改性GO芳香族聚酰胺复合纳滤膜制备及分离性能  

Preparation of Graphene Oxide-doped Aromatic Polyamide Composite Nanofiltration Membrane and Its Separation Performance

作　　者：胡文博 陈卫[1,2] 丁明梅 陈杰 王安琪 蓝晓萌 HU Wen-bo;CHEN Wei;DING Ming-mei;CHEN Jie;WANG An-qi;LAN Xiao-meng(Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Hohai University,Nanjing 210098,China;College of Environment,Hohai University,Nanjing 210098,China;Jiangsu Nollet Intelligent Water Equipment Co.Ltd.,Nantong 226000,China)

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [2]河海大学环境学院,江苏南京210098 [3]江苏诺莱智慧水务装备有限公司,江苏南通226000

出　　处：《中国给水排水》2023年第9期57-64,共8页China Water & Wastewater

基　　金：国家自然科学基金青年科学基金资助项目(522029211)。

摘　　要：为提高纳滤膜分离特性、拓展其在水处理中的适用性,以聚砜(PSf)为膜基材,以由4,4'-二氨基二苯醚(4,4'-ODA)改性的聚对苯二甲酰对苯二胺(m-PPTA)和氧化石墨烯(GO)为共混材料,采用相转化法制得基膜后,再通过界面聚合法制备改性氧化石墨烯芳香族聚酰胺复合纳滤膜(m-PPTA/PSf-GO),研究改性材料占比对膜表面形貌、内部结构及其分离性能的影响。结果表明:当m-PPTA占比为6%并均匀分布时,膜表面出现明显凸起,有助于支撑层与聚酰胺层紧密结合;引入GO可使膜亲水性增强、内部海绵状空隙增多,有利于水分子的转移;当GO占比为0.005%时,m-PPTA/PSf-GO对分别含MgSO_(4)、Na_(2)SO_(4)水样的水通量和截留率最佳,依次为68.7、71.0 L(/m^(2)·h·MPa)和91.3%、94.8%。该共混改性方法简便,m-PPTA和GO的引入可有效提高复合纳滤膜的分离性能。To improve the separation characteristics of nanofiltration membrane and expand its applicability in water treatment,the modified graphene oxide-doped aromatic polyamide composite nanofiltration membrane(m-PPTA/PSf-GO)was prepared by interfacial polymerization method after the basement membrane was prepared by phase conversion method.In the preparation process,polysulfone(PSf)was used as the membrane substrate,and graphene oxide(GO)and polyterephthaloyl p-phenylenediamine modified by 4,4'-diaminodiphenyl ether(4,4'-ODA)were used as the blending materials.Then,the effects of the proportion of modified materials on the surface morphology,internal structure and separation performance of the membrane were investigated.When the proportion of the modified polyterephthaloyl p-phenylenediamine(m-PPTA)was 6% and distributed uniformly,the surface of the membrane protruded obviously,which was conducive to the supporting layer to bond closely with the polyamide layer.The introduction of GO enhanced the membrane hydrophilicity and increased the internal spongy void,which was conducive to the transfer of water molecules.When the proportion of GO was 0.005%,m-PPTA/PSf-GO had the best water flux and retention rates in filtration of MgSO_(4) and Na_(2)SO_(4) water samples.The water flux was 68.7 L/(m^(2)·h·MPa)and 71.0 L/(m^(2)·h·MPa),and the retention rates were 91.3% and 94.8%,respectively.The blending modification method was simple,and the introduction of m-PPTA and GO effectively improved the separation performance of the composite nanofiltration membrane.

关 键 词：复合纳滤膜 改性芳香族聚酰胺 氧化石墨烯(GO) 相转化法 界面聚合 

分 类 号：TU992[建筑科学—市政工程]