聚酰亚胺/UIO-66薄层纳米复合膜的制备及其纳滤性能  

Preparation of polyimide/UiO-66 thin film nanocomposite membrane and its nanofiltration performance

作　　者：代新雷 马文中[1,2] 钟璟 张新妙[3] 孟凡宁[3] DAI Xinlei;MA Wenzhong;ZHONG Jing;ZHANG Xinmiao;Meng Fanning(Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology,School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Key Laboratory of Environment-Friendly Polymer Materials,School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Environmental Protection Institute,Sinopec Beijing Research Institute of Chemical Industry,Beijing 100013,China)

机构地区：[1]常州大学石油化工学院,江苏省绿色催化材料与技术重点实验室,常州213164 [2]常州大学材料科学与工程学院,江苏省环境友好高分子材料重点实验室,常州213164 [3]中国石化北京化工研究院环境保护研究所,北京100013

出　　处：《膜科学与技术》2024年第2期89-96,106,共9页Membrane Science and Technology

基　　金：中国石油化工股份有限公司科技项目(219020-2);江苏省研究生科研与实践创新计划项目(KYCX22_3096)。

摘　　要：传统纳滤膜面临“trade-off”效应,不能够在保证截留的情况下提高膜通量.为解决这一问题,将UiO-66和UiO-66-NH 22种金属有机框架(MOFs)纳米材料分别引入水相和有机相,通过界面聚合反应,辅以亚胺化处理制备4种不同的聚酰亚胺(PI)复合纳滤(NF)膜,研究UiO-66的氨基化及不同添加方式对膜的结构及分离性能的影响.结果表明,与纯PI NF膜相比,4种PI复合NF膜具有更好的亲水性.UiO-66-NH 2添加水相具有最佳的纳滤性能,对CaSO_(4)的截留为91%,水通量为219 L/(m^(2)·h·MPa).4种PI复合NF膜在有机溶剂(THF、DMAc、MT、NMP)中浸泡48 h后,其通量衰减<0.1%,CaSO_(4)的截留率变化<1%;在120 h的长期运行中,通量衰减量在9~17 L/(m^(2)·h·MPa)之间,具有较好的稳定性.Traditional nanofiltration membranes still experience a“trade-off”phenomenon,where they cannot enhance membrane flux without compromising rejection.To solve this problem,Introduce two metal-organic frameworks(MOFs),UiO-66 and UiO-66-NH 2,as nanomaterials into aqueous and organic phases,respectively.Four different polyimide(PI)composite nanofiltration(NF)membranes were prepared by interfacial polymerization reaction and imidization treatment.to study the effects of UiO-66 amination and the influence of different adding methods on membrane structure and separation performance.The water contact results showed that the four PI composite NF membranes had better hydrophilic properties compared to pure PI NF membranes.The nanofiltration performance showed that the UiO-66-NH 2-doped aqueous phase had the best nanofiltration performance with 91%CaSO_(4)rejection and 219 L/(m^(2)·h·MPa)water flux.The fluxes of the four PI composite NF membranes were attenuated by less than 0.1%after soaking in organic solvents(THF,DMAc,MT,NMP)for 48 h.CaSO_(4)rejection did not change much(attenuation<1%);flux attenuation ranged from 9-17 L/(m^(2)·h·MPa)during 120 h of long-term operation,indicating good stability.

关 键 词：UiO-66 水相添加 有机相添加 聚酰亚胺 

分 类 号：TQ028.8[化学工程]