Antifouling graphene oxide membranes for oil-water separation via hydrophobic chain engineering

Chao Yang, Mengying Long, Cuiting Ding, Runnan Zhang, Shiyu Zhang, Jinqiu Yuan, Keda Zhi, Zhuoyu Yin, Yu Zheng, Yawei Liu (), Hong Wu () and Zhongyi Jiang ()
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Chao Yang: Tianjin University
Mengying Long: Tianjin University
Cuiting Ding: Tianjin University
Runnan Zhang: Tianjin University
Shiyu Zhang: Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City
Jinqiu Yuan: Tianjin University
Keda Zhi: Tianjin University
Zhuoyu Yin: Tianjin University
Yu Zheng: Tianjin University
Yawei Liu: Chinese Academy of Sciences
Hong Wu: Tianjin University
Zhongyi Jiang: Tianjin University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Engineering surface chemistry to precisely control interfacial interactions is crucial for fabricating superior antifouling coatings and separation membranes. Here, we present a hydrophobic chain engineering strategy to regulate membrane surface at a molecular scale. Hydrophilic phytic acid and hydrophobic perfluorocarboxylic acids are sequentially assembled on a graphene oxide membrane to form an amphiphilic surface. The surface energy is reduced by the introduction of the perfluoroalkyl chains while the surface hydration can be tuned by changing the hydrophobic chain length, thus synergistically optimizing both fouling-resistance and fouling-release properties. It is found that the surface hydration capacity changes nonlinearly as the perfluoroalkyl chain length increases from C4 to C10, reaching the highest at C6 as a result of the more uniform water orientation as demonstrated by molecular dynamics simulations. The as-prepared membrane exhibits superior antifouling efficacy (flux decline ratio

Date: 2022
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DOI: 10.1038/s41467-022-35105-8

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