PAN/PVA composite nanofibrous membranes for separating oil-in-water emulsion

In this work, nanofibrous membranes for separating oil-in-water (O/W) emulsion were prepared by electrospinning. The membrane material was polymer blend of polyacrylonitrile (PAN)/polyvinyl alcohol (PVA), and by adjusting polymer composition and concentration, as well as applying crosslinking by glu...

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Bibliographic Details
Published in:Journal of polymer research 2022-04, Vol.29 (4), Article 108
Main Authors: Guo, Hui, Zhang, Dong, Jiang, Lanying
Format: Article
Language:English
Subjects:
Aqueous environments
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Contact angle
Crosslinked polymers
Crosslinking
Glutaraldehyde
Hydrolysis
Industrial Chemistry/Chemical Engineering
Membranes
Original Paper
Polyacrylonitrile
Polymer blends
Polymer Sciences
Polymers
Polyvinyl alcohol
Surface active agents
Surfactants
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Summary:In this work, nanofibrous membranes for separating oil-in-water (O/W) emulsion were prepared by electrospinning. The membrane material was polymer blend of polyacrylonitrile (PAN)/polyvinyl alcohol (PVA), and by adjusting polymer composition and concentration, as well as applying crosslinking by glutaraldehyde (GD ) and hydrolysis inside NaOH solution, membrane with desired properties, particularly hydrophilicity and underwater oil repellency were obtained. For PAN/PVA composite membrane modified by glutaraldehyde for 1.5 h and NaOH for 1.5 h, the water contact angle initially was around 5° and decreased to 0 o with a transition time of only 0.3 s. The membrane also showed recommendable performance in O/W emulsion separation. Under a driving force of 0.8 kPa, the highest starting flux of 953 L/m 2 h and 532 L/m 2 h were registered with the treatment of surfactant-free emulsion (SFE) and surfactant-stabilized emulsion (SSE), respectively. The membrane recovered 96% of its initial flux in a 5-cycle reusability test using SFE, and the oil rejection coefficient maintained higher than 97%. FTIR and XPS characterizations confirmed the success in chemical modifications. It was also found that glutaraldehyde crosslinking helped to improve the macroscopic structure integrity of the membrane in aqueous environment.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-022-02954-2