Poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) membranes for ethyl acetate removal from water

Tian, Xiaohui; Jiang, Xue

doi:10.1016/j.jhazmat.2007.08.029

Cited by 94 publications

(26 citation statements)

References 27 publications

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“…During P(VDF-co-HFP) membrane preparation using acetone and DMAc, respectively, as solvent [100], dipolar intermolecular interaction between P(VDF-co-HFP) and DMAc induced polar γ phase, which is absent (only the α phase is present) [101,102] or limited (α is present with few β and γ phases) [103] in the P(VDF-co-HFP) interatomic C-F bond so that the bond carries a permanent strong electric moment. This is believed to promote the electroactive phase formation.…”

Section: Using Pvdf Copolymersmentioning

confidence: 99%

Crystalline polymorphism in poly(vinylidenefluoride) membranes

Cui

Hassankiadeh

Zhuang

et al. 2015

Progress in Polymer Science

345

250

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Section: Using Pvdf Copolymersmentioning

confidence: 99%

Crystalline polymorphism in poly(vinylidenefluoride) membranes

Cui

Hassankiadeh

Zhuang

et al. 2015

Progress in Polymer Science

345

250

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“…In addition, another type of PDVF copolymer, PVDF-TrFE was used to prepare membranes for lithium-ion battery [17]. PVDF-HFP, as another commonly used PVDF-based copolymer, has also been widely investigated, not only on the optimization of the membrane preparation protocols [18][19][20], but also on its potential applications from ethyl acetate separation [21] to lithium-ion batteries [22,23].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of hydrophobic flat sheet and hollow fiber membranes from PVDF and PVDF-CTFE for membrane distillation

Wang

Zheng

et al. 2016

Journal of Membrane Science

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a b s t r a c tHydrophobic polyvinylidene fluoride (PVDF) membranes have been used in membrane distillation, however its performance in terms of permeation flux and salt rejection still needs to be improved. In this study, polyvinylidenedifluoride-co-chlorotrifluoroethylene (PVDF-CTFE), a PVDF based copolymer, was employed to fabricate both flat sheet and hollow fiber membranes. Two pore forming additives (PEG and LiCl) were used in order to examine their effects on the membrane micro-structure and consequently the distillation performance. The crystalline property of the polymers was studied via X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) to reveal its role in the membrane formation. The membrane morphology (SEM), surface property (AFM) and membrane properties (contact angle, pore size, porosity and pore size distribution) were systematically examined and compared among PVDF, PVDF-CTFE membranes as well as their counterparts with pore forming additives. The results revealed that PVDF-CTFE membrane exhibited optimal membrane morphology, pore structure and hydrophobicity, thus delivering better distillation performance (permeation flux up to 62.09 kg/m 2 h, and distillate conductivity as low as 5 μS/cm) in comparison with their PVDF membrane counterparts.

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“…Recently, membrane separation has drawn a great deal of attention due to the high effectiveness of VOCs removal by membrane techniques such as pervaporation and membrane distillation [12][13][14][15][16][17][18]. Both polymer membranes [19][20][21][22] and ceramic membranes [15][16][17][18] have been intensively used. Compared to polymer membranes, ceramic membranes are more thermally stable, chemically resistant and resistant to swelling, which is ascribed to their inorganic chemical and phase composition [16].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Silica Membranes Silylated by Fluorinated and Non-Fluorinated Alkylsilanes for the Separation of Methyl Tert-Butyl Ether from Water

Wang

Yang

et al. 2020

Membranes

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It is of great significance to separate hazardous methyl tert-butyl ether (MTBE) from water in terms of environmental protection and human health. In the present work, α-Al 2 O 3 -suppotred silica membranes were prepared by the sol-gel and dip-coating technique. Two fluorinated alkylsilanes (1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) and trifluoropropyltriethoxysilane (TFPTES)) and two non-fluorinated alkylsilanes (octyltriethoxysilane (OTES) and propyltriethoxysilane (PTES)) were adopted to silylate the silica membrane by the post-grafting method which is used for the separation of MTBE from water by pervaporation. The results show that silylation enhances the hydrophobicity of silica membranes. The silylated silica membranes are selective towards MTBE, and the MTBE/water separation factor varies with grafting agents in the order: PFOTES > TFPTES > OTES > PTES. Membranes silylated with fluorinated carbon chains seem to be more selective towards MTBE than those with non-fluorinated carbon chains. The total flux is proportional to the pore volume of silica membranes, which depends on grafting agents in the order: PTES > PFOTES > OTES > TFPTES. Considering both total flux and selectivity, the PFOTES-SiO 2 membrane is most effective in separation, with a MTBE/water separation factor of 24.6 and a total flux of 0.35 kg m −2 h −1 under a MTBE concentration of 3.0% and a feed temperature of 30 • C.There are various reports related to the application of ceramic membranes, i.e., TiO 2 , Al 2 O 3 , ZrO 2 , zeolite and SiO 2 membranes in VOCs removal from water [15][16][17][18]23,24]. As a kind of common material, silica membrane has been used in gas separation [25,26], membrane reactor [27], and desalination [28] due to its intrinsic merits, for instance, ease of preparation, tunable pore size, relatively low cost and so on. Pristine silica membrane is generally believed to be hydrothermally unstable owing to the presence of hydrophilic surface hydroxyl groups, which tend to physically adsorb water. The attack of physically adsorbed water leads to further hydrolysis and condensation of silica species, thus resulting in structure deterioration [29]. Fortunately, the hydrothermal stability of silica membrane has been significantly enhanced by replacing hydroxyl groups with hydrophobic groups [26], so that hydrophobic silica membranes can be applied in an aqueous environment such as desalination [28]. To the best of our knowledge, only a few mesoporous silica membranes have been reported previously on the separation of VOCs from aqueous solution by pervaporation [30][31][32]. Pervaporation is considered as a separation process for liquid mixture not only by dense membranes, but also by porous membranes, especially microporous and mesoporous membranes [23,24,31,32]. Compared to conventional separation methods, pervaporation has numerous advantages; for instance, it can be utilized for the separation of azeotropes and close-boiling point mixtures [33]. Pervaporation is advantageous for the separation of VOCs from water...

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Poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) membranes for ethyl acetate removal from water

Cited by 94 publications

References 27 publications

Crystalline polymorphism in poly(vinylidenefluoride) membranes

Crystalline polymorphism in poly(vinylidenefluoride) membranes

Fabrication of hydrophobic flat sheet and hollow fiber membranes from PVDF and PVDF-CTFE for membrane distillation

Mesoporous Silica Membranes Silylated by Fluorinated and Non-Fluorinated Alkylsilanes for the Separation of Methyl Tert-Butyl Ether from Water

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