The deduction of fine structural details of asymmetric nanofiltration membranes using theoretical models

Ismail, Ahmad Fauzi; Hassan, Abdul Rahman

doi:10.1016/j.memsci.2003.10.024

Cited by 28 publications

(19 citation statements)

References 11 publications

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“…Bowen and Mohammad [7] reported that a high value of X d could maximize the Donnan effects of membrane which resulted in effective removal of dye and salt from a dye-salt-water waste stream. Ismail and Hassan [9,10] also found that the appearance of charge density determined the extent of NF performances towards NaCl rejections. Besides the effect of charge density on retention characteristics, membrane surface charge is also important to minimize fouling tendency by reducing the absorption of negatively charged foulants in the feed water [11].…”

Section: Introductionmentioning

confidence: 91%

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Influence of feed conditions on the rejection of salt and dye in aqueous solution by different characteristics of hollow fiber nanofiltration membranes

Ismail

Lau

2009

Desalination and Water Treatment

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A B S T R A C TThree different characteristics of self-made hollow fiber nanofiltration (NF) membranes with different structural and electrical properties were evaluated for their suitability for removing salt and colour as a function of feed conditions. Results showed that NF achieved promising dye retention for the reactive dyes used at different concentrations and varied slightly with pH. The retention of salt was found to be dependent on feed properties and membrane electrical properties where higher retentions were achieved under alkaline condition and by using the most negatively charged NF membrane. The enhancement in the membrane negative surface charge resulting from the addition of sulfonated poly (ether ether ketone) (SPEEK) during membrane preparation had also made the NF less fouling-sensitive to dye absorption and improving the economic viability of the treatment process.

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Section: Introductionmentioning

confidence: 91%

“…Previously, Ismail and Hassan had succeed to deduce the structural and electrical properties of NF membranes by means of solute retention based on the theoretical models [9,10,12]. By having these properties it becomes possible for potential users to choose NF membrane which is best suited to particular process requirement.…”

Section: Introductionmentioning

confidence: 99%

Influence of feed conditions on the rejection of salt and dye in aqueous solution by different characteristics of hollow fiber nanofiltration membranes

Ismail

Lau

2009

Desalination and Water Treatment

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“…In the previous studies, we reported that the fine structural details of cellulose acetate (CA) NF membranes that could be deduced by employing the theoretical models 20. The findings of this study demonstrated that the shear rate has a great influence on the structural and electrical properties due to the shear induced molecular orientation in the skin layer of the membrane.…”

Section: Introductionmentioning

confidence: 74%

“…Teorell‐Meyer‐Sievers (TMS) model is a rigorous approach that has been widely used to describe quantitatively the electrical properties of NF by assuming uniform radial distribution of fixed charges and mobile species on membrane surface 20–23. By combining the extended Nernst‐Planck model and the Donnan equilibrium theory, the parameters σ salt and P salt of a membrane can be determined using a mono–mono type electrolyte (NaCl) as feed solution.…”

Section: Teorell‐meyer‐sievers Modelmentioning

confidence: 99%

Theoretical studies on structural and electrical properties of PES/SPEEK blend nanofiltration membrane

Ismail

Lau

2009

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).Polyethersulfone (PES) nanofiltration membranes were prepared using a simple dryjet wet spinning technique with different contents of sulfonated poly(ether ether ketone) (SPEEK) ranging from 0 to 4 wt %. The structural parameters (r p and A k /Dx) and electrostatic properties (n and X) of the blend membranes were deduced by employing the combination of irreversible thermodynamic model, steric hindrance pore (SHP) model, and Teorell-Meyer-Sievers (TMS) model. The modeling results obtained have been analyzed and discussed. The mean pore radius and pore size distribution of the blends were also determined based on the theoretical models. The results showed that pore radius increased with increasing the concentration of SPEEK from 0 to 2 wt % but decreased with a further increase in SPEEK content. The water flux, however, showed a systematically increase with increasing SPEEK content. The SPEEK also showed significant effect on membrane electrical properties. Both effective charge density and ratio of effective charge density to electrolyte solution increased with increasing concentration of SPEEK in the dope solution, reaching a value of À21.02 and À2.29, respectively. The pore radius which was determined by using different transport models has also been analyzed and discussed. It is found that the addition of SPEEK into dope solution is one of the paramount parameters in developing the negatively charged nanofiltration membrane with enhanced water flux while retaining the pore radius in the nanometer range. V

