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    Hierarchical Al2O3/SiO2 fiber membrane with reversible wettability for on-demand oil/water separation

    Year: 2019

    Journal: Korean J. Chem. Eng., Volume 36, JAN, page 92–100

    Authors: Li, Zhangdi; Shi, Tianhui; Zhang, Tao; Guo, Qing; Qiu, Fengxian; Yue, Xuejie; Yang, Dongya

    Organizations: Natural Science Foundation of Jiangsu Province [BK20160500]; National Nature Science Foundation of China [21706100, 21878132, U1507115]; China Postdoctoral Science Foundation [2018T110452, 2017M621649, 2016M600373]; China Postdoctoral Science Foundation of Jiangsu Province [1701067C, 1701073C, 1601016A]; Key Research and Development Program of Jiangxi Province [20171BBH80008]

    Keywords: Al2O3 Nanosheets Coating; Fiber Membrane; Reversible Wettability; Oil; Water Separation; Recyclability

    This work presents an effective method of fabricating hierarchical Al2O3/SiO2 fiber membrane with reversible wettability for on-demand oil/water separation. In this strategy, the superhydrophilic/underwater superoleophobic surfaces are fabricated by in-situ growing hierarchical Al2O3 nanosheets on the SiO2 fiber surfaces that can be used as water-removing materials for oil/water separation. Then, the superhydrophobic/oleophilic surfaces are obtained by surface chemical modification with sodium laurate, which can be used as oil-removing materials for oil/water separation. Interestingly, the reversible wettability transformation of Al2O3/SiO2 fiber membrane can be controlled by the annealing and modification treatment alternately. The as-prepared Al2O3/SiO2 fiber membrane, combining the advantages and overcoming disadvantages of two modes, achieves reversible wettability transitions and on-demand oil/water separation. In addition, the Al2O3/SiO2 fiber membrane shows a significant chemical stability and super-wettability even after five annealing and surface modification cycles, indicating its excellent durability. The separation efficiency in both oil-removing mode and water-removing mode is over 95% for various oil/water mixtures through multiple recycle separation processes. This work not only provides a simple and cost-effective method to fabricate separation membrane with reversible wettability, but also shows great potential in remediation of large-scale oil spillage or organic solvents discharge at different environmental conditions.
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