Surface modification of ultrafiltration membranes by preadsorption of a negatively charged polymer

Reddy, A.V.R.; Mohan, Dinesh; Bhattacharya, Amit; Shah, Vatsal; Ghosh, Pushpito K.

doi:10.1016/s0376-7388(02)00547-1

Cited by 203 publications

(58 citation statements)

References 36 publications

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“…In contrast, G2 and G3 resulted in greater permeate fl ux resistance, consistent with higher pore blockage of the support. [ 19 ] Though the pore size of the PES support is not known, the molecular weight cut-off reported by the manufacturer is in the range of 0.9 to 2.3 kDa. plateaus at ca.…”

Section: Synthesis and Characterization Of Aramide Dendrimersmentioning

confidence: 99%

“…[ 10 ] Such high water permeability ( A D = 5.2 m/(MPa · d)) was comparable to that of the G3 membrane and slightly larger than that of the G2 membrane (Supporting We believe that G2 could impact more the membrane fl ow rate compared to G3 since the molecular weight of G2 is in the range of the PES cut-off, closer to the upper limit, and it could therefore cause more pore blockage. [ 19 ] The permeate samples collected from the percolation experiments were analyzed by UV-vis spectroscopy to provide direct information about the amount of dendrimers in the permeate solutions as a function of the percolation time (Figure 4 b-d).…”

Section: Synthesis and Characterization Of Aramide Dendrimersmentioning

confidence: 99%

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Nanofiltration Membranes with Modified Active Layer Using Aromatic Polyamide Dendrimers

Gao

Jubera

Mariñas

et al. 2012

Adv Funct Materials

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The modification of a commercial nanofiltration (NF) membrane (TFC‐S) with shape‐persistent dendritic molecules is reported. Amphiphilic aromatic polyamide dendrimers (G1–G3) are synthesized via a divergent approach and used for membrane active layer modification by direct percolation. The permeate samples collected from the percolation experiments are analyzed by UV‐visible spectroscopy to monitor the influence of dendrimer generations on percolation behavior and active layer modification. Further characterization of modified membranes by Rutherford backscattering spectrometry and atomic force microscopy techniques reveals a relatively low‐level accumulation of dendrimers inside the original TFC‐S NF membrane active layer and subsequent formation of a coating of pure aramide dendrimers on top of the active layer. A PES‐PVA ultrafiltration membrane is used as a control membrane support (without an NF active layer) showing that structural compatibility between the dendrimers and support plays an important role in the membrane modification process. The performance of the modified TFC‐S membrane is evaluated on the basis of the rejection abilities for a variety of water contaminants having a range of molecular size and chemistry. As the water flux is inversely proportional to the thickness of the active layer, the amount of dendrimers deposited for specific contaminants are optimized to improve the solute rejection while maintaining high water flux.

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Section: Synthesis and Characterization Of Aramide Dendrimersmentioning

confidence: 99%

Section: Synthesis and Characterization Of Aramide Dendrimersmentioning

confidence: 99%

Nanofiltration Membranes with Modified Active Layer Using Aromatic Polyamide Dendrimers

Gao

Jubera

Mariñas

et al. 2012

Adv Funct Materials

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“…The application of ultrafiltration is seriously limited by membrane fouling. In the last years, many researchers have revealed that increasing the hydrophilicity of the membrane surfaces and pore surfaces can remarkably reduce or suppress membrane fouling [77][78][79][80][81][82][83]. Accordingly, hydrophilic molecules, such as poly(ethylene glycol) (PEG) and zwitterionic molecules, have been widely used to modify the ultrafiltration membranes [84][85][86].…”

Section: Protein-adsorption-resistant Membranesmentioning

confidence: 99%

Phosphorus‐Containing Polysulfones

Petreuş¹,

Petreuş

2011

High Performance Polymers and Engineering Plastics

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“…14 Compared with hydrophobic membranes, the membranes with hydrophilic surface have great advantage in reducing protein adsorption and deposition. 15,16 To resolve the fouling problem, a number of approaches, such as coating, 17 blend, 18,19 surface graft polymerization, 20,21 and chemical modification [22][23][24][25] have been reported in the literatures to reduce the membrane fouling. A particularly effective hydrophilic polymer for surface modification is poly(ethylene glycol) (PEG) due to its excellent resistance to protein adsorption and inherent biocompatibility.…”

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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Surface modification of ultrafiltration membranes by preadsorption of a negatively charged polymer

Cited by 203 publications

References 36 publications

Nanofiltration Membranes with Modified Active Layer Using Aromatic Polyamide Dendrimers

Nanofiltration Membranes with Modified Active Layer Using Aromatic Polyamide Dendrimers

Phosphorus‐Containing Polysulfones

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

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