Membrane pore characterization—comparison between single and multicomponent solute probe techniques

Tam, C.M.; Tremblay, André Y.

doi:10.1016/s0376-7388(00)80683-3

Cited by 108 publications

(71 citation statements)

References 12 publications

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“…The results show that the MWCO (90% PEG rejection) of the membranes shifted from 80 kDa to 100 kDa as ZIF-L loading was increased from 0.25% to 1.0%. The MWCO of 80 kDa and 100 kDa corresponded to pore size of 14.8 nm and 16.5 nm, respectively [28]. The increase in pore size contributed to the higher flux of the modified membrane.…”

Section: Molecular Weight Cut-off (Mwco)mentioning

confidence: 97%

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Effect of addition of two-dimensional ZIF-L nanoflakes on the properties of polyethersulfone ultrafiltration membrane

Low

Razmjou

Wang

et al. 2014

Journal of Membrane Science

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A new two-dimensional zeolitic imidazolate framework with leaf-shaped morphology (ZIF-L) was incorporated into polyethersulfone (PES) ultrafiltration membranes to investigate how the ZIF nanoflakes affect functional membrane properties. The membranes were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), and contact angle goniometry. The water permeability and molecular weight cut-offs (MWCO) of membranes were also determined under constant pressure filtration. Membrane fouling resistance was characterized under constant flux operation using bovine serum albumin (BSA) as foulant. The modified UF membrane with 0.5% ZIF-L loading showed around 75% increase in water flux without greatly affecting the MWCO. Also, the same membrane showed almost twice the fouling resistance improvement against BSA with more than 80% water flux recovery. The improvement was due to the combined effect of the lower zeta potential of the modified membrane, increased hydrophilicity and reduced surface roughness, which made the attachment of BSA protein on the membrane surface more difficult. These results 2 demonstrate that the addition of 2-dimensional ZIF-L nanoflakes is effective for improving polymer membrane fouling resistance and water flux.

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Section: Molecular Weight Cut-off (Mwco)mentioning

confidence: 97%

“…The surface morphology and roughness of the membranes were characterized by AFM , where d is the pore diameter (nm) [28].…”

Section: Characterization Of Zif-l Nanoflakes and Membranesmentioning

confidence: 99%

Effect of addition of two-dimensional ZIF-L nanoflakes on the properties of polyethersulfone ultrafiltration membrane

Low

Razmjou

Wang

et al. 2014

Journal of Membrane Science

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“…We favor this method over using solutions containing a solute mixture to obtain a molecular weight cut-off curve for the membrane. It has been demonstrated that the use of mixtures tends to underestimate the molecular cut-off and the pore size of the membrane due to solute±solute interferences that occur during the passage of the mixed solutes through the membrane pores [21,22]. Polyethylene glycols (PEG, Fluka) were chosen as probe solutes since they are water soluble and can be readily obtained commercially with narrow molar mass distributions.…”

Section: Determination Of Permeability and Cut-offmentioning

confidence: 99%

Static protein adsorption, ultrafiltration behavior and cleanability of hydrophilized polysulfone membranes

Möckel

Staude

Guiver

1999

Journal of Membrane Science

167

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A systematic study on the in¯uence of incrementally increased hydrophilicity of UF membranes made from chemically modi®ed polysulfone on static protein adsorption, protein ultra®ltration performance and cleanability was performed. Hydrophilicity was imparted to the polymeric backbone either by carboxylation or sulfonation. Membranes with 100% retention towards sulfhydryl modi®ed bovine serum albumin (cys-BSA) were made by the phase inversion process from unmodi®ed polysulfone, ®ve carboxylated polysulfones (degrees of carboxylation ranging from 0.26 to 1.74) and two sulfonated polysulfones (degrees of sulfonation of 0.24 and 0.58). 1000 ppm aqueous solutions of cys-BSA at pH values 3, 4.8 and 9 were used in KCl medium at either low or high concentration. Static adsorption, ultra®ltration (UF)¯ux reduction and protein binding strength were lower at pH 3 than at pH 9 but reached an expected maximum at the protein's isoelectric point at pH 4.8. Hydrophilized polysulfone membranes show less static adsorption and lower UF¯ux reduction than hydrophobic unmodi®ed membranes. In all experiments we found that the higher the degree of carboxylation or sulfonation, the greater this effect. High ionic strengths reduced these advantages at pH values above or below the IEP but had a positive effect at the IEP. #

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“…Flux losses during UF occur through various mechanisms including: adsorption, steric hindrance, pore plugging and concentration polarization or gel layer formation [1,2]. These contributions have been modelled phenomenologically using series resistance (SR) models [3] or combined osmotic pressure-adsorption (OPA) models [1].…”

Section: Flux Modelsmentioning

confidence: 99%

Effect of adsorptive fouling on membrane performance: Case study with a pulp mill effluent

et al. 1995

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The compatibility of a wide range of membrane materials with a pulp mill effluent was evaluated with respect to adsorptive fouling. Membranes were initially evaluated by their pure water permeability and separation characteristics with a polyethylene glycol test solute. These membrane coupons were contacted with a pulp mill effluent sample at 50°C in the absence of a transmembrane pressure for 3 h and then recharacterized. The change in the separation and permeation was interpreted as changes in the average pore size and the ratio of the number of pores to the effective pore length (n/AxA) of the membrane. A decreasing pore size indicated the formation of an adsorbed fouling layer. An increased n/AxA ratio suggested that adsorption occurred on the membrane surface rather than in the pores.

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Membrane pore characterization—comparison between single and multicomponent solute probe techniques

Cited by 108 publications

References 12 publications

Effect of addition of two-dimensional ZIF-L nanoflakes on the properties of polyethersulfone ultrafiltration membrane

Effect of addition of two-dimensional ZIF-L nanoflakes on the properties of polyethersulfone ultrafiltration membrane

Static protein adsorption, ultrafiltration behavior and cleanability of hydrophilized polysulfone membranes

Effect of adsorptive fouling on membrane performance: Case study with a pulp mill effluent

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