Liquid–liquid displacement porometry to estimate the molecular weight cut-off of ultrafiltration membranes

Calvo, José Ignacio Madalena; Peinador, René Israel; Prádanos, Pedro; Palacio, Laura; Bottino, A.; Capannelli, G.; Hernández, Antonio

doi:10.1016/j.desal.2010.10.016

Cited by 48 publications

(27 citation statements)

References 30 publications

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“…In such a representation the biggest pore corresponds to the first one opened while the smallest one should be opened when the 100% of the flux has been reached. A graphical determination of the pore size such that 90 % of the pores are smaller, and only 10 % of the total pores are bigger, should define what we will use to estimate the molecular weight cut-off for the membrane, [26]. In this estimation, a semiempirical correlation between molecular weight, diffusion coefficient and molecule Stoke´s radius, valid for dextran molecules, [32], will be used.…”

Section: Cut-off Estimationmentioning

confidence: 99%

“…On the contrary Liquid-Liquid Displacement Porosimetry (LLDP), because it uses a pair of immiscible liquids with very low interfacial tension is very suitable for characterizing UF membranes at relatively low applied pressures. Tung In this work, porosity and pore size distribution of two different kinds of commercial polymeric UF membranes evaluated by LLDP will be used to estimate their MWCO according to a procedure previously developed, [26].…”

Section: Introductionmentioning

confidence: 99%

“…A detailed description of the equipment and the experimental procedure can be seen elsewhere, [20], while a scheme of the experimental setup has been published in several previous papers, see for example, [26]. The main feature of the equipment is the use of a precise syringe pump ISCO-250D, allowing accurate and very stable fluxes without fluctuations that make unnecessary any sort of dampening.…”

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confidence: 99%

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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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Section: Cut-off Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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

et al. 2015

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“…Moreover, using the calculation procedure described by Calvo et al [9], the molecular weight cut off was estimated. This method is based on finding the pore size that constitutes 90% of the total population of pores in the membrane.…”

Section: Lldpmentioning

confidence: 99%

“…By raising the pressure stepwise, corresponding pore radius and flow values are revealed and the total permeability of the membrane can be acquired. Moreover, molecular weight cut off was estimated from LLDP data using a procedure previously published [9].…”

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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Porosity

Calvo¹,

Bottino²,

Prádanos³

et al. 2013

Encyclopedia of Membrane Science and Technology

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This article details the most important techniques used to characterize membrane porosity and pore size distribution. A variety of methods that provide direct and indirect information about the pores' structure, distribution, and morphology are overviewed, including microscopy‐based techniques, solute retention test and modeling, dusty gas model, picnometry, permporometry, thermoporometry, gas adsorption‐desorption, and displacement porosimetry.

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Liquid–liquid displacement porometry to estimate the molecular weight cut-off of ultrafiltration membranes

Cited by 48 publications

References 30 publications

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

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

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

Porosity

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