Innovative hydrophobic/hydrophilic perfluoropolyether(PFPE)/polyvinylidene fluoride(PVDF)composite membrane for vacuum membrane distillation  

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

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemistry and Chemical Engineering,Nanjing Tech University,Nanjing 210009,China [2]National Engineering Research Center for Special Separation Membrane,Nanjing Tech University,Nanjing 210009,China [3]Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing Tech University,Nanjing 210009,China [4]Center of Excellence in Desalination Technology,King Abdulaziz University,Jeddah 21589,Saudi Arabia [5]Mechanical Engineering Department,King Abdulaziz University,Jeddah 21589,Saudi Arabia [6]Research Institute on Membrane Technology,ITM-CNR,Via Pietro Bucci 17/C,Rende 87036,Italy

出　　处：《Chinese Journal of Chemical Engineering》2022年第5期248-257,共10页中国化学工程学报（英文版）

基　　金：financial support of the National Key Research&Development Program of China(2017YFC0403702);the National Natural Science Foundation of China(51861135203);the Jiangsu Provincial Department of Human Resources and Social Security(JNHB-036);the Materials-Oriented Chemical Engineering State Key Laboratory Program(KL19-04);Deputyship for Research and Innovation,Ministry of Education in Saudi Arabia for funding this research work through the project number(632)。

摘　　要：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,contact angle and liquid entry pressure of all composite membranes(except for those based on 0.45μm)exceeded 160°and 0.3 MPa,respectively.In particular,the desalination performance was tested in vacuum 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 0.22μm membrane coated by 5%(mass)PFPE),the highest MD flux29.08 kg·m^(-2)·h^(-1) and stable salt rejection(over 99.99%)during the period.Except that,the effects of coating material concentration and pore sizes of substrate membrane were also investigated for surface morphology 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.

关 键 词：DESALINATION Membrane surface coating Composite membranes Anti-wetting Vacuum membrane distillation 

分 类 号：TQ051.893[化学工程] P747[天文地球—海洋科学]