An antifouling catechol/chitosan-modified polyvinylidene fluoride membrane for sustainable oil-in-water emulsions separation  

作　　者：Shanshan Zhao Zhu Tao Liwei Chen Muqiao Han Bin Zhao Xuelin Tian Liang Wang Fangang Meng 

机构地区：[1]School of Environmental Science and Engineering,Sun Yat-sen University,Guangzhou,510006,China [2]State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin,300387,China [3]Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology,Guangzhou,510006,China [4]School of Material Science and Engineering,Sun Yat-sen University,Guangzhou,510006,China

出　　处：《Frontiers of Environmental Science & Engineering》2021年第4期193-203,共11页环境科学与工程前沿（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.51808564 and 51878675);the State Key Laboratory of Separation Membranes and Membrane Processes(Tiangong University,Grant No.M1-201803);the National Key R&D Program of China(Grant No.2017YFE0114300).The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

摘　　要：Low-pressure membrane filtrations are considered as effective technologies for sustainable oil/water separation.However,conventional membranes usually suffer from severe pore clogging and surface fouling,and thus,novel membranes with superior wettability and antifouling features are urgently required.Herein,we report a facile green approach for the development of an underwater superoleophobic microfiltration membrane via one-step oxidant-induced ultrafast co-deposition of naturally available catechol/chitosan on a porous polyvinylidene fluoride(PVDF)substrate.Membrane morphology and surface chemistry were studied using a series of characterization techniques.The as-prepared membrane retained the original pore structure due to the ultrathin and uniform catechol/chitosan coating.It exhibited ultrahigh pure water permeability and robust chemical stability under harsh pH conditions.Moreover,the catechol/chitosan hydrophilic coating on the membrane surface acting as an energetic barrier for oil droplets could minimize oil adhesion on the surface,which endowed the membrane with remarkable antifouling property and reusability in a cyclic oil-in-water(O/W)emulsion separation.The modified membrane exhibited a competitive flux of~428 L/(m^(2)·h·bar)after three filtration cycles,which was 70%higher than that of the pristine PVDF membrane.These results suggest that the novel underwatersuperoleophobic membrane can potentially be used for sustainable O/W emulsions separation,and the proposed green facile modification approach can also be applied to other water-remediation materials considering its low cost and simplicity.

关 键 词：ANTIFOULING Catechol/chitosan co-deposition Oil-in-water emulsions separation Underwater superoleophobic 

分 类 号：O64[理学—物理化学]