层层自组装氧化石墨烯纳滤膜的制备及表征  

Preparation and Characterization of Layer-by-layer Self-assembly Graphene Oxide Nanofiltration Membranes

作　　者：周易 彭雅娟[1] 邵文尧[1] ZHOU Yi;PENG Yajuan;SHAO Wenyao(College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学化学化工学院,福建厦门361005

出　　处：《化工技术与开发》2023年第9期1-6,44,共7页Technology & Development of Chemical Industry

基　　金：厦门市科技计划项目(3502Z20183016)。

摘　　要：层层自组装法是一种新型的纳滤膜制备方法。本文采用层层自组装法制备了氧化石墨烯(GO)纳滤膜,以聚乙烯亚胺(PEI)为聚电解质,考察了不同的GO浓度对纳滤膜的结构及性能的影响,确定了最优GO浓度,并在最优的GO浓度下改变聚电解质种类,研究了其对膜的结构及性能的影响。结果表明,随着GO浓度增加,膜性能显著提升。当GO浓度为0.200mg·mL^(-1)时,膜对伊文思蓝的截留率达到95.4%,为最优GO浓度。在最优GO浓度下,将聚电解质PEI改为聚乙烯亚胺(HPEI),或添加交联剂乙二胺(EDA),纳滤膜的膜通量及截留率均有明显变化,其中聚电解质为HPEI的膜,水通量为135L·m^(-2)·h^(-1)·MPa^(-1),对伊文思蓝的截留率近100%,为性能最优的GO复合纳滤膜。Layer-by-layer self-assembly was a new method for the preparation of composite nanofiltration membrane.In this study,graphene oxide nanofiltration membranes were prepared by layer-by-layer self-assembly method.Applied polyethyleneimine as polyelectrolyte,the effect of GO concentration on the structure and properties of the nanofiltration membrane were systematically investigated,therefore the optimal GO concentration was determined.Then the polyelectrolyte was changed at the optimal GO concentration to study the effect.The results showed that with the increase of GO concentration,the water flux gradually decreased,the flux to Evans Blue gradually fell and the rejection increased significantly.When the GO concentration was 0.200 mg/mL,the Evans blue rejection was 95.4%.Under the optimal GO concentration,polyelectrolyte PEI was changed to polyethyleneimine or crosslinking agent ethylenediamine,the membrane flux and rejection had significant changes.The water flux of membrane prepared with HPEI was 135L/m^(2)/h/MPa,and the Evans blue rejection was nearly 100%,which was the best performance of the GO composite nanofiltration membrane in this experiment.

关 键 词：纳滤膜 层层自组装 氧化石墨烯 膜分离 

分 类 号：TQ051.893[化学工程]