crassostrea virginica. Bioelectrochemistry 2011; 81:91-8. [DOI: 10.1016/j.bioelechem.2011.04.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2010] [Revised: 04/06/2011] [Accepted: 04/06/2011] [Indexed: 10/18/2022]
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20
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Szymczyk A, Zhu H, Balannec B. Ion Rejection Properties of Nanopores with Bipolar Fixed Charge Distributions. J Phys Chem B 2010; 114:10143-50. [DOI: 10.1021/jp1025575] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anthony Szymczyk
- Université Européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France, and Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1 - ENSCR, 263 Avenue du Général Leclerc, Bâtiment 10 A, CS 74205, 35042 Rennes Cedex, France
| | - Haochen Zhu
- Université Européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France, and Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1 - ENSCR, 263 Avenue du Général Leclerc, Bâtiment 10 A, CS 74205, 35042 Rennes Cedex, France
| | - Béatrice Balannec
- Université Européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France, and Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1 - ENSCR, 263 Avenue du Général Leclerc, Bâtiment 10 A, CS 74205, 35042 Rennes Cedex, France
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21
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Benavente J, Silva V, Prádanos P, Palacio L, Hernández A, Jonson G. Comparison of the volume charge density of nanofiltration membranes obtained from retention and conductivity experiments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:11841-11849. [PMID: 20568820 DOI: 10.1021/la100900w] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A version of the Donnan steric-partitioning pore model with dielectrical exclusion (DSPM-DE) has been used to get information on the pore size and charge density of a commercial membrane, NF45 from FilmTec, from its retention of KCl solutions. The conductivity inside the pores has been measured by impedance spectroscopy, and the electric potential drop during retention experiments has also been measured. These experimental data on conductivity and electric potential are analyzed, by using the thermodynamics of irreversible processes and the space charge model, to obtain the pore charge density of the membrane. These two methods give results in fair accordance which probes that the sometimes controversial method of DSPM-DE can give accurate results for the charge as well as for the mean pore size of a nanofiltration membrane. Some clues to improve the way this model can be used are given as well.
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Affiliation(s)
- Juana Benavente
- Dpto. Física Aplicada, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
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22
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Yaroshchuk A, Boiko Y, Makovetskiy A. Ion-rejection, electrokinetic and electrochemical properties of a nanoporous track-etched membrane and their interpretation by means of space charge model. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:9605-14. [PMID: 19585984 DOI: 10.1021/la900737q] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Due to their straight cylindrical pores, nanoporous track-etched membranes are suitable materials for studies of the fundamentals of nanofluidics. In contrast to single nanochannels, the nano/micro interface, in this case, can be quantitatively considered within the scope of macroscopically 1D models. The pressure-induced changes in the concentration of dilute KCl solutions (salt rejection phenomenon) have been studied experimentally with a commercially available nanoporous track-etched membrane of poly (ethylene terephthalate) (pore diameter ca. 21 nm). Besides that, we have also studied the concomitant stationary transmembrane electrical phenomenon (filtration potential) and carried out time-resolved measurements of the electrical response to a rapid pressure switch-off (within 5-10 ms). The latter has enabled us to split the filtration potential into the streaming potential and membrane potential components. In this way, we could also confirm that the observed nonlinearity of filtration potential, as a function of the transmembrane volume flow, was primarily caused by the salt rejection. The results of experimental measurements have been interpreted by means of a space charge model with the surface charge density being a single fitting parameter (the pore size was estimated from the membrane hydraulic permeability). By using the surface charge density fitted to the salt rejection data, the results of electrical measurements could be reproduced theoretically with a typical accuracy of 10% or better. Taking into account the simplifications made in the modeling, this accuracy appears to be good and confirms the quantitative applicability of the basic concept of space charge model to the description of transport properties of dilute electrolyte solutions in nanochannels of ca. 20 nm.
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Affiliation(s)
- Andriy Yaroshchuk
- ICREA and Department of Chemical Engineering, Polytechnic University of Catalonia, Carrer de Jordi Girona, 08034, Barcelona, Spain.
