摘要
二维共价三嗪框架材料(2D-CTF)可作为一类理想的二维分离膜基元体。本文利用微界面法制备了具有寡层结构的2D-CTF-1纳米材料,并以其为基元体构筑超薄层状2D-CTF-1分离膜。采用傅里叶红外光谱、X射线光电子能谱、原子力显微镜、透射电子显微镜和扫描电子显微镜对2D-CTF-1纳米材料及其组装成的分离膜进行结构与形貌表征,并测试2D-CTF-1分离膜在不同压力下的纯水通量以及对染料小分子的分离性能。结果表明:2D-CTF-1分离膜的纯水通量可达153.7 L/(m^2·h)(25℃,0.1 MPa),二维面内结构孔为主要的水分子传输通道,对染料小分子刚果红的渗透通量为132.5 L/(m^2·h)(25℃,0.1 MPa),截留率为98.3%。2D-CTF-1分离膜在长时间连续运行后仍能维持较高通量和96%以上的截留率,是一类极具潜力的新型二维分离膜材料。
Two-dimensional covalent triazine framework material(2 D-CTF) is a kind of covalent organic framework material with triazine ring structure consisting of C and N elements, which is considered to be a type of ideal membrane material due to its excellent structural stability and adjustable in-plane nanopore. In this study, few-layers 2 D-CTF-1 nanomaterials were prepared using a micro-interface method based on the polymerization of 1,4-dicyanobenzene. The resulting few-layers 2 D-CTF-1 nanosheets were used as building blocks to construct 2 D-CTF-1 membrane via a layer-bylayer assembly method. The structure and morphology of the prepared 2 D-CTF-1 nanosheets and membrane were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy,transmission electron microscopy and scanning electron microscopy. The pure water flux under different pressures and the separation performances of 2 D-CTF-1 membrane for small organic dye molecules were tested. The results show that 2 DCTF-1 membrane possesses high pure water flux(153.7 L/(m^2·h))(25 ℃, 0.1 MPa), and the in-plane nanopores of 2 D-CTF-1 are proposed as the main transport channels for water molecules. Besides, the 2 D-CTF-1 membrane exhibits high flux(132.5 L/(m^2·h))(25 ℃, 0.1 MPa) and high rejection rate(98.3%) for separation of organic dye(Congo red). The membrane still shows high flux and rejection after a long-term operation. Thus, 2 D-CTF-1 is a promising 2 D separation membrane material for high efficient molecular separation.
作者
李贵亮
方齐乐
刘富
LI Guiliang;FANG Qile;LIU Fu(Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China;University of Chinese Academy of Sciences, Beijing 100049, China)
出处
《功能高分子学报》
CAS
CSCD
北大核心
2019年第5期610-616,共7页
Journal of Functional Polymers
基金
国家自然科学基金(51603209,5161101025)
宁波市创新团队(2014B81004)
宁波市科技局(2016C10048,2016C10010,2017C510005)
关键词
二维材料
共价三嗪
分离膜
高通量
微界面法
two-dimensional material
covalent triazine
separation membrane
high flux
micro-interface method
