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

Yu, Haijun; Cao, Yijun; Kang, Guodong; Liu, Jianhui; Li, Meng

doi:10.1002/app.35611

Cited by 11 publications

(9 citation statements)

References 51 publications

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“…In this study, however, the main objective of PAA addition was to enable chemical interactability between the PES substrate and Ca 2+ . In comparison with other hydrophilic polymers such as polyvinyl alcohol (PVA), the negative charge developed after PAA dissociation in water could chemically bond Ca + through electrostatic forces to initiate the CaCO 3 coating 32 33 34 35 . This property is derived from an abundance of carboxylic groups in PAA with pKa (4.75) lower than water (7.0).…”

Section: Resultsmentioning

confidence: 99%

Hydrophilic Mineral Coating of Membrane Substrate for Reducing Internal Concentration Polarization (ICP) in Forward Osmosis

Liu

Zhou

et al. 2016

Sci Rep

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Internal concentration polarization (ICP) is a major issue in forward osmosis (FO) as it can significantly reduce the water flux in FO operations. It is known that a hydrophilic substrate and a smaller membrane structure parameter (S) are effective against ICP. This paper reports the development of a thin film composite (TFC) FO membrane with a hydrophilic mineral (CaCO3)-coated polyethersulfone (PES)-based substrate. The CaCO3 coating was applied continuously and uniformly on the membrane pore surfaces throughout the TFC substrate. Due to the intrinsic hydrophilicity of the CaCO3 coating, the substrate hydrophilicity was significantly increased and the membrane S parameter was reduced to as low as the current best of cellulose-based membranes but without the mechanical fragility of the latter. As a result, the ICP of the TFC-FO membrane could be significantly reduced to yield a remarkable increase in water flux without the loss of membrane selectivity.

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Section: Resultsmentioning

confidence: 99%

Hydrophilic Mineral Coating of Membrane Substrate for Reducing Internal Concentration Polarization (ICP) in Forward Osmosis

Liu

Zhou

et al. 2016

Sci Rep

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“…Since water fl ux was improved after PAA addition, the hydrophilicity improvement effect clearly dominated over the pore shrinkage effect in this study. This is diametrically different from the observations in pressure driven processes [ 35 ] where the pore shrinkage effect predominates. The disagreement is due to the greater significance of substrate hydrophilicity as the main driving force for water transport in the absence of an externally applied pressure.…”

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

confidence: 57%

“…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%

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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“…Generally, the F‐MNPs with different molecular weights of PAA showed lower hydrodynamic diameters (Figure ). The stabilizing mechanism proposed here made a partition of the carboxyl groups of PAA wrapped around the surface wall of the MNPs. The polymers' carboxylic groups were exposed around the surface of the MNPs when the PAA polymer was physisorbed to the MNPs colloids.…”

Section: Resultsmentioning

confidence: 99%

Ultrafiltration of aquatic humic substances through magnetically responsive polysulfone membranes

Azmi

Low

2015

J of Applied Polymer Sci

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Organic foulants, such as humic acid substances, contribute to the irreversible fouling and flux decline in membrane separation processes. To reduce the membrane fouling potential, in this study, we explored the end‐capping of functionalized nanostructured magnetite (Fe3O4) with poly(acrylic acid) (PAA) on the surface of the polysulfone (PSF) membrane. The binding stability of PAA‐functionalized Fe3O4 [functionalized magnetite‐responsive nanoparticles (F‐MNPs)], combined with field emission scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and vibrating sample magnetometry, were studied to determine the deposited morphology and magnetic properties of F‐MNPs on the membrane surface. In addition, the fouling analysis of the modified (F‐MNPs‐PSF) and unmodified (PSF) membranes were also being investigated through the filtration study. The results show that the magnetically responsive F‐MNPs‐PSF membrane developed in this study achieved high efficiency for the removal of humic substances when they were exposed to an oscillating external magnetic field. During filtration, the external magnetic field indirectly generated a torque that twisted the deposited Fe3O4 on the membrane surface. The actuated iron oxides consecutively reduced the concentration polarization around the top surface of the membrane and sequentially reduced the fouling propensity. These results provide some insight into the membrane's antifouling stability, which could be useful for environmental remediation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41874.

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

Cited by 11 publications

References 51 publications

Hydrophilic Mineral Coating of Membrane Substrate for Reducing Internal Concentration Polarization (ICP) in Forward Osmosis

Hydrophilic Mineral Coating of Membrane Substrate for Reducing Internal Concentration Polarization (ICP) in Forward Osmosis

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

Ultrafiltration of aquatic humic substances through magnetically responsive polysulfone membranes

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