MOF-199@GO改性PVDF荷电纳滤膜的制备及其性能  

Preparation and properties of MOF-199@GO modified PVDF charged composite nanofiltration membrane

作　　者：奥德 张皓冰 吕美婵 王海涛[1,2] 常娜[1,3] AO De;ZHANG Haobing;LYU Meichan;WANG Haitao;CHANG Na(State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China;School of Environmental Science and Engineering,Tiangong University,Tianjin 300387,China;School of Chemistry and Chemical Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学省部共建分离膜与膜过程国家重点实验室,天津300387 [2]天津工业大学环境科学与工程学院,天津300387 [3]天津工业大学化学与化工学院,天津300387

出　　处：《化工学报》2020年第S02期297-305,共9页CIESC Journal

基　　金：天津市科技重大专项项目(17ZXHJSF00040,18ZXSZSF00010,19YFSLQY00060,19PTZWHZ00030);中国博士后基金项目(2018M630275)。

摘　　要：采用原位生长法制备了MOF-199@氧化石墨烯(GO)纳米复合材料,并对聚偏氟乙烯(PVDF)支撑膜进行表面改性,以克服PVDF膜表面疏水性。通过界面聚合反应,制备了基于MOF-199@GO改性PVDF的聚酰胺复合荷电纳滤膜。采用XRD、SEM、TEM、AFM和zeta电位等手段表征了MOF-199@GO复合材料及MOF-199@GO改性PVDF聚酰胺复合纳滤膜的结构及微观形貌,并测试了MOF-199@GO改性PVDF聚酰胺复合纳滤膜的脱盐性能。结果表明:通过MOF-199@GO复合材料对PVDF支撑膜的表面改性,有效克服了PVDF支撑膜的疏水性,实现了表面聚酰胺薄层的均匀连续生长,荷电纳滤膜表面荷负电性能显著增强,其中经MOF-199@GO充分改性的复合荷电纳滤膜表现出优异的脱盐性能,对MgSO4、Na2SO4、NaCl和MgCl2四种盐的截留率分别达到了93.56%、93.04%、87.48%和87.11%。As novel functional materials,metal-organic framework(MOF)and graphene oxide(GO)have received great attentions in recent years.In this work,MOF@GO nanocomposite(MOF-199@GO)is prepared by an in-situ growth method.A novel and highly efficient nanofiltration(NF)membrane can be facilely fabricated via surface decoration of MOF-199@GO onto poly(vinylidene fluoride)(PVDF)substrate before interfacial polymerization of mphenylenediamine(MPD)and trimesoyl chloride(TMC)in order to overcome the hydrophobicity of PVDF membrane.The structure and morphology of MOF-199@GO and MOF-199@GO modified PVDF polyamide composite membrane are characterized by XRD,SEM,TEM,AFM and zeta potential.MOF-199@GO modified PVDF composite NF membrane which possesses dense and uniform polyamide thin-layer exhibits higher negative surface potential(up to^37 mV)at pH 9.5.The performance of MOF-199@GO modified PVDF polyamide composite NF membrane has been investigated by determination of pure water flux and salt rejection.The prepared NF membrane MG3 exhibited highly efficient rejection of MgSO4,Na2SO4,NaCl and MgCl2,which are 93.56%,93.04%,87.48%and 87.11%,respectively.This work provides a worthy reference for designing highly efficient NF membranes modified by MOF and relevant materials.

关 键 词：MOF-199 氧化石墨烯 聚偏氟乙烯 膜 复合材料 脱盐 

分 类 号：TQ028.8[化学工程]