Fabrication of ion-exchange ultrafiltration membranes for water treatment

Mbareck, Chamekh; Nguyen, Quang Trong; Alexandre, Stéphane; Zimmerlin, Irène

doi:10.1016/j.memsci.2005.10.058

Cited by 91 publications

(22 citation statements)

References 35 publications

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“…A comparison of Figure 2 a with Figure 2 b shows a partial reduction in the voidage of the former. Similar to previous research on PES/PAA blended membranes, [ 32,33 ] there is no indication of polymer-polymer phase separation. Hence it may be safely concluded that there was good interpenetration of PES and PAA polymer chains in the membrane.…”

Section: Preparation Of Ag/agcl Nanocomposite Membranesupporting

confidence: 87%

“…[ 33 ] The actual water fl ux is then a balance of these two competing factors. The hydrophilicity of the membranes in this study was evaluated by water contact angle measurements.…”

Section: Effect Of Ag/agcl Nanocomposite Coating On Membrane Hydrophimentioning

confidence: 99%

“…PAA is a polymeric additive commonly used in membrane preparation to introduce hydrophilicity and ion-exchange properties. [32][33][34][35] Since the p K a of PAA is ≈4.75 and lower than the p K a of water (7.0), the PAA carboxylic groups are nearly completely ionized in water. Hence the presence of PAA could introduce negative charge to the PES-based substrate.…”

Section: Introductionmentioning

confidence: 99%

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Dual‐Functional Coating of Forward Osmosis Membranes for Hydrophilization and Antimicrobial Resistance

Qing

Zhou

et al. 2016

Adv Materials Inter

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Microbial fouling and internal concentration polarization (ICP) are factors limiting the performance of forward osmosis (FO) membranes. These limitations in flat sheet thin film composite (TFC) FO membranes are mitigated by a single Ag/AgCl nanocomposite coating in this study. The coating is prepared by first adsorbing Ag+ on the negatively charged carboxylate groups of polyacrylic acid (PAA)‐polyethersulfone (PES) blend membrane substrate (support layer). Cl− ions are introduced next to form a conformal AgCl coating in situ. Irradiation of the coating with visible light then converts it into a composite coating with nano‐Ag(n‐Ag) on the membrane substrate exterior and AgCl in the membrane substrate interior. The Ag/AgCl‐coated membranes prepared as such deliver good antimicrobial resistance concurrently with a high water flux. The antimicrobial performance can be attributed to a high loading of n‐Ag on the membrane exterior while the high water flux to the AgCl hydrophilization of the membrane interior which reduces the ICP. To the best of our knowledge, this is probably the first demonstration of a dual‐functional coating for FO TFC membranes.

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Section: Preparation Of Ag/agcl Nanocomposite Membranesupporting

confidence: 87%

“…[ 33 ] The actual water fl ux is then a balance of these two competing factors. The hydrophilicity of the membranes in this study was evaluated by water contact angle measurements.…”

Section: Effect Of Ag/agcl Nanocomposite Coating On Membrane Hydrophimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dual‐Functional Coating of Forward Osmosis Membranes for Hydrophilization and Antimicrobial Resistance

Qing

Zhou

et al. 2016

Adv Materials Inter

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“…Poly(acrylic acid) (PAA) is a commercial polymer and has been intensively used as additives during preparation of PSF and PES UF membranes by phase separation methods. 35,36 It is a simple method that makes it possible to fabricate, at low price, membranes that contain active carboxyl groups and hydrophilicity while keeping the PSF and PES advantages.…”

Section: Introductionmentioning

confidence: 99%

“…[37][38][39] For example, when PAA was blended directly with other polymer as described in the literature, 35 the elution of PAA was unavoidable due to its water dissolubility. It seems that an increase molecular weight of hydrophilic additive enhances the entanglements of the soluble additive chains with membrane material chains, thus improving the retention of additive chains in the membrane matrix.…”

Section: Introductionmentioning

confidence: 99%

Tethering methoxy polyethylene glycols to improve the antifouling property of PSF/PAA‐blended membranes

Cao

Kang

et al. 2011

J of Applied Polymer Sci

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Poly(acrylic acid) (PAA) was used as an additive to fabricate blended polysulfone (PSF) ultrafiltration (UF) membranes. Hexanediamine was used as a crosslinking agent to react with PAA and formed an active surface with amine group. Then, an end carboxyl group methoxy polyethylene glycol (MPEG) was grafted on the membrane surface via an amidation reaction. Water contact angle measurement indicated that the surface hydrophilicity of PSF/PAA-blended membranes and MPEGmodified membranes remarkably increased. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR/FTIR) was used to confirm the existence of PAA in the blended membranes and the change of chemical composition. Membrane surface and cross-sectional morphologies were observed by scanning electron microscope. The flux of pure water increased slightly after modification, while the rejection to bovine serum albumin had no obvious change. The improvement of antifouling property for MPEG-modified membrane was accordant with the increase of PAA content in PSF/PAA-blended membranes. Protein UF experiments revealed that membrane fouling, especially irreversible membrane fouling, was remarkably reduced due to the incorporation of MPEG. The long-term protein UF experiment demonstrated the improvement of recycling property and the reliability of modification.

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Stimuli‐Responsive Membranes

Wee

Bai

2013

Encyclopedia of Membrane Science and Technology

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Recent advances in design and preparation of stimuli‐responsive membranes (SRMs), and their uses in areas such as molecular filtration, engineering separation, controlled capture/release, etc. are presented and critically assessed in this article. The underlying principles for actualization and response of various types of SRMs are first reviewed, with respect to their constituent stimuli‐responsive polymers or chemical functionality. Then, the various membrane preparation methods and processes that facilitate the incorporation of the stimuli‐responsive polymers, molecules, or additives to alter the membrane properties (e.g., permeability and selectivity) are discussed, in response to either the change in environmental conditions (e.g., solution pH and temperature) or the presence of an externally applied field (e.g., electric field, magnetic field). Design parameters that play important roles in shaping the manner and extent at which the trigger response from SRMs is actualized are also discussed and elucidated. Potential engineering applications that integrate such novel membranes or associated systems are also presented to illustrate their vast potential in tackling various health and sustainability issues.

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Fabrication of ion-exchange ultrafiltration membranes for water treatment

Cited by 91 publications

References 35 publications

Dual‐Functional Coating of Forward Osmosis Membranes for Hydrophilization and Antimicrobial Resistance

Dual‐Functional Coating of Forward Osmosis Membranes for Hydrophilization and Antimicrobial Resistance

Tethering methoxy polyethylene glycols to improve the antifouling property of PSF/PAA‐blended membranes

Stimuli‐Responsive Membranes

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