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

    Year: 2021

    Journal: Cellulose, Volume 28, MAY, page 4357–4370

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

    Organizations: Natural Science Foundation of Jiangsu Province [BK20171450]; National Key Research and Development Program of China [2017YFD0601005]; Foundation of State Key Laboratory of Biobased Material and Green Papermaking [KF201804]; Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

    Keywords: Paper-based composite; High-wetstrength; Underwater superoleophobic; Emulsification oil separation

    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 degrees 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)center dot bar(-1) for the emulsified soybean oil with the average size of 13 mu m, 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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