Selective separation of oil-in-water emulsion with high efficiency by bio-inspired Janus membrane  

作　　者：CAI YaHui CHEN DongYun LI NaJun XU QingFeng LI Hua HE JingHui LU JianMei 

机构地区：[1]College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123,China [2]Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China

出　　处：《Science China(Technological Sciences)》2021年第10期2211-2219,共9页中国科学（技术科学英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2020YFC1808401);the National Natural Science Foundation of China(Grant Nos.22078213,21938006,51973148,21776190);the Cutting-edge Technology Basic Research Project of Jiangsu(Grant No.BK20202012);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).

摘　　要：The efficient and rapid separation of oil from stabilized oil-in-water emulsions with micro/nanometer size is a global challenge.Owing to the low oil content in oil-in-water emulsions,separating the oil by simply controlling the surface wettability is difficult.Controlling the pore size of the membrane surface to achieve separation will lead to a sharp decrease in flux.Herein,inspired by cell membrane transportation,a hydrophilic/hydrophobic bifunctional Janus membrane for stable oil-in-water separation was prepared by simple surface polymerization and vapor diffusion.The prepared Janus membrane contained a hydrophobic side and hydrophilic polyamine layer.When used for oil-in-water emulsion separation,the polyamine layer accumulated micro/nanometer oil droplets,forming an oil layer on the hydrophobic surface.Water was retained by the 1H,1H,2H,2H-perfluorooctyl trichlorosilane layer,allowing oil droplets to selectively permeate through the membrane,achieving the separation effect.As the pore size of the modified fabric was basically unchanged,the permeation flux was fast(1.53×10^(3) Lm^(−2) h^(−1)).Furthermore,the poly(N,N-dimethylaminoethyl methacrylate)layer destroyed the emulsion stability,making the emulsion droplets aggregate without affecting the separation efficiency with fast permeation flux.Therefore,the prepared bifunctional Janus membrane shows great potential for actual wastewater treatment.

关 键 词：bifunctional Janus membrane demulsification function oil-in-water emulsion separation superhydrophobicity/superoleophilicity surface chemistry 

分 类 号：TB383.2[一般工业技术—材料科学与工程]