Facile fabrication of nanofiber- and micro/nanosphere-coordinated PVDF membrane with ultrahigh permeability of viscous water-in-oil emulsions

Wu, Jindan; Ding, Yajie; Wang, Jianqiang; Li, Tiantian; Lin, Hua‐Tay; Wang, Jiping; Liu, Fu

doi:10.1039/c8ta01539b

Cited by 138 publications

(65 citation statements)

References 46 publications

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“…The random distribution of beads when using 5 ml as a spinning volume might be due to the high repulsion between the beads, which leads to formation large micro-gaps on the membrane surface. Similar behaviour has previously been reported by Wu et al [35] when spraying 10 wt% of PVDF solution which they attributed to the affinity of small beads towards larger beads.…”

Section: Surface Morphologysupporting

confidence: 89%

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

et al. 2018

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Membrane pore wetting is the main problem hindering long term stability of permeate flux quality in membrane distillation (MD) applications. A superhydrophobic membrane with micro and nanostructured surface features can offer a unique solution to resolve this issue. Thus, a modified electrospun membrane was fabricated using a combination of electrospinning and electrospraying. The membrane surface hydrophobicity was enhanced by constructing a beaded structure from spraying a mixture of non-fluorinated alumina (Al2O3) nanoparticles (NPs) mixed with low concentration of PVDF polymer on an electrospun base membrane made from PVDF. The results revealed that a rough surface with a hierarchical structure can be constructed, which could not only enhance the membrane hydrophobicity, but also further enhance the permeate efficiency by improving parameters such as flux and rejection. Additionally, the membrane hydrophobicity could be further tuned by controlling the bead spinning volume. Our study shows that the modified membrane with 7.8µm beads layer thickness has boosted the liquid entry pressure (LEP) by 61% from 15.5 psi and the water contact angle to 154 o. The performance of modified membranes with different spraying volume (1-5 ml) along with the neat electrospun and commercial membranes were examined in an air gap membrane distillation (AGMD) application for 5 hours using a 2.5 wt% of synthetic heavy metal solution as a wastewater model. Then, the optimized superhydrophobic membrane with 2 ml spinning volume (ES15-2) was further tested in comparison with the commercial membrane during long-term operations (30 h) using 3.5 wt% of mixed heavy metals. The flux was 18.67 LMH (L m −2 h −1) for modified membrane (ES15-2) compare with 12.62 LMH for commercial PVDF membrane during 30 h of long-term operation with feed and coolant temperature at 60 o C, 20 o C, respectively. The present superhydrophobic membrane fabricated by a combined electrospinning/electrospray method shows high potential for MD applications.

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Section: Surface Morphologysupporting

confidence: 89%

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

et al. 2018

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“…From the optical micrographs of W/T emulsion before and after filtration, highly emulsified water droplets, ranging from 3 to 10 µm, were efficiently removed. More notably, D 4 is commonly used as intermediate in cosmetic, printing, and rubber industry . Therefore, the effective separation of high viscosity W/D 4 emulsion is of great significance in terms of environmental and economic considerations.…”

Section: Resultsmentioning

confidence: 99%

“…The used W/O emulsions were prepared by mixing oils and water with the volume ratio of 99:1, where Span 80 (1 mg mL −1 ) was used as emulsifier. Typically, the water was added dropwise into the oil under vigorous stirring conditions, and then the mixture was ultrasonically treated for 1 h to form a stable milky emulsion.…”

Section: Methodsmentioning

confidence: 99%

Nonflammable and Magnetic Sponge Decorated with Polydimethylsiloxane Brush for Multitasking and Highly Efficient Oil–Water Separation

Liu

Wang

Feng

2019

Adv Funct Materials

189

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Developing sponge materials integrating excellent flame retardancy, multitasking separation performance, and efficient emulsion-breaking ability is significant but challenging for the remediation of oil spills causing fires and environmental damages. Herein, a superhydrophobic oil-water separation sponge material, containing a melamine-formaldehyde (MF) sponge substrate, magnetic polydopamine (PDA) coating, and branched polydimethylsiloxane (PDMS) brush, through dopamine-mediated surface initiated atom transfer radical polymerization (SI-ATRP) is fabricated. The synergistic flame resistance of the MF substrate and PDMS brush significantly improves its adaptability in fire. More importantly, the decorated PDMS brushes can effectively overcome the size mismatch between sponge macropores and tiny emulsified droplets, while remaining the intrinsic macroporous characteristic. When treating W/O emulsions, the PDMS brushes stretch up to act as "interface-breaking blades" to accelerate the coalescence of emulsified water droplets. Meanwhile, such PDMS brushes can serve as "oil-trapping tentacles" to efficiently capture oil droplets when treating O/W emulsions. Such material design synergistically contributes to satisfactory separation efficiency (98.7%) and ultrahigh permeation flux (up to 1.35 × 10 5 L m −2 h −1 ), even for treating high viscosity emulsions. Besides, the reported sponge also inherits robust durability, superior recyclability, and convenient magnetic collection. These features make the sponge promising for multitasking and highly efficient oil-water separation.

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“…As a technology that can prepare large‐area nanofibers membrane with controllable structures and component, [ 12 ] electrospinning method had been used to fabricate many superwetting separation membranes. [ 13 ] Recently, several kinds of composite membranes with superwettability were fabricated by electrospinning. [ 14 ] The highly porous nanofibers membrane exhibited high separation flux for various oil/water mixture system.…”

Section: Methodsmentioning

confidence: 99%

A Robust Carbon Nanotube and PVDF‐HFP Nanofiber Composite Superwettability Membrane for High‐Efficiency Emulsion Separation

Wang

Yue

et al. 2020

Macromol. Rapid Commun.

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Oil or chemical purification is significant not only for industrial safety production but also because it conforms to the principle of sustainable development. In this paper, based on the synergistic concept of superwettability and nanopores sieve effect, a superoleophilic and under‐oil superhydrophobic carbon nanotube/poly(vinylidene fluoride‐co‐hexafluoropropylene) nanofiber composite membrane is prepared via electrospinning, pressure‐driven filtration, and chemical vapor modification. The as‐prepared membrane with durable mechanical and chemical stabilities achieves separation efficiency higher than 99.9% and high flux up to 632.5 L m−2 h−1 bar−1 for different water‐in‐oil emulsions. This membrane is highly promising for the petroleum and chemical industries for both product quality improvement and green recycling manufacturing processes.

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Facile fabrication of nanofiber- and micro/nanosphere-coordinated PVDF membrane with ultrahigh permeability of viscous water-in-oil emulsions

Abstract: A superhydrophobic, superoleophilic and under oil superhydrophobic poly (vinylidene fluoride) (PVDF) nanofibrous membrane was developed through a facile electrospinning strategy.

Cited by 138 publications

References 46 publications

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

Nonflammable and Magnetic Sponge Decorated with Polydimethylsiloxane Brush for Multitasking and Highly Efficient Oil–Water Separation

A Robust Carbon Nanotube and PVDF‐HFP Nanofiber Composite Superwettability Membrane for High‐Efficiency Emulsion Separation

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