Characterization and retention of UF membranes using PEG, HS and polyelectrolytes

Hilal, Nidal; Al‐Abri, Mohammed; Al-Hinai, Hilal

doi:10.1016/j.desal.2006.02.077

Cited by 33 publications

(11 citation statements)

References 34 publications

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“…(7) (Bhattacharjee and Datta, 1997;Hilal et al, 2007;Sherwood et al, 1975), where M j (in kg/kmol or Da) is the PEG molecular weight of the j fraction.…”

Section: Characterization Proceduresmentioning

confidence: 97%

“…Moreover, taking into account the observed and the intrinsic rejections, both parameters can be related using the wellknown Eq. (5) (Hilal et al, 2007).…”

Section: Characterization Proceduresmentioning

confidence: 98%

“…(6) (Bhattacharjee and Datta, 1997;Hilal et al, 2007;Nguyen et al, 1980), where D is the bulk diffusivity of the PEG molecular weight fraction j, r is the stirred cell radius (0.02 m), m is the bulk viscosity (8.93 Á 10 À 4 Pa s at 25 1C), ρ is the bulk density (997 kg/m 3 at 25 1C) and ω is the stirring rate (42 rad/s).…”

Section: Characterization Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Ageing of polyethersulfone ultrafiltration membranes under long-term exposures to alkaline and acidic cleaning solutions

Antón

Alvarez

Palacio

et al. 2015

Chemical Engineering Science

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“…(7) (Bhattacharjee and Datta, 1997;Hilal et al, 2007;Sherwood et al, 1975), where M j (in kg/kmol or Da) is the PEG molecular weight of the j fraction.…”

Section: Characterization Proceduresmentioning

confidence: 97%

“…Moreover, taking into account the observed and the intrinsic rejections, both parameters can be related using the wellknown Eq. (5) (Hilal et al, 2007).…”

Section: Characterization Proceduresmentioning

confidence: 98%

See 1 more Smart Citation

Ageing of polyethersulfone ultrafiltration membranes under long-term exposures to alkaline and acidic cleaning solutions

Antón

Alvarez

Palacio

et al. 2015

Chemical Engineering Science

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“…In this study, aqueous solutions of several polyethylene glycols (PEG), with molecular ranging from 300 to 1200 Da, were used and filtered through three commercially available asymmetric membranes. Hilal et al [15] also characterize ultrafiltration membranes through the film theory. [18] and Bakhshayeshi et al ( 2012) [19] , solute rejection was calculated using the convectivediffusive model of Opong and Zydney [20] .…”

Section: Introductionmentioning

confidence: 98%

Membrane Characterization Based on PEG Rejection and CFD Analysis

Baldasso

Pinto

Silveira

et al. 2015

Separation Science and Technology

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Characterization of membrane pore size by experimental methods is usually done by the determination of the rejection of polymeric molecules having a range of sizes such as PEG. These experiments are affected by concentration polarization, which can lead to erroneous interpretation of the results, mainly because the concentration and the permeate flux change along the membrane surface. Additionally, experimental methods alone are insufficient to obtain the membrane pore size. To improve the current approach, numerical methods are used to understand mass transport limitations in rejection experiments and to predict the membrane pore size. In the current study, the results show that the ultrafiltration membrane has a MWCO of 20 kDa, different from the value set by the manufacturer (30 kDa). For the experimental conditions, concentration dependent viscosity and osmotic pressure do not influence the permeate flow rate or rejection. Moreover, the membrane pore size was found to be 2.59 nm. This value was determined comparing rejection values obtained by numerical and experimental results. Numerical analysis is also important to characterize the flow and mass transport in each point at membrane surface.

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“…It is defined as the molecular weight (dynamic radius) of a solute with which a given membrane has a sieving coefficient (So) less than0.1. Diluted, uncharged solutes of different molecular weights are rejected and a sieving curve plot of retention versus the molar mass or solute radius can be created (Platt et al 2002;Hilal et al 2007). As shown in Fig.…”

Section: 37mentioning

confidence: 99%

Investigating the Usability of Alkali Lignin as an Additive in Polysulfone Ultrafiltration Membranes

2015

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The effects of natural and synthetic polymer additives on the properties of ultrafiltration membranes were studied. The use of NaOH to remove the residual additive remaining in the membranes during coagulation was also investigated, as was the effect of NaOH post-treatment relative to membrane performance. To evaluate the residual additives present, ATR-FTIR was used. Contact-angle analysis and water-absorption experiments were used to examine the hydrophilic properties of the prepared membranes. Membranes modified with lignin (Lig) were found to absorb more water (94% water uptake) than other membranes. In general, the contact angles were found to be low for membranes treated with NaOH. Membrane permeability was greatest in lignin_polysulfone (Lig_PSf), followed by polyvinylpyrrolidone_polysulfone (PVP_PSf), and with polyethylene glycol_polysulfone (PEG_PSf) the least permeable, similar to the trend observed in water uptake. A 'Robeson plot' analogue showed that Lig_PSf membranes had high separation factors regardless of the size of the solute being rejected. This study indicates the feasibility of using cheap, readily available additives to increase the performance of membranes.

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Characterization and retention of UF membranes using PEG, HS and polyelectrolytes

Cited by 33 publications

References 34 publications

Ageing of polyethersulfone ultrafiltration membranes under long-term exposures to alkaline and acidic cleaning solutions

Ageing of polyethersulfone ultrafiltration membranes under long-term exposures to alkaline and acidic cleaning solutions

Membrane Characterization Based on PEG Rejection and CFD Analysis

Investigating the Usability of Alkali Lignin as an Additive in Polysulfone Ultrafiltration Membranes

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