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23
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Effect of porosity on the effective electrical conductivity of different ceramic membranes used as separators in eletrochemical reactors. J Memb Sci 2006. [DOI: 10.1016/j.memsci.2006.02.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Szymczyk A, Sbaï M, Fievet P. Analysis of the pressure-induced potential arising through composite membranes with selective surface layers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:1818-1826. [PMID: 15723477 DOI: 10.1021/la048399i] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
When a pressure gradient is applied through a charged selective membrane, the transmembrane electrical potential difference, called the filtration potential, results from both the applied pressure and induced concentration difference across the membrane. In this work we investigate the electrokinetic properties relative to both active and support layers of a composite ceramic membrane close to the nanofiltration range. First, the volume charge density of the active layer is obtained by fitting a transport model to experimental rejection rates (which are controlled by the active layer only). Next, the value of the volume charge density is used to compute the theoretical filtration potential through the active layer. For sufficiently high permeate volume fluxes, the concentration difference across the active layer becomes constant, which allows assessing the membrane potential of the active layer. Experimental measurements of the overall filtration potential arising through the whole membrane are performed. The contribution of the support layer to this overall filtration potential is put in evidence. That implies that the membrane potential of the active layer cannot be deduced directly from the overall filtration potential measurements. Finally, the contribution of the support layer is singled out by subtracting the theoretical filtration potential of the active layer from the experimental filtration potential measured across the whole membrane (i.e., support + active layers). The amphoteric behavior of both layers is put in evidence, which is confirmed by electrophoretic measurements carried out with the powdered support layer and by recently reported tangential streaming potential measurements.
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Affiliation(s)
- Anthony Szymczyk
- Laboratoire de Chimie des Matériaux et Interfaces, Université de Franche-Comté, 25030 Besançon Cedex, France.
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25
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Fievet P, Szymczyk A. Caractérisation des propriétés électriques des parois de pores d’une membrane. CR CHIM 2002. [DOI: 10.1016/s1631-0748(02)01413-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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26
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Tay JH, Liu J, Sun DD. Effect of solution physico-chemistry on the charge property of nanofiltration membranes. WATER RESEARCH 2002; 36:585-598. [PMID: 11827320 DOI: 10.1016/s0043-1354(01)00278-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Electrokinetic phenomenon is an important factor in pressure-driven membrane water filtration process. Zeta potential is a measurable and reliable parameter to characterize the charge property of membranes. This study investigated the effects of solution physico-chemistry on the zeta potential of nanofiltration membranes. A comprehensive semi-empirical mathematical model based on the Poisson-Boltzmann equation, Membrane Surface Charge model, was established. The correlations between the zeta potential, surface charge density and solution chemistry were well delineated by this new model. The empirical coefficients in the model are dependent on neither solution pH nor the ionic strength. They only reflect the characteristics of the electrokinetic property of the membrane--solution interface. The point of zero charge (PZC) can be calculated by combination of those empirical coefficients. The Membrane Surface Charge model also provides more information on understanding the charge interaction involved in membrane filtration system. The effects of potential determining ions, indifferent ions and specific adsorption of substances onto the membrane could be revealed by analyzing the coefficients of the model.
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Affiliation(s)
- Joo-Hwa Tay
- Environmental Engineering Research Center, School of Civil and Structural Engineering, Nanyang Technological University, Singapore, Singapore.
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27
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Fievet P, Szymczyk A, Labbez C, Aoubiza B, Simon C, Foissy A, Pagetti J. Determining the Zeta Potential of Porous Membranes Using Electrolyte Conductivity inside Pores. J Colloid Interface Sci 2001; 235:383-390. [PMID: 11254318 DOI: 10.1006/jcis.2000.7331] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The zeta potential is an important and reliable indicator of the surface charge of membranes, and knowledge of it is essential for the design and operation of membrane processes. The zeta potential cannot be measured directly, but must be deduced from experiments by means of a model. The possibility of determining the zeta potential of porous membranes from measurements of the electrolyte conductivity inside pores (lambda(pore)) is investigated in the case of a ceramic microfiltration membrane. To this end, experimental measurements of the electrical resistance in pores are performed with the membrane filled with KCl solutions of various pHs and concentrations. lambda(pore) is deduced from these experiments. The farther the pH is from the isoelectric point and/or the lower the salt concentration is, the higher the ratio of the electrolyte conductivity inside pores to the bulk conductivity is, due to a more important contribution of the surface conduction. Zeta potentials are calculated from lambda(pore) values by means of a space charge model and compared to those calculated from streaming potential measurements. It is found that the isoelectric points are very close and that zeta potential values for both methods are in quite good agreement. The differences observed in zeta potentials could be due to the fact that the space charge model does not consider the surface conductivity in the inner part of the double layer. Measurements of the electrolyte conductivity within the membrane pores are proved to be a well-adapted procedure for the determination of the zeta potential in situations where the contribution of the surface conduction is significant, i.e., for small and charged pores. Copyright 2001 Academic Press.
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Affiliation(s)
- P. Fievet
- Laboratoire de Chimie des Matériaux et Interfaces, 16 route de Gray, Besançon cedex, 25030, France
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Labbez C, Fievet P, Szymczyk A, Aoubiza B, Vidonne A, Pagetti J. Theoretical study of the electrokinetic and electrochemical behaviors of two-layer composite membranes. J Memb Sci 2001. [DOI: 10.1016/s0376-7388(00)00611-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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