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“…The combination between steric and electrostatic allows NF membranes more effective for the separations of mixtures of organic molecules and salts. An NF membranes main feature is that most of them are charged either positively or negatively depends on their materials [2].…”

Section: -2506mentioning

confidence: 99%

The Effect of Polymer Concentration and Surfactant Types on Nanofiltration-Surfactant Membrane for Textile Wastewater

Hassan¹

2016

MJAS

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In this study, an asymmetric nanofiltration-surfactant (NFS) membrane was prepared via simple dry/wet phase inversion technique. A newly dope formulation consisting of different surfactants (SDS, CTAB) and polymer concentration (17 wt% -21 wt%) were developed. The effect of these parameters on dyes performance in terms of dyes flux, rejection and morphological structure were examined. Experimental data showed that, at different ranges of polymer concentration, NFS membranes shows low permeation flux of dyes ranging from 9.256 L/m 2 h to 14.315 L/m 2 h at 4 bar operating pressure. Significantly, the addition of SDS and CTAB surfactants were found to promote the increasing of dyes flux and rejection up to 79.698 L/m 2 h and 99.5% respectively. Addition of surfactant shows the membrane surface morphology with upper layer and support layer consists of finger-like structure, finger-like channel, macrovoids and spongy structure.Keywords: nanofiltration, surfactant, flux, rejection, morphological structure Abstrak Dalam kajian ini, membran surfaktan penurasan-nano telah disediakan melalui teknik fasa berbalik kering/basah mudah. Satu formulasi baru polimer yang terdiri daripada surfaktan yang berbeza (SDS,CTAB) dan kepekatan polimer (17 wt% -21 wt%) telah disediakan. Kesan parameter ini terhadap prestasi pewarna dari segi fluks warna, penolakan dan struktur morfologi telah diperiksa. Data ujikaji menunjukkan bahawa, pada jarak yang berbeza kepekatan polimer, keputusan fluks membran NFS menyerap rendah pewarna antara 9.256 L/m 2 h kepada 14.315 L/m 2 h pada 4 bar tekanan operasi. Lebih penting lagi, penambahan SDS dan CTAB sebagai surfaktan didapati menggalakkan peningkatan fluks pewarna dan penolakan sehingga masing -masing adalah 79.698 L/m 2 h dan 99.5%. Penambahan surfaktan menunjukkan morfologi permukaan membran dengan lapisan atas dan lapisan sokongan yang terdiri daripada struktur jejari, saluran jejari, makrovoid dan struktur lembut.Kata kunci: penurasan-nano, surfaktan, fluks, penolakan, struktur morfologi Introduction Nanofiltration (NF) membrane one of the promising technologies which has been largely developed and commercialized for the separation of neutral and charged solutes in the aqueous solutions. NF membranes has two remarkable features which are has molecular weight cut-off (MWCO) between reverse osmosis (RO) membranes

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The deduction of fine structural details of asymmetric nanofiltration membranes using theoretical models

Cited by 28 publications

References 11 publications

Influence of feed conditions on the rejection of salt and dye in aqueous solution by different characteristics of hollow fiber nanofiltration membranes

Influence of feed conditions on the rejection of salt and dye in aqueous solution by different characteristics of hollow fiber nanofiltration membranes

Theoretical studies on structural and electrical properties of PES/SPEEK blend nanofiltration membrane

The Effect of Polymer Concentration and Surfactant Types on Nanofiltration-Surfactant Membrane for Textile Wastewater

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