Preparation and characterization of anti-fouling PVDF membrane modified by chitin

Abstract Poly(vinylidene fluoride) (PVDF)/chitin (CH) blend membranes were prepared via the method of immersion-precipitation phase transformation with the solvent system N,N-dimethylacetamide (DMAc)/lithium chloride (LiCl) as solvent and water as coagulant. The effect of CH on membrane structure and performance was investigated. Owing to the strong hydrophilicity, CH chains enriched on the blend membrane surface and improved the hydrophilicity of the membrane. The addition of CH also led to the formation of finger-like pores and the increase of pore size and porosity. The flux and the flux recovery ratio (FRR) of the blend membrane were higher than that of pure PVDF membrane. The fouling resistance of the blend membrane was lower than that of PVDF original membrane. In a word, the addition of CH to PVDF membrane improved the hydrophilicity and the anti-fouling ability of PVDF membrane.

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Hydrophilic modification of poly(vinylidene fluoride) ultrafiltration membranes by surface UV photo-grafting with N,N′-methylene-bisacrylamide as monomer and Ce(IV) as initiator

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2015.089 ◽

2015 ◽

Vol 6 (2) ◽

pp. 280-289

Author(s):

Baoli Shi ◽

Zheng Li ◽

Xing Su

Keyword(s):

Vinylidene Fluoride ◽

Membrane Surface ◽

Ultrafiltration Membranes ◽

Water Contact ◽

Pvdf Membrane ◽

Hydrophilic Modification ◽

Poly Vinylidene Fluoride ◽

Modified Membrane ◽

Porosity Measurements ◽

Pure Pvdf

A UV photo-grafting method was utilised to enhance the hydrophilicity and anti-fouling property of self-made poly(vinylidene fluoride) (PVDF) ultrafiltration membranes. N,N′-methylene-bisacrylamide (MBAA) was used as monomer and Ce(IV) was used as initiator to obtain balance between grafting treatment consumption and enhanced performance. MBAA could be grafted onto the surface of pure PVDF membranes through a water-phase grafting method under UV photoradiation. When the MBAA concentration was 0.07 mol/L, the Ce(IV) concentration was 0.04 mol/L, and the irradiation duration was 3 min, the membrane surface was grafted with a sufficient amount of monomer under a UV photoradiation intensity of 5.0 mW/cm2. The water contact angle on the surface of the modified membrane decreased by approximately 16°, and flux recovery increased by approximately 40% compared with the pure PVDF membrane when treating river water. For bovine serum albumin rejection and porosity measurements no significant changes were observed between pure PVDF and graft-treated membranes. The enhanced performance of the modified membrane in this work was moderate, but the UV irradiation duration (3 min) was short. The integrative effects of UV modification in this work were satisfactory when both irradiation duration and enhanced performance were considered.

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Preparation and performance of polymer electrolyte based on poly(vinylidene fluoride)/polysulfone blend membrane via thermally induced phase separation process for lithium ion battery

Journal of Power Sources ◽

10.1016/j.jpowsour.2014.05.056 ◽

2014 ◽

Vol 266 ◽

pp. 401-413 ◽

Cited By ~ 58

Author(s):

Qiao Cheng ◽

Zhenyu Cui ◽

Jiangbo Li ◽

Shuhao Qin ◽

Feng Yan ◽

...

Keyword(s):

Phase Separation ◽

Vinylidene Fluoride ◽

Lithium Ion ◽

Separation Process ◽

Thermally Induced Phase Separation ◽

Thermally Induced ◽

Blend Membrane ◽

Phase Separation Process ◽

Poly Vinylidene Fluoride ◽

And Performance

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Enhanced antifouling ability of a poly(vinylidene fluoride) membrane functionalized with a zwitterionic serine-based layer

RSC Advances ◽

10.1039/c6ra19067g ◽

2016 ◽

Vol 6 (88) ◽

pp. 85612-85620 ◽

Cited By ~ 5

Author(s):

Jing Zhu ◽

Dapeng Liu ◽

Chunju He

Keyword(s):

Free Radical ◽

Vinylidene Fluoride ◽

Membrane Surface ◽

Cross Linking ◽

Surface Immobilization ◽

Pvdf Membrane ◽

Poly Vinylidene Fluoride ◽

Antifouling Ability

Antifouling PVDF membrane was fabricated through covalently surface immobilization of zwitterionic serine-based layer via facile free radical cross-linking polymerization of serine methacrylate (SerMA) on membrane surface.

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Anti-Fouling and Anti-Bacterial Modification of Poly(vinylidene fluoride) Membrane by Blending with the Capsaicin-Based Copolymer

Polymers ◽

10.3390/polym11020323 ◽

2019 ◽

Vol 11 (2) ◽

pp. 323 ◽

Cited By ~ 8

Author(s):

Xiang Shen ◽

Peng Liu ◽

Shubiao Xia ◽

Jianjun Liu ◽

Rui Wang ◽

...

Keyword(s):

Membrane Fouling ◽

Vinylidene Fluoride ◽

Pure Water ◽

Radical Copolymerization ◽

Inversion Method ◽

Pvdf Membrane ◽

Poly Vinylidene Fluoride ◽

And Performance ◽

Phase Inversion Method ◽

Enhanced Surface

Membrane fouling induced by the adsorption of organic matter, and adhesion andpropagation of bacteria onto the surfaces, is the major obstacle for the wide application of membranetechnology. In this work, the capsaicin-based copolymer (PMMA-PACMO-Capsaicin) wassynthesized via radical copolymerization using methyl methacrylate (MMA), N-acrylomorpholine(ACMO) and 8-methyl-N-vanillyl-6-nonenamide (capsaicin) as monomers. Subsequently, thecapsaicin-based copolymer was readily blended with PVDF to fabricate PVDF/PMMA-PACMOCapsaicinflat sheet membrane via immersed phase inversion method. The effects of copolymerconcentration on the structure and performance of resultant membranes were evaluatedsystematically. With increase of PMMA-PACMO-Capsaicin copolymer concentration in the castingsolution, the sponge-like layer at the membrane cross-section transfers to macroviod, and the poresize and porosity of membranes increase remarkably. The adsorbed bovine serum albumin protein(BSA) amounts to PVDF/PMMA-PACMO-Capsaicin membranes decrease significantly because ofthe enhanced surface hydrophilicty. During the cycle filtration of pure water and BSA solution, theprepared PVDF/PMMA-PACMO-Capsaicin membranes have a higher flux recovery ratio (FFR) andlower irreversible membrane fouling ratio (Rir), as compared with pristine PVDF membrane.PVDF/PMMA-PACMO-Capsaicin membrane is found to suppress the growth and propagation ofStaphylococcus aureus bacteria, achieving an anti-bacterial efficiency of 88.5%. These results confirmthat the anti-fouling and anti-bacterial properties of PVDF membrane are enhanced obviously byblending with the PMMA-PACMO-Capsaicin copolymer.

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