Though membrane distillation(MD)has gained more and more attention in the field of desalination,the wetting phenomenon was still a non-negligible problem.In this work,a method combined dip-coating and UV in situ polymerization for preparing hydrophobic/hydrophilic perfluoropolyether(PFPE)/polyvinylidene fluoride composite membranes.This composite membrane consisted of a top thin hydrophobic coating layer and hydrophilic substrate membrane.In terms of anti-wetting properties,con-tact angle and liquid entry pressure of all composite membranes(except for those based on 0.45 μm)exceeded 160° and 0.3 MPa,respectively.In particular,the desalination performance was tested in vac-uum membrane distillation tests by feeding 3.5％(mass)saline solution(NaCl)at 60℃.The composite membranes with larger support pore size and lower PFPE content had higher membrane distillation flux.And for stability tests(testing the 0.22 μm membrane coated by 5％(mass)PFPE),the highest MD flux 29.08 kg·m-2·h-1 and stable salt rejection(over 99.99％)during the period.Except that,the effects of coat-ing material concentration and pore sizes of substrate membrane were also investigated for surface mor-phology and topography,porosity,mechanical strength and pore size characteristics.This work provided a simple and effective alternative to prepare excellent hydrophobic composite membranes for MD applications.

Jun Pan;Xianli Xu;Zhaohui Wang;Shi-Peng Sun;Zhaoliang Cui;Lassaad Gzara;Iqbal Ahmed;Omar Bamaga;Mohammed Albeirutty;Enrico Drioli

State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemistry and Chemical Engineering,Nanjing Tech University,Nanjing 210009,China;National Engineering Research Center for Special Separation Membrane,Nanjing Tech University,Nanjing 210009,China;Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing Tech University,Nanjing 210009,China;Center of Excellence in Desalination Technology,King Abdulaziz University,Jeddah 21589,Saudi Arabia;Mechanical Engineering Department,King Abdulaziz University,Jeddah 21589,Saudi Arabia;Research Institute on Membrane Technology,ITM-CNR,Via Pietro Bucci 17/C,Rende 87036,Italy

中国化学工程学报（英文版）

[1]Jun Pan;Xianli Xu;Zhaohui Wang;Shi-Peng Sun;Zhaoliang Cui;Lassaad Gzara;Iqbal Ahmed;Omar Bamaga;Mohammed Albeirutty;Enrico Drioli-.Innovative hydrophobic/hydrophilic perfluoropolyether(PFPE)/polyvinylidene fluoride(PVDF)composite membrane for vacuum membrane distillation)[J].中国化学工程学报（英文版）,2022(05):248-257

perfluoropolyether

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