Probing polyamide membrane surface charge, zeta potential, wettability, and hydrophilicity with contact angle measurements

Hurwitz, Gil; Guillen, Gregory R.; Hoek, Eric M.V.

doi:10.1016/j.memsci.2009.11.063

Cited by 388 publications

(198 citation statements)

References 52 publications

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“…Charge density of the membrane was evaluated through the zeta potential value which indicates a net interaction between the membrane surface and an electrolyte (Hurwitz et al, 2010). In this study, the solution pH appeared to have a significant impact on the zeta potential of the ESPA2 membrane (Fig.…”

Section: Charge Densitymentioning

confidence: 84%

“…Tian et al (2010) hypothesised that sodium hydroxide could increase the membrane surface hydrophobicity by reacting with hydrophilic functional groups in the active layer. Previous studies (Hurwitz et al, 2010;Tang et al, 2009) showed that changes in the contact angle may indicate changes in the membrane conformation and also the charge density. However, in this study, no observable changes in the conformation of the membranes cleaned by either citric acid or sodium hydroxide can be seen from the zeta potential (Fig.…”

Section: Hydrophobocity and Surface Bondingmentioning

confidence: 98%

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Chemical cleaning effects on properties and separation efficiency of an RO membrane

Tu¹,

Chivas²,

Nghiem³

2015

Membr. Water Treat.

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This study aims to investigate the impacts of chemical cleaning on the performance of a reverse osmosis membrane. Chemicals used for simulating membrane cleaning include a surfactant (sodium dodecyl sulfate, SDS), a chelating agent (ethylenediaminetetraacetic acid, EDTA), and two proprietary cleaning formulations namely MC3 and MC11. The impact of sequential exposure to multiple membrane cleaning solutions was also examined. Water permeability and the rejection of boron and sodium were investigated under various water fluxes, temperatures and feedwater pH. Changes in the membrane performance were systematically explained based on the changes in the charge density, hydrophobicity and chemical structure of the membrane surface. The experimental results show that membrane cleaning can significantly alter the hydrophobicity and water permeability of the membrane; however, its impacts on the rejections of boron and sodium are marginal. Although the presence of surfactant or chelating agent may cause decreases in the rejection, solution pH is the key factor responsible for the loss of membrane separation and changes in the surface properties. The impact of solution pH on the water permeability can be reversed by applying a subsequent cleaning with the opposite pH condition. Nevertheless, the impacts of solution pH on boron and sodium rejections are irreversible in most cases. Abstract. This study aims to investigate the impacts of chemical cleaning on the performance of a reverse osmosis membrane. Chemicals used for simulating membrane cleaning include a surfactant (sodium dodecyl sulfate, SDS), a chelating agent (ethylenediaminetetraacetic acid, EDTA), and two proprietary cleaning formulations namely MC3 and MC11. The impact of sequential exposure to multiple membrane cleaning solutions was also examined. Water permeability and the rejection of boron and sodium were investigated under various water fluxes, temperatures and feedwater pH. Changes in the membrane performance were systematically explained based on the changes in the charge density, hydrophobicity and chemical structure of the membrane surface. The experimental results show that membrane cleaning can significantly alter the hydrophobicity and water permeability of the membrane; however, its impacts on the rejections of boron and sodium are marginal. Although the presence of surfactant or chelating agent may cause decreases in the rejection, solution pH is the key factor responsible for the loss of membrane separation and changes in the surface properties. The impact of solution pH on the water permeability can be reversed by applying a subsequent cleaning with the opposite pH condition. Nevertheless, the impacts of solution pH on boron and sodium rejections are irreversible in most cases.

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Section: Charge Densitymentioning

confidence: 84%

Section: Hydrophobocity and Surface Bondingmentioning

confidence: 98%

Chemical cleaning effects on properties and separation efficiency of an RO membrane

Tu¹,

Chivas²,

Nghiem³

2015

Membr. Water Treat.

