Superhydrophilic nanoporous membrane for highly efficient and stable separation of organic molecules
Fabricating nanoporous membranes with su-perhydrophilic properties to overcome fouling from organic foulants is a challenge in membrane separation processes for organic molecules.Recently,researchers demonstrated that membranes with distinct hydrogel features exhibit super-hydrophilicity and outstanding antifouling capacity.However,hydrogel membranes have low mechanical strength,which can lead to pore deformation and potential membrane rupture during pressure-driven separation processes.Herein,we re-port a whole-membrane crosslinking strategy to fabricate a superhydrophilic and robust nanoporous membrane in which polyethyleneimine is blended and crosslinked in a carboxy-lated polyacrylonitrile hydrogel membrane in situ.Whole-membrane crosslinking improves membrane strength,with crosslinking occurring both in the membrane interior and on the membrane surface.Efficient molecular separation with a water flux of 220 L m-2 h-1 bar-1,a Coomassie brilliant blue(CBB)rejection of～99.9％,and a CBB/Na2SO4 selectivity of 747 was achieved with this membrane.The membrane also showed excellent antifouling capacity,with a flux recovery of～100％during molecular separation with humic acid as a foulant.At transmembrane pressures up to 8 bar,the mem-brane exhibited stable molecular separation.Our work pro-vides a new route for fabricating superhydrophilic nanoporous membranes for the separation of organic mole-cules in wastewater.
College of Chemistry,Chemical Engineering and Materials Science,Collaborative Innovation Center of Suzhou Nano Science and Technology,Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis,Jiangsu Key Laboratory of Advanced Negative Carbon Technologies,Soochow University,Suzhou 215123,China
i-Lab,CAS Key Laboratory of Nano-Bio Interface,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,China
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