碳纳米管基电子-离子双传递功能复合膜的构筑及电驱动离子分离性能  

Construction of Carbon Nanotube-based Composite Membrane with Electron-ion Double Transfer Function and its Electrically Driven Ion Separation Performance

作　　者：武晓岗 王洁 张良 高凤凤 罗善霞 杜晓 郝晓刚[1] WU Xiaogang;WANG Jie;ZHANG Liang;GAO Fengfeng;LUO Shanxia;DU Xiao;HAO Xiaogang(College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China;Hebei Institute of Regional Geological Survey,Shijiazhuang 050051,China)

机构地区：[1]太原理工大学化学工程与技术学院,太原030024 [2]河北省区域地质调查院,石家庄050051

出　　处：《太原理工大学学报》2023年第1期17-23,共7页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(22078217,U21A20303);河北省地矿局科研项目(13000022P00329410110T)。

摘　　要：构筑具有电子、离子传递的双功能电活性离子分离膜是电控离子选择渗透膜(ESIPM)分离领域的关键技术。通过将导电碳纳米管(CNT)和纤维素纳米纤维(CNF)共混抽滤,制备了在亚微米尺度具有三维多孔结构的CNT/CNF复合膜,以此为导电基膜,通过溶液渗透策略,在不破坏CNT交联网络结构的前提下,将具有阳离子交换功能的磺化聚苯乙烯(SPS)原位填充到CNT/CNF的亚微米孔道中,制备了具有电子、离子双重传递功能的SPS/CNT/CNF复合膜。采用SEM、XRD、FTIR、接触角测试仪对其结构和性能进行了表征,并结合电驱动膜分离测试装置,对CNT/CNF膜和SPS/CNT/CNF膜的离子分离性能进行了系统对比。结果表明,SPS/CNT/CNF复合膜具有等效商业化离子交换膜的阳离子分离能力,而且具备优良的导电性,其导电性能相较于传统的惰性离子交换膜提升了7个数量级。此外,该SPS/CNT/CNF复合膜还具备优良的电化学活性、亲水性以及稳定性,本研究为制备高性能ESIPM提供了新型的合成策略。The construction of electroactive ion separation membranes with dual functions of electron and ion transfer is a key technology in the field of electronchemically switched ion permselectivity membrane(ESIPM) separation. In this paper, CNT/CNF composite membranes with three-dimensional porous structure in submicron scale were prepared by blending and filtration of conducting carbon nanotubes(CNT) and cellulose nanofibers(CNF). Using CNT/CNF composite membranes as conductive base membrane, the SPS/CNT/CNF composite membrane with dual electron and ion transfer function was prepared by in situ filling of sulfonated polystyrene(SPS) with cation exchange function into the nano-micron channel of CNT/CNF without destroying the structure of CNT crosslinking network through solution penetration strategy. The structure and properties of CNT/CNF membrane were characterized by SEM, XRD, FTIR, and contact angle test. The ion separation performance of CNT/CNF membrane and SPS/CNT/CNF membrane was systematically compared on an electrodrive membrane separation tester. The results show that the SPS/CNT/CNF composite membrane has the cation separation ability equivalent to commercial ion exchange membrane, and has excellent electrical conductivity with an electrical conductivity 7 orders of magnitude higher than that of traditional inert ion exchange membrane. In addition, the SPS/CNT/CNF composite membrane also has excellent electrochemical activity, hydrophilicity, and stability. This study provides a novel synthesis strategy for the preparation of high performance ESIPM.

关 键 词：碳纳米管 磺化聚苯乙烯 纤维素纳米纤维 电控离子选择性渗透 导电性 

分 类 号：TQ150.9[化学工程—电化学工业]