Interpreting rejection in SRNF across grafted ceramic membranes through the Spiegler-Kedem model

Merlet, Renaud B.; Tanardi, Cheryl; Vankelecom, Ivo F.J.; Nijmeijer, Arian; Winnubst, Louis

doi:10.1016/j.memsci.2016.12.013

Cited by 20 publications

(20 citation statements)

References 40 publications

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“…This is clearly shown by both small standard deviations for pure solvent permeation data and good reproducibility within a membrane batch. In accordance with previous work from other research groups like , this approach achieves a more consistent wetting of the porous structure and enhances solvent sorption on the pore walls and – if the membranes have been superficially modified by a polymeric coating on the top layer oxide – supports swelling and conditioning of the organic grafting. As consequence, the membrane performance can be improved and allows for generating reliable data for parameter regression in model development.…”

Section: Resultsmentioning

confidence: 97%

Reproducible Measurement Results in Organic Solvent Nanofiltration with Ceramic Membranes

Lechner

Brösigke

Repke

2018

Chemie Ingenieur Technik

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Ceramic membranes are still quite innovative to organic solvent nanofiltration. Nevertheless, flux and rejection results obtained in filtration measurements seem to depend largely on the experimental procedure, membrane production batch and setup. Therefore, an experimental approach is described, which proved to provide reproducible and reliable results that may be used as data set to derive parameters in model development.

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Section: Resultsmentioning

confidence: 97%

Reproducible Measurement Results in Organic Solvent Nanofiltration with Ceramic Membranes

Lechner

Brösigke

Repke

2018

Chemie Ingenieur Technik

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“…KKM is considered as another alternate to osmotic pressure one, in which the imperfect retention of the solutes by the RO/NF/UF membranes is incorporated by a reflection coefficient in the equation of the final output flux [50,51]:…”

Section: Kedem-katchalsky Model [Kkm]mentioning

confidence: 99%

Recent Drifts in pH-Sensitive Reverse Osmosis

Ibrahim¹,

El-Gammal²

2018

Wastewater and Water Quality

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Preparation of some smart PAm-ZTS pH-responsive membranes, via reactions between ZTS and PAm under different conditions, was conducted for testing pressure-driven reverse osmosis membranes (PDROMs) in active rejection of Ce 4+ ,Pr 3+ ,Sm 3+ ,Gd 3+ ,Dy 3+ , and Ho 3+ ionic lanthanide species in their 3 + and 4 + states. Recent theoretical models to designate the membrane operations were mathematically itemized, after selective characterization of the PDROMs. The pH scale response of the membrane was confirmed using static adsorption and hydraulic pervasion result estimations. The flux across the PAm-ZTS membrane decreased with the lowering pH value, with drastic decreases between pH 4 and 7, and was both reversible and durable with pH shifts between~3 and~8. At lower pH 3, the individual pores were in a closed-state due to the prolonged structure of the amide chains on the porous surfaces. In contrast, at pH 8, the higher pH value, the membrane pores were in an open-state format, because of the collapsed structures of the amide chains. This grants a clear possible approach for manufacturing some pHresponsive composite membranes and inspires further design for their stimuli-responsive actions by incorporating molecularly designed macromolecules, synthesized by controlled polymerization.

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“…The swelling of the active layer in solvents is an important parameter that influences the membrane performance, that is, permeance and selectivity . Low membrane permeance can be attributed to low swelling of the active layer, but high swelling results in low selectivity or low membrane stability, hence, the swelling degree of PIL‐based membranes must be restricted. This can be achieved by the addition of a cross‐linker monomer (i.e., PIL gel) and by the choice of the PIL monomer and counterion .…”

Section: Introductionmentioning

confidence: 99%

Thin‐Film Composite Polyionic Liquid Gel Membranes and Their Potential for Nanofiltration in Organic Solvents

Alkharabsheh

Bernstein

2018

Adv Materials Inter

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processes, [13][14][15][16] membrane modification, [17] and fabricating nanocomposite and mixed matrix membranes. [1,[18][19][20][21][22][23] Lately, research on SRNF membranes has focused on fabricating membranes from completely new materials such as graphene and other carbon materials, [24][25][26] metal hydroxides, [27] and metal-organic framework membranes, [28,29] or from new polymers. [30][31][32][33][34] One very promising group of materials for SRNF TFC membranes is polyelectrolyte (PE). PE-based SRNF membranes fabricated by layer-by-layer deposition or coating techniques [35][36][37] showed promising high selectivities, however, their permeabilities were low. [38] The low solubility of PEs in organic solvents due to charge condensation as well as thick active layers were probably the two main reasons for the low permeabilities. [39] Reducing the active layer thickness by decreasing the number of layers improved the permeability, but also reduced the selectivity. [38] Other approaches to increasing the permeability of PE-based membranes included incorporating graphene oxide nanosheets into the PE, [40] fabricating an ionically crosslinked asymmetric PE membrane, [41] using a weak PE [42] and a branched PE. [38] A promising new type of PE for fabricating SRNF TFC membranes which is yet to be explored is polymeric ionic liquids (PILs). PILs are solid, strong PEs that carry an ionic liquid species (cationic or anionic) constrained to the repeating units in the PE chain. [43] Unlike traditional PEs, in organic solvents PILs can swell and their counterion is delocalized, depending on the polymer and counterion types, mainly due to the hydrophobic character of the counterion and the reduced Coulombic interactions. [43,44] The swelling of the active layer in solvents is an important parameter that influences the membrane performance, that is, permeance and selectivity. [35] Low membrane permeance can be attributed to low swelling of the active layer, [45,46] but high swelling results in low selectivity or low membrane stability, [38,47,48] hence, the swelling degree of PILbased membranes must be restricted. This can be achieved by the addition of a cross-linker monomer (i.e., PIL gel) and by the choice of the PIL monomer and counterion. [49,50] Membrane permeance is also proportional to the active layer thickness: high permeability requires a thin active layer. [14,38] The selectivity of crosslinked PE-based nanofiltration membranes is proportional to the surface charge and the membrane molecular weight cutoff, namely, the cross-linker density. [35,38] The Polymeric ionic liquid (PIL) gels can serve as a promising material for the fabrication of solvent resistance nanofiltration (SRNF) membranes, given the solubility and the high delocalization of the counterion of PILs in organic solvents. This research describes the fabrication of a new thin-film composite membrane (TFC) with a crosslinked PIL (i.e., PIL gel) as an active layer and demonstrates its great potential as an SRNF membrane. A hydrophobic and positiv...

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Interpreting rejection in SRNF across grafted ceramic membranes through the Spiegler-Kedem model

Cited by 20 publications

References 40 publications

Reproducible Measurement Results in Organic Solvent Nanofiltration with Ceramic Membranes

Reproducible Measurement Results in Organic Solvent Nanofiltration with Ceramic Membranes

Recent Drifts in pH-Sensitive Reverse Osmosis

Thin‐Film Composite Polyionic Liquid Gel Membranes and Their Potential for Nanofiltration in Organic Solvents

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