Modification of porous poly(vinylidene fluoride) membrane using amphiphilic polymers with different structures in phase inversion process

Zhao, Yanfang; Qian, Yanling; Zhu, Bao‐Ku; Xu, Yuan

doi:10.1016/j.memsci.2007.11.040

Cited by 191 publications

(80 citation statements)

References 36 publications

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“…Although an extensive series of studies has been carried out to fabricate various PVDF membranes in order to improve membrane properties, most of them are focused on preparation of flat sheet membranes (Lin et al 2002;Fontananova et al 2006;Buonomenna et al 2007;Seol et al 2007) and hydrophilic composite hollow fiber membranes (Singh et al 2005;Feng et al 2006;Wu et al 2006;Zhao et al 2008;Zhou & Xi 2008). On the contrary, as far as we know, less research has been conducted on the fabrication and characterization of hydrophobic porous PVDF hollow fiber membranes mainly for the MD process.…”

Section: Introductionmentioning

confidence: 99%

Preparation of hydrophobic PVDF hollow fiber membranes for desalination through membrane distillation

Hou

Wang

et al. 2009

Water Science and Technology

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Fabrication of polyvinylidene fluoride (PVDF) hydrophobic asymmetric hollow fiber membranes was studied by introducing inorganic salt LiCl and water soluble polymer polyethylene glycol (PEG) 1500, using N,N-dimethylacetamide (DMAc) as solvent and tap water as the coagulation medium. The membranes properties also were tested and characterized. It is found that the nonsolvent additive can increase membranes porosity, ether LiCl or PEG 1500. Because of the addition of PEG 1500, the PVDF membranes obtained a rough topography on the membrane surface and the contact angle of the PVDF membranes increased to 113.508 compared to 89.828 of the PVDF membranes spun without an additive. During direct contact membrane distillation (DCMD) of 0.6 M sodium chloride solution, the PVDF membranes spun with PEG 1500 as a non-solvent additive achieved higher water permeation flux compared to the membranes spun from PVDF/DMAc and PVDF/DMAC/LiCl dopes, but the latter two membranes exhibited higher salt rejection rate.

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Section: Introductionmentioning

confidence: 99%

Preparation of hydrophobic PVDF hollow fiber membranes for desalination through membrane distillation

Hou

Wang

et al. 2009

Water Science and Technology

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“…Furthermore, PVDF is chemically stable to a wide range of chemical products such as halogens, oxidants, inorganic acids and aromatic, aliphatic and chlorinated solvents (Hashim et al, 2011). These PVDF properties associated with its low price, radiation resistance, low surface energy and dielectric constant have made it one of the most popular and usual polymers for microfiltration (MF) and ultrafiltration (UF) membranes (Lui et al, 2007;Zhao et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, PVDF membranes have limitations for water, sewage and aqueous mixtures treatment (Lui et al, 2007;Zhao et al, 2008), which restricts the use of this kind of polymer.…”

Section: Introductionmentioning

confidence: 99%

“…In order to incorporate hydrophilic proprieties into conventional hydrophobic PVDF membranes for better performance, several membrane modification methods have been explored (Zhao et al, 2008). The blending modification method is ordinarily used to obtain the desired functional properties during membrane synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…The blending modification method is ordinarily used to obtain the desired functional properties during membrane synthesis. In this way, the synthesis and modification processes can be performed in only one step (Zhao et al, 2008). Until now, three main types of additives have been used for PVDF membrane modification: hydrophilic polymers or pore-forming (polyvinylpyrrolidone -PVP and poly(methyl methacrylate) -PMMA), amphiphilic copolymers (P(MMA-r-POEM) or P(MMA-r-PEGMA); PVDF-g-POEM; PVDF-g-PMAA; PVDF-g-PEGMA; PVDF-g-PAAc; PVDFg-PAAc-b-PNIPAAM; PVDF-g-PTMASPMA and HPE-g-MPEG) and inorganic particles (TiO 2 ; SiO 2 ; Al 2 O 3 and ZrO 2 ) (Liu et al, 2011b).…”

Section: Introductionmentioning

confidence: 99%

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Clay nanoparticles effects on performance and morphology of poly(vinylidene fluoride) membranes

Morihama

Mierzwa

2014

Braz. J. Chem. Eng.

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-In this study, a comparison between neat poly(vinylidene fluoride) (PVDF) membrane and composite (PVDF-Nanoclay and PVDF-PVP-Nanoclay) membranes is presented. All membranes were synthesized by the phase inversion process, using 18% PVDF, n-methylpyrrolidone as solvent and water as the non-solvent. Demineralized water cross-flow permeation tests were conducted to evaluate the membranes performance. Scanning electron microscopy (SEM) images of the membranes surface and cross-section and water contact angle measurements were used to estimate additives effects on membranes morphology. The results indicate that dopant addition affected membrane permeate flux and morphology. The 4% nanoclay composite membrane resulted in the highest ultrapure water permeability (0.9130 m 3 .m -2 .h -1 .MPa -1 ), lower hydraulic resistance (3.27×10 +12.m -1 ), lower contact angle (87.1º) and highest surface porosity (0.95%). Furthermore, it was verified that the membrane surface porosity increased with increasing clay nanoparticles concentrations. It was observed that the morphology of the membranes with clay nanoparticle addition is characterized by a thin surface layer, with macro-pores, a thin bottom layer, which has a sponge-like structure with micro-pores and a thick intermediate layer, with finger-like pores and macro-pores. It was also verified that the introduction of PVP promotes a denser morphology compared with membranes without it. Based on the SEM surface and cross-sectional images and permeability tests, it became evident that the internal pore morphology plays an important role in membrane performance, because the higher the frequency and extent of the finger-like pores in the intermediate layer the higher is the membrane permeability. These preliminary results indicated that the use of nanoclay as an additive for membrane casting is a promising procedure for improving membrane performance for water and wastewater treatment.

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Polymer Filtration Membranes

Asatekin

Mayes

2009

Encyclopedia of Polymer Science and Technology

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Polymer filtration membranes have been a focus of research since the late eighteenth century and became a thriving industry in the twentieth century. Today, membranes are used in commercial applications spanning from drinking water purification to gas separations, with a market that is expected to grow to more than $10 billion by 2010. This article describes the materials and morphologies commonly found in today's commercial membranes, along with their methods of manufacture. Membranes classified according to retentate size as microfiltration, ultrafiltration, nanofiltration, or reverse osmosis are introduced, along with ion exchange and gas separation membranes. The primary mechanisms by which these different membranes achieve separation during filtration are described, as well as example applications. Permeability, molecular weight cutoff, and rejection/retention are introduced as metrics for membrane performance comparisons. Membrane fouling is discussed as a chief obstacle to the more widespread use of membranes in wastewater treatment and other applications involving high concentrations of organics in the feed stream. Mechanisms of membrane fouling are described along with approaches commonly employed to limit fouling, including membrane surface modification, process optimization, and pretreatment of the feed. The future outlook of the polymer filtration membrane industry is touched upon in the context of increasing demand for fresh water and continuing improvements in membrane performance anticipated by research advances.

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Modification of porous poly(vinylidene fluoride) membrane using amphiphilic polymers with different structures in phase inversion process

Cited by 191 publications

References 36 publications

Preparation of hydrophobic PVDF hollow fiber membranes for desalination through membrane distillation

Preparation of hydrophobic PVDF hollow fiber membranes for desalination through membrane distillation

Clay nanoparticles effects on performance and morphology of poly(vinylidene fluoride) membranes

Polymer Filtration Membranes

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