共价有机框架(COF)复合膜的制备及其脱盐性能研究  

Preparation of Covalent Organic Framework(COF)Composite Membranes for Desalination

作　　者：张显娟 张烨靖 刘雁飞[1] 逯鹏 李砚硕 ZHANG Xianjuan;ZHANG Yejing;LIU Yanfei;LU Peng;LI Yanshuo(Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学,浙江宁波315211

出　　处：《水处理技术》2024年第6期46-51,62,共7页Technology of Water Treatment

基　　金：宁波市重点研发计划(2022Z121)。

摘　　要：利用锂电池行业聚乙烯(PE)隔膜作为基底,采用聚乙烯醇(PVA)对其进行亲水化改性,得到亲水化PE膜。通过液-液界面聚合法制备离子型的共价有机框架(COF)材料,通过真空辅助自组装将其覆盖在亲水化PE膜表面,得到COF复合膜(COFMs)。系统研究了PE膜的表面属性对COFMs形貌、结构和脱盐性能的影响。结果表明:PE膜表面孔径和孔隙率的变化,有效影响了整体COFMs的脱盐性能。在0.5 MPa操作压力下,所制备的COFMs对四种无机盐的截留性能为:Na_(2)SO_(4)>MgSO_(4)>NaCl>MgCl_(2),且最优的COFM0.05表现出Na_(2)SO_(4)截留性能高达98.83%,水通量为4.35 L/(m^(2)·h)。在长期性能测试中,COFM_(0.05)的Na_(2)SO_(4)截留率保持稳定,表明PE支撑的COFMs具有优异的稳定性。Using polyethylene(PE)membrane from the lithium battery industry as the substrate,polyvinyl alcohol(PVA)was used to modify the PE membrane.Ionic covalent organic framework(COF)materials were prepared by liquid-liquid interfacial polymerization method and covered on the hydrophilic PE membranes surface by vacuum-assisted self-assembly to obtain COF composite membranes(COFMs).The effects of surface properties of PE membranes on the morphology,structure and desalination performance of COFMs were systematically studied.The results showed that the changes of pore size and porosity of the PE membrane surface effectively affected the desalination performance of COFMs.Under the operating pressure of 0.5 MPa,the rejections of the prepared COFMs for the four inorganic salts were as follows:Na_(2)SO_(4)>MgSO_(4)>NaCl>MgCl_(2).The optimal COFM_(0.05) showed the rejection of Na_(2)SO_(4) reached up to 98.83% and the water flux of 4.35 L/(m^(2)·h).In the long-term desalination test,the Na_(2)SO_(4) rejection rate of COFM0.05 remained stable,indicating that the PE-supported COFMs had excellent stability.

关 键 词：共价有机框架膜 聚乙烯支撑层 聚乙烯醇亲水化改性 脱盐 

分 类 号：TQ028.8[化学工程]