Superwetting membranes have emerged as promising materials for the efficient treatment of oily wastewater.Typically,superwetting membranes can be developed by ingeniously chemical modification and topographical structuration of microporous membranes.Herein,we report the hierarchical assem-bly of metal-phenolic-polyplex coating to manipulate membrane surface superwettability by integrating metal-phenolic(FeⅢ-tannic acid(TA))assembly with polyplex(tannic acid-polyethylenimine(PEI))as-sembly.The proposed Fe-TA-PEI coating can be deposited on microporous membrane via simply dipping into FeⅢ-TA-PEI co-assembly solution.Based on the catechol chemistry,the coordination complexation of FeⅢ and TA develops metal-phenolic networks to provide hydrophilic chemistries,and the electrostatic complexation of TA and PEI generates nanoconjugates to impart hierarchical architectures.Benefiting from the synergy of hydrophilic chemistries and hierarchical architectures,the resulting PVDF/Fe-TA-PEI membrane exhibits excellent superhydrophilicity(～0°),underwater superoleophobicity(～150°)and supe-rior anti-oil-adhesion capability.The superhydrophilicity of PVDF/Fe-TA-PEI membrane greatly promotes membrane permeability,featuring water fluxes up to 5860 L m-2 h-1.The underwater superoleophobicity of PVDF/Fe-TA-PEI membrane promises potential flux(3393 L m-2 h-1),high separation efficiency(99.3％)and desirable antifouling capability for oil-in-water emulsion separation.Thus,we highlight the reported hierarchical metal-phenolic-polyplex assembly as a straightforward and effective strategy that enables the synchronous modulation of surface chemistry and topography toward superwetting membranes for promising high-flux and antifouling oil-water separation.

Xueting Zhao;Yuanyuan Jiang;Lijuan Cheng;Youyou Lan;Tingyuan Wang;Jiefeng Pan;Lifen Liu

College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China

中国化学快报（英文版）

[1]Xueting Zhao;Yuanyuan Jiang;Lijuan Cheng;Youyou Lan;Tingyuan Wang;Jiefeng Pan;Lifen Liu-.Hierarchical metal-phenolic-polyplex assembly toward superwetting membrane for high-flux and antifouling oil-water separation)[J].中国化学快报（英文版）,2022(08):3859-3864

Superwetting,structuration,superwettability,nanoconjugates,superoleophobicity

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