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Published in: Cellulose 7/2021

03-03-2021 | Original Research

Underwater superoleophobic all-cellulose composite papers for the separation of emulsified oil

Authors: Jianfeng Xi, Shan Jiang, Yanling Lou, Hongqi Dai, Weibing Wu

Published in: Cellulose | Issue 7/2021

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Abstract

All-cellulose paper-based composites with underwater superoleophobicity and high-wet-strength were developed by casting a barrier layer of bacterial cellulose (BC) on a filter paper substrate. To optimize the pore structure of barrier layer, slow gel process of BC dispersion was conducted via acidification and solvent exchange. 1,2,3,4-butanetetracarboxylic acid was used to improve the wet strength and surface hydrophilicity through the crosslinking reaction between fibers. The underwater oil contact angles are higher than 150° in neutral environment, and slightly decrease under acid and alkali conditions. Combined with the micron-sized pore structure of BC barrier layer, the composite papers show good separation performance of oil-in-water emulsion. A denser BC layer can significantly improve the separation efficiency, but also lead to the reduction of flux. During the gelation of BC barrier layer, the increase in the ethanol/water ratio of the dispersion medium is able to increase the flux without obvious negative impact on the separation efficiency. When the ethanol/water ratio is 80%, the separation efficiency and water flux reach 99.2% and 1320 L m−2 h−1·bar−1 for the emulsified soybean oil with the average size of 13 μm, respectively. This type of all-cellulose composite papers provides a new idea for the fabrication of membrane materials for oil–water separation.

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Metadata
Title
Underwater superoleophobic all-cellulose composite papers for the separation of emulsified oil
Authors
Jianfeng Xi
Shan Jiang
Yanling Lou
Hongqi Dai
Weibing Wu
Publication date
03-03-2021
Publisher
Springer Netherlands
Published in
Cellulose / Issue 7/2021
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-021-03768-z

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