Comparison of liquid–liquid displacement porosimetry and scanning electron microscopy image analysis to characterise ultrafiltration track-etched membranes

Calvo, José Ignacio Madalena; Bottino, A.; Capannelli, G.; Hernández, Antonio

doi:10.1016/j.memsci.2004.02.038

Cited by 90 publications

(46 citation statements)

References 16 publications

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“…The apparatus used in the analysis was completely automated. A detailed description of LLDP theory and experimental procedure can be seen elsewhere [8]. The LLDP method is based on the measurements of pressure and flow through the membrane, consequently leading to the calculation of pore radius opened at the given applied pressure.…”

Section: Liquid-liquid Displacement Porometrymentioning

confidence: 99%

Fabrication and characterization of polyethersulfone nanocomposite membranes for the removal of endocrine disrupting micropollutants from wastewater. Mechanisms and performance

Kamińska

Bohdziewicz

Calvo

et al. 2015

Journal of Membrane Science

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The addition of carbon nanotubes to improves the removal and adsorption of endocrine disrupting micropollutants (bisphenol A and nonylphenol). Increasing the SWCNT (single walled carbon nanotubes) content increases removal and diminishes reversible and irreversible fouling.The isoelectric point of the SWCNT containing membranes decreases when the content of nanotubes increases with more negative charges at alkaline pH. Because, the nanotube loaded membranes are also less hydrophilic and bisphenol and nonylphenol are hydrophobous, adsorption plays a key role in the removal of micropollutants. An increase in the transmembrane applied pressure decreases the removal and more steeply for the membranes containing more SWCNT.Higher porosities, leading to higher water permeabilities, are also obtained for more loaded membranes. Too high SWCNT contents lead to a saturation and decrease of removal probably because high porosities lead to a decrease in adsorption due to both a decrease in the available surface and a sweeping action of convection through the membrane.

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Section: Liquid-liquid Displacement Porometrymentioning

confidence: 99%

Fabrication and characterization of polyethersulfone nanocomposite membranes for the removal of endocrine disrupting micropollutants from wastewater. Mechanisms and performance

Kamińska

Bohdziewicz

Calvo

et al. 2015

Journal of Membrane Science

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“…The porosimeters used in the analysis consist in two twin automated devices developed in parallel in SMAP (University of Valladolid) and DCCI (University of Genoa) laboratories, [19,20].…”

Section: Liquid-liquid Displacement Porosimetrymentioning

confidence: 99%

Porosimetric characterization of polysulfone ultrafiltration membranes by image analysis and liquid–liquid displacement technique

et al. 2015

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Structural and surface properties of two commercial polysulfone ultrafiltration membranes have been evaluated by different techniques. Pore size distributions have been determined by Liquid-Liquid Displacement Porosimetry (LLDP) as well as by image analysis performed onto Field Emission Scanning Electron Microscopy (FESEM) images of the membrane surfaces. Fourier Transform Infrared Spectroscopy (FTIR) has been used to investigate membrane composition, and in particular, to obtain proper information on the presence of additive within the membrane structure.Porosimetric results obtained by the two independent techniques compared reasonably well and the Molecular Weight Cut Off (MWCO) of the two membranes estimated from LLDP pore size distribution were found to be in good agreement with the nominal values given by manufacturers.

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“…The pore permeability distribution is directly determined by the experimental flux versus pressure data using the Cantor equation (assuming cos contact angle equal to1) as described elsewhere [22,23]. An isobutanol-methanol-water mixture was used as a wetting-displacing fluid pair, using isobutanol-methanol for wetting and water for displacement.…”

Section: Membrane Characterizationmentioning

confidence: 99%

Ultrafiltration of biologically treated domestic wastewater: How membrane properties influence performance

Filloux

Teychene

Tazi‐Pain

et al. 2014

Separation and Purification Technology

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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. Ultrafiltration of biologically treated domestic wastewater AbstractIn this study, the impact of membrane properties on membrane fouling and permeate water quality was investigated. Short-and long-term laboratory scale experiments using four commercially available hollow fiber UF membranes were performed to study the impact of membrane properties on reversible and irreversible fouling. No significant differences in terms of permeate quality (i.e. biopolymer rejection) were observed over the four tested membranes. It was found that membrane characteristics including pore size, pore distribution and especially materials had a strong impact on the filtration performances in terms of both reversible and irreversible fouling. The short-term filtration tests showed that due to its specific hydrodynamic condition only the inside-out mode UF membrane was subjected to irreversible fouling. These data demonstrate the importance of membrane selection with appropriate operating conditions for optimum performances. The added value of membrane characterization to lab-scale filtration tests for membrane performance was discussed.

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Comparison of liquid–liquid displacement porosimetry and scanning electron microscopy image analysis to characterise ultrafiltration track-etched membranes

Cited by 90 publications

References 16 publications

Fabrication and characterization of polyethersulfone nanocomposite membranes for the removal of endocrine disrupting micropollutants from wastewater. Mechanisms and performance

Fabrication and characterization of polyethersulfone nanocomposite membranes for the removal of endocrine disrupting micropollutants from wastewater. Mechanisms and performance

Porosimetric characterization of polysulfone ultrafiltration membranes by image analysis and liquid–liquid displacement technique

Ultrafiltration of biologically treated domestic wastewater: How membrane properties influence performance

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