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“…This negative charge could be the result of the ionization of acidic functional groups. Double layer compression with increasing NaCl concentration was observed in both membranes [25]. In solutions of low CaCl 2 concentration, the charge of PA and PS membranes was significantly reduced by ca.…”

Section: Zeta Potential Of Ps and Pa Membranesmentioning

confidence: 91%

“…Nevertheless, the accurate surface chemistry of both membranes (e.g., spatial distribution and accessibility of functional groups) is not known [31], consequently, adding a level of complexity to these systems. Additionally, PA and PS membranes have been previously demonstrated chemically and physically heterogeneous even at the nano-scale [25,32]. The contact angles of PA and PS membranes were 57.8±1.9 o (n=8) and 67.2±2.9 o (n=8), respectively, indicating the higher hydrophilic character of PA membrane surface.…”

Section: Rbs Ftir Contact Angle and Elemental Analysismentioning

confidence: 92%

Natural organic matter interactions with polyamide and polysulfone membranes: Formation of conditioning film

Gutierrez

Aubry²,

Linares

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Please cite this article as: L. Gutierrez, C. Aubry, R. Valladares, J.-P. Croue, Natural organic matter interactions with polyamide and polysulfone membranes: formation of conditioning film, Colloids and Surfaces A: Physicochemical and Engineering Aspects (2015), http://dx.doi.org/10. 1016/j.colsurfa.2015.03.031 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Here is the measured electrical (streaming) potential in the flow cell, ΔP is the applied pressure in the cell used to force the electrolyte to flow over the charged surfaces, ε 0 is the vacuum permittivity, εr is the relative dielectric constant of the electrolyte solvent, is the zeta potential, ηis the dynamic viscosity of the electrolyte, λ 0 is the bulk conductivity of the circulating electrolyte, λ h is the electrical conductivity of the highly saline reference solution (100mM KCl), R h is the measured electrical resistance across the flow channel filled with the highly saline reference solution, and R is the measured electrical resistance across the flow channel filled with the normal experimental electrolyte [5].…”

Section: Surface Charge Characterizationmentioning

confidence: 99%

Effect of Myoglobin Concentration as Surface Modifying Molecule in Ultrafiltration Polyetehrsulfone Membrane for Lysozyme Separation

Ali¹,

Syaima²,

Mazidah³

2011

MJS

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The application of polyethersulfone (PES) as the base polymer for the fabrication of ultrafiltration (UF) and microfiltration (MF) membrane has been vastly studied for several decades. PES had been the material of choice owing to its superior selectivity, stability, good thermal and mechanical strength. However, despite the advantages, the hydrophobicity of PES still remains to be the prime constraint for the wide utilization of this polymer as the opted fabrication material for protein application since hydrophobic surfaces is known to be very susceptible to fouling. Therefore, in this study, ultrafiltration polyethersulfone (UF-PES) membrane has been modified to render the surface with hydrophilic property. The modification is done by using a simple dip coating technique, utilizing myoglobin as the coating reagent. The pH of the coating solution was fixed to pH 7.0 and the concentration of myoglobin was varied to 30, 50 and 70 mg/L. Membranes were named as MPH7-30, MPH7-50 and MPH7-70 with regard to the concentration of the myoglobin solution. To assess the hydrophilicity characteristics, these surface modified membranes were subjected to contact angle analysis. Membranes were also submitted to Attenuated Total Reflection -Fourier Transformed Infrared Spectroscopy (ATR-FTIR), Electro Kinetic Analyzer (EKA) and molecular weight cut-off (MWCO) evaluations. Membrane coated with myoglobin solution of pH 7.0 with 50 mg/L concentration (MPH7-50), shows a very remarkable characteristics and performances. Owing to this, MPH7-50 membrane was applied in the ultrafiltration of lysozyme. The stability of the membrane was also estimated from the pure water flux analysis Results showed that, MPH7-50 provides a high flux(21.95 L/m 2 .h) as well as transmission (98%), thus its utilization for protein components is indeed to be promising. ABSTRAK Aplikasi polyethersulfone sebagai polimer asas di dalam fabrikasi membran penuras ultra dan mikro telah dikaji selama berdekad. PES menjadi pilihan disebabkan oleh ciri-cirinya iaitu tahap

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Probing polyamide membrane surface charge, zeta potential, wettability, and hydrophilicity with contact angle measurements

Cited by 388 publications

References 52 publications

Chemical cleaning effects on properties and separation efficiency of an RO membrane

Chemical cleaning effects on properties and separation efficiency of an RO membrane

Natural organic matter interactions with polyamide and polysulfone membranes: Formation of conditioning film

Effect of Myoglobin Concentration as Surface Modifying Molecule in Ultrafiltration Polyetehrsulfone Membrane for Lysozyme Separation

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