Developing a PVDF catalytic membrane with high permeability, fouling resistance and self-cleaning capability for efficient oil/water emulsion separation

Chen, Fengtao; Sun, Yueming; Wang, Heng; Yan, Haitao; Chen, Xiufang; Lü, Wangyang

doi:10.1016/j.reactfunctpolym.2023.105639

Reactive and Functional Polymers

2023

DOI: 10.1016/j.reactfunctpolym.2023.105639

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Developing a PVDF catalytic membrane with high permeability, fouling resistance and self-cleaning capability for efficient oil/water emulsion separation

Fengtao Chen

Yueming Sun

Heng Wang

et al.

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Cited by 8 publications

References 24 publications

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Antifouling Polyvinylidene Fluoride Membrane through Dopamine Self‐Polymerization Enhanced Surface Segregation toward Oil‐In‐Water Emulsions Separation

Li,

Liu,

Wei

et al. 2024

Adv Funct Materials

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Surface segregation method, as an in situ method for simultaneous modification of membrane external surfaces and inner pore surfaces, has been more commonly employed to fabricate antifouling membranes. In this study, dopamine (DA) with self‐polymerization and bio‐adhesion ability is chosen as a surface segregation agent to fabricate antifouling polyvinylidene fluoride (PVDF) membrane for oil‐in‐water emulsions separation through synergistically regulating phase inversion, self‐polymerization of DA, and surface segregation of poly‐dopamine (PDA). During the phase inversion process, DA contacts with an alkaline coagulation bath to trigger self‐polymerization of DA, then the surface segregation of PDA proceeds spontaneously. The addition and self‐polymerization of DA can regulate the phase inversion process to acquire membranes with high porosity, as a result, the water permeance is increased from 134 to 538 L m−2 h−1 bar−1 with the oil rejection higher than 99.8%. Because the hydrophilic PDA layer on membrane and pore surfaces leads to a robust hydration layer, the membrane exhibits super‐oleophobicity underwater and excellent antifouling properties with water recovery ratio of more than 99.4%. This study may open a new route to preparing antifouling membranes by using small molecules as surface segregation agents.

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Antifouling Polyvinylidene Fluoride Membrane through Dopamine Self‐Polymerization Enhanced Surface Segregation toward Oil‐In‐Water Emulsions Separation

Li,

Liu,

Wei

et al. 2024

Adv Funct Materials

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Improved performance of polyvinylidene fluoride membrane blended with modified multi‐walled carbon nanotubes by electret treatment

Shi,

Wang,

Hou

et al. 2023

J of Applied Polymer Sci

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In this paper, electret treatment was used to enhance the electrostatic repulsion between the membrane and bovine serum albumin, so as to improve the anti‐fouling ability and recycling rate of the membrane. The polarization charge is provided by the dipole orientation of polyvinylidene fluoride (PVDF) materials, and the space charge is composed of the interfacial charge between the filler and the matrix and the bulk charge of the hollow structure of the multi‐walled carbon nanotubes. The results showed that after electret treatment, the surface potential of the membrane increased, the PVDF crystal type changed from α to β, and the crystallinity increased. Grafting of N‐vinylpyrrolidone onto multi‐walled carbon nanotubes (MWCNTs‐g‐PVP), which contain a large number of hydrophilic groups after modification, reduces the contact angle of the composite film from 86.9° to 62.7°. The pure water flux and flux recovery rate of MWCNTs‐g‐PVP/PVDF composite membranes after electret treatment was increased from 189.31 L·m−2·h−1 and 90% to 233.55 L·m−2·h−1 and 94.7%, respectively, and the rejection rate increased about 30%. Through the circulation experiment, it can be seen that the anti‐fouling performance and recycling rate of the membrane is improved, which is caused by electrostatic repulsion.

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Experimental study of heat rejection performance of water membrane evaporator in vacuum environment

Chang,

Li,

Wang

2024

Applied Thermal Engineering

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Developing a PVDF catalytic membrane with high permeability, fouling resistance and self-cleaning capability for efficient oil/water emulsion separation

Cited by 8 publications

References 24 publications

Antifouling Polyvinylidene Fluoride Membrane through Dopamine Self‐Polymerization Enhanced Surface Segregation toward Oil‐In‐Water Emulsions Separation

Antifouling Polyvinylidene Fluoride Membrane through Dopamine Self‐Polymerization Enhanced Surface Segregation toward Oil‐In‐Water Emulsions Separation

Improved performance of polyvinylidene fluoride membrane blended with modified multi‐walled carbon nanotubes by electret treatment

Experimental study of heat rejection performance of water membrane evaporator in vacuum environment

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