Preparation of a positively charged nanofiltration membrane based on hydrophilic–hydrophobic transformation of a poly(ionic liquid)

Tang, Ying; Tang, Beibei; Wu, Peiyi

doi:10.1039/c5ta01823d

Cited by 41 publications

(18 citation statements)

References 55 publications

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“…7,8 However, these membranes are usually negatively charged as a result of the hydrolyzation of residual acyl chloride groups during the IP process. 9,10 This means that NF membranes have high rejection to multivalent anions but are less effective for rejecting multivalent cations according to Donnan exclusion. 11 To effectively increase the rejection of multivalent cations, polyethyleneimine (PEI), a polymer carrying numerous primary and secondary amine groups, began to be widely used in fabricating NF membranes that can reject multivalent cations effectively.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a novel nanofiltration membrane with chlorine-tolerant property and good separation performance

Liu

Lin

et al. 2018

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a novel nanofiltration membrane with chlorine-tolerant property and good separation performance

Liu

Lin

et al. 2018

RSC Adv.

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“…The zeta potential for PPA barrier layers of PPA-PAN-AA/PA and PPA/PAN nanobrous composite membranes were determined based on streaming potential method with an homemade electrokinetic analyzer which is customized according to the structure that described in the literature. 30 The streaming potential was measured by forcing the electrolyte solutions (KCl, 0.001 mol L À1 , pH ¼ 6.0) with operation pressure at 0.010 MPa at 25 AE 0.5 C. The resulting electrical potential difference (DE) as the pressure difference across the membrane (DP) changed was measured through a digital multimeter (UT33D, Uni-Trend, China) using reversible Ag/AgCl electrodes, which were placed on both sides of the thin slit channel. Then an equivalent zeta potential (x) can be deduced from these measurements according to the Helmholtz-Smoluchowski equation.…”

Section: Characterizations Of the Resultant Membranesmentioning

confidence: 99%

A durable thin-film nanofibrous composite nanofiltration membrane prepared by interfacial polymerization on a double-layer nanofibrous scaffold

Yang

Shen

et al. 2017

RSC Adv.

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“…For the past decade, PIL‐based membranes have been investigated for many applications, most commonly for gas separation, particularly CO 2 , as electrolyte membranes for fuel cells and batteries, and as porous membranes . Other PIL‐based membranes, such as nanofiltration membranes for water treatment, membranes for water–oil separation, pervaporation membranes, and responsive membranes, have also been explored. These membrane were either freestanding films, or, have been fabricated by phase inversion, casting or coating methods, chemical vapor deposition, postfunctionalization, or PIL polymerization on a polymeric support …”

Section: Introductionmentioning

confidence: 99%

“…Other PIL‐based membranes, such as nanofiltration membranes for water treatment, membranes for water–oil separation, pervaporation membranes, and responsive membranes, have also been explored. These membrane were either freestanding films, or, have been fabricated by phase inversion, casting or coating methods, chemical vapor deposition, postfunctionalization, or PIL polymerization on a polymeric support …”

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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Preparation of a positively charged nanofiltration membrane based on hydrophilic–hydrophobic transformation of a poly(ionic liquid)

Abstract: A positively charged NF composite membrane with high permeability was obtained via a simple counter-ion exchange reaction in an aqueous solution, due to the hydrophilic–hydrophobic transformation of the PIL.

Cited by 41 publications

References 55 publications

Preparation and characterization of a novel nanofiltration membrane with chlorine-tolerant property and good separation performance

Preparation and characterization of a novel nanofiltration membrane with chlorine-tolerant property and good separation performance

A durable thin-film nanofibrous composite nanofiltration membrane prepared by interfacial polymerization on a double-layer nanofibrous scaffold

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

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