One-step facile fabrication of PVDF/graphene composite nanofibrous membrane with enhanced oil affinity for highly efficient gravity-driven emulsified oil/water separation and selective oil absorption

Zhang, Tai; Xiao, Changfa; Zhao, Jianqing; Liu, Xiaozhen; Ji, Dawei; Zhang, Hui

doi:10.1016/j.seppur.2020.117576

Cited by 60 publications

(21 citation statements)

References 42 publications

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“…The synthesized composite membrane revealed an outstanding water-in-oil emulsions separation efficiency, reaching 99.8%. These results show that the composite nanofibrous membrane shows great promise in the remediation of wastewater from oil [ 77 ]. Cheng, Barras [ 78 ] have successfully prepared a superoleophilic/superhydrophobic reduced graphene oxide-polydopamine functionalized with 1H,1H,2H,2H-perfluorodecanethiol (rGO-PDA-PFDT) membrane via a simple and facile two-step method.…”

Section: Graphene-based Membranes In Oil/water Separationmentioning

confidence: 99%

“…The nanocomposite membranes provided are very promising, and are highly efficient membranes for oil-in-water emulsion separation with a high capability of de-oiling high salinity emulsions under harsh industrial conditions [ 76 ]. Zhang, Xiao [ 77 ] fabricated a superoleophilic and under oil superhydrophobic poly (vinylidene fluoride) (PVDF)/graphene (GE) composite nanofibrous membrane (GPNM) via a simple one-step electrospinning method for gravity-driven surfactant-stabilized water-in-oil emulsions separation. The synthesized composite membrane revealed an outstanding water-in-oil emulsions separation efficiency, reaching 99.8%.…”

Section: Graphene-based Membranes In Oil/water Separationmentioning

confidence: 99%

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Recent Developments and Advancements in Graphene-Based Technologies for Oil Spill Cleanup and Oil–Water Separation Processes

et al. 2021

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The vast demand for petroleum industry products led to the increased production of oily wastewaters and has led to many possible separation technologies. In addition to production-related oily wastewater, direct oil spills are associated with detrimental effects on the local ecosystems. Accordingly, this review paper aims to tackle the oil spill cleanup issue as well as water separation by providing a wide range of graphene-based technologies. These include graphene-based membranes; graphene sponges; graphene-decorated meshes; graphene hydrogels; graphene aerogels; graphene foam; and graphene-coated cotton. Sponges and aerogels modified by graphene and reduced graphene oxide demonstrated effective oil water separation owing to their superhydrophobic/superoleophilic properties. In addition, oil particles are intercepted while allowing water molecules to penetrate the graphene-oxide-coated metal meshes and membranes thanks to their superhydrophilic/underwater superoleophobic properties. Finally, we offer future perspectives on oil water separation that are hindering the advancements of such technologies and their large-scale applications.

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Section: Graphene-based Membranes In Oil/water Separationmentioning

confidence: 99%

Section: Graphene-based Membranes In Oil/water Separationmentioning

confidence: 99%

Recent Developments and Advancements in Graphene-Based Technologies for Oil Spill Cleanup and Oil–Water Separation Processes

et al. 2021

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“…[12,23,24] Poly(vinylidene fluoride) (PVDF), a semicrystalline polymer, is often used to prepare membrane due to its excellent physical and chemical properties, such as chemical resistance, thermal stability, and hydrophobicity. [1,22,23] The PVDF separation layer prepared by the NIPS method is generally composed of surface layer, finger-like macropores, and spongy pores. However, its surface layer is generally dense, and the interconnection of spongy pore structure is slightly poor, so the membrane permeation flux is low.…”

Section: Robust Preparation and Pore Structure Design Of Homogeneous ...mentioning

confidence: 99%

Robust Preparation and Pore Structure Design of Homogeneous Braid‐Reinforced PVDF Hollow Fiber Membrane

Yan

Xiao

2022

Adv Materials Inter

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In this work, the homogeneous braid‐reinforced poly(vinylidene fluoride) (PVDF) hollow fiber membrane with multiple pore structure is prepared successfully based on a nonsolvent‐induced phase separation (NIPS) method by adding different dioctyl phthalate (DOP) contents into the casting solution. The addition of DOP will restrict the phase separation process to avoid forming finger‐like macropores, while the placeholder and movement of DOP are conducive to the formation of more microporous and through holes. It is found that when the DOP content is 13%, the membrane has a porous surface layer with large surface pores and a cross section with bicontinuous structure. Compared with the membrane prepared without DOP, the separation flux of the membrane increases by 407% while maintaining a higher separation efficiency. Moreover, the prepared membranes reveal outstanding mechanical properties, and their tensile strength all exceeds 100 MPa. These findings indicate that the method may open more opportunities for the pore structure design based on the NIPS method.

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“…The fiber obtained by electrospinning has the advantages of small diameter, large specific surface area, and high porosity [24,25], which are very suitable for water transportation, liquid separation, and so on. The morphology and structure of the fiber can be effectively controlled by changing the parameters to achieve the purpose of optimizing the fiber material [26][27][28]. Previous studies have proved that the directional transportation of liquids can be achieved by rationally designing the difference in the surface microstructure of the material [29,30] or changing the chemical composition of the surface of the material [31].…”

Section: Introductionmentioning

confidence: 99%

A Janus Mesh with Robust Interface and Controllable Wettability for Water Transport

Guo

Gao

et al. 2022

Journal of Nanomaterials

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The rational design of material structure is of great importance to the membrane material in water manipulation and management. Among them, by designing materials and structures on both sides of Janus membranes with porous structures, membranes with opposite wettability can be prepared to show directional liquid transport effects. However, the Janus membrane has the weakness of interfacial bonding due to the difference in the material and structure of the two layers. Here, we report a method to improve the interfacial bonding force of the two layers. Janus membrane is prepared using polyvinylidene fluoride hexafluoropropylene (PVDF-HFP) and cellulose acetate (CA) through the electrospinning method and then treated with sodium hydroxide (NaOH) solution. The as-prepared Janus membrane has a hydrophilic-hydrophobicity gradient and a strong bonding interface obtained by adjusting the chemical composition and microstructure. The NaOH solution plays a dominant role in forming hydrophilic-hydrophobicity gradient and enhancing the interface bonding between the bilayer membranes. The results show that this Janus membrane can achieve the purpose of oil-water separation and one-way water transmission by absorbing oil and regulating liquid surface tension. This strategy provides new ideas and technical supports for improving the Janus membrane interfacial bonding force and expands potential applications in the future.

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One-step facile fabrication of PVDF/graphene composite nanofibrous membrane with enhanced oil affinity for highly efficient gravity-driven emulsified oil/water separation and selective oil absorption

Cited by 60 publications

References 42 publications

Recent Developments and Advancements in Graphene-Based Technologies for Oil Spill Cleanup and Oil–Water Separation Processes

Recent Developments and Advancements in Graphene-Based Technologies for Oil Spill Cleanup and Oil–Water Separation Processes

Robust Preparation and Pore Structure Design of Homogeneous Braid‐Reinforced PVDF Hollow Fiber Membrane

A Janus Mesh with Robust Interface and Controllable Wettability for Water Transport

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