【摘 要】
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For porous membranes, overcoming the trade-off between membrane flux and mechanical strength has always been a hot topic.In this study, a simple and practicable approach is explored to fabricate a sup
【出 处】
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海峡两岸第五届膜科学技术高级研讨会暨“青山杯”研究生论坛
论文部分内容阅读
For porous membranes, overcoming the trade-off between membrane flux and mechanical strength has always been a hot topic.In this study, a simple and practicable approach is explored to fabricate a super-strong free-standing polymer@CNT nanohybrid membrane through vacuum-assisted self-assembly process.Owing to the high hydrophilicity, abundant amino groups and hyperbranched structure, polyethyleneimine (PEI) is employed to modify CNTs surface to increase the hydrophilicity of CNTs and incorporate the multiple interactions between CNTs.Hence, the mechanical strength of PEI@CNT nanohybrid membrane including Youngs modulus and tension strength is remarkably elevated, which are about 100 and 10 folds of the conventional membranes fabricated through non-solvent induced phase separation process, respectively.Meanwhile, PEI endows PEI@CNT nanohybrid membrane with super-oleophobic properties and super-low adhesive force with oil underwater.The mechanical strength, pore size and the surface porosity are tuned by the mass ratio of PEI to CNT.And the thickness of membranes is tuned by the filtration volume of nPEI@CNT dispersions.The PEI@CNT nanohybrid membrane exhibits the water permeation flux reaching 9493 L m-2 h-1 bar-1 which can be used to separate surfactant-stabilized oil-in-water emulsions efficiently.
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