A contribution to the translation of retention curves into pore size distributions for sieving membranes

Aimar, Pierre; Meireles, Martine; Sánchez, V.

doi:10.1016/s0376-7388(00)80618-3

Cited by 192 publications

(76 citation statements)

References 20 publications

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“…The pore size of the outer-wall VA CNT membrane was estimated by fitting to the hindered pore-flow solute transport model. This method is commonly used to determine the molecular weight cutoff of membranes for water treatment [37][38][39] . The Stokes radii for various dextran molecules were obtained from their molecular weights using the empirical equation [18][19][20] a ¼ 0.488 Â M 0.437 , which was derived from the Stokes-Einstein relationship.…”

Section: Methodsmentioning

confidence: 99%

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A carbon nanotube wall membrane for water treatment

et al. 2015

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Various forms of carbon nanotubes have been utilized in water treatment applications. The unique characteristics of carbon nanotubes, however, have not been fully exploited for such applications. Here we exploit the characteristics and corresponding attributes of carbon nanotubes to develop a millimetre-thick ultrafiltration membrane that can provide a water permeability that approaches 30,000 l m À 2 h À 1 bar À 1 , compared with the best water permeability of 2,400 l m À 2 h À 1 bar À 1 reported for carbon nanotube membranes. The developed membrane consists only of vertically aligned carbon nanotube walls that provide 6-nm-wide inner pores and 7-nm-wide outer pores that form between the walls of the carbon nanotubes when the carbon nanotube forest is densified. The experimental results reveal that the permeance increases as the pore size decreases. The carbon nanotube walls of the membrane are observed to impede bacterial adhesion and resist biofilm formation.

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Section: Methodsmentioning

confidence: 99%

“…Notably, 490% rejection was used for estimation of the pore size because the typical method for measuring the molecular weight cutoff is based on the 90% rejection of dextran solute [37][38][39] :…”

Section: Methodsmentioning

confidence: 99%

A carbon nanotube wall membrane for water treatment

et al. 2015

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“…The hydraulic radius of organic matter was estimated using an empirical equation which holds for MW < 100 kDa [34]:…”

Section: Organic Matter Characterization By Lc-ocdmentioning

confidence: 99%

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Shang

Vuong

et al. 2015

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. irreversible fouling, is still a critical aspect affecting the operational cost and energy consumption in water treatment plants. In this study, four ceramic membranes with pore sizes or molecular weight cut-off (MWCO) of 0.20 μm, 0.14 μm, 300 kDa and 50 kDa were compared during natural surface water filtration with respect to hydraulically irreversible fouling index (HIFI), foulant composition and narrowing of pore size due to the irreversible fouling. Our results showed that the hydraulically irreversible fouling index (HIFI) was proportional to the membrane pore size (r 2 =0.89) when the same feed water was filtrated. The UF membranes showed lower HIFI values than the MF membranes. Pore narrowing (internal fouling) was found to be a main fouling pattern of the hydraulically irreversible fouling. The internal fouling was caused by monolayer adsorption of foulants with different sizes that is dependent on the size of the membrane pore.

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“…In order to achieve high values of permeability and selectivity, the active layer should be ultrathin and hydrophilic [5][6][7][8][9]. Reverse osmosis membranes are prepared by different techniques, amongst micro porous polymeric membrane, which finds many applications in the fields of dehydration of organic mixtures, water treatment and organic-organic separation [10,11].…”

Section: Introductionmentioning

confidence: 99%

Polyvinyl Alcohol-Cellulose Acetate Composite Reverses Osmosis Membranes: I. Synthesis and Characterization

Muhammed¹,

Hashash²

2012

Hydrol Current Res

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To overcome the high salinity water resources problem, reverse osmosis (RO) process is considered one of the most required techniques due to its high portable water quality produced. Optimization of membranes quality and function is still pursued and considered as of an important added value to the RO processes. In the present study, thin film PVA/CA+PEG membranes were prepared and the PVA layer was crosslinked by a varying maleic acid concentration at different reaction periods. The polymer composite is to be employed for the reverse osmosis process of brackish, saline and sea water purification. Optimization of reaction conditions and parameters such as salt rejection and water flux that affect on the membrane efficiency were verified. Structural and functional characterization of the PVA/CA composite membranes through Fourier Transform Infrared (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction pattern, scanning electron microscopy (SEM), swelling behavior and membrane mechanical properties were monitored.

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A contribution to the translation of retention curves into pore size distributions for sieving membranes

Cited by 192 publications

References 20 publications

A carbon nanotube wall membrane for water treatment

A carbon nanotube wall membrane for water treatment

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Polyvinyl Alcohol-Cellulose Acetate Composite Reverses Osmosis Membranes: I. Synthesis and Characterization

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