共价三嗪骨架(Covalent Triazine Frameworks,CTFs)材料是一类以共价键连接的多孔准晶型聚合物,在吸附、催化、气体储存和高纯分离领域具有潜在的应用价值.在本项研究中,以4,4'-联苯二甲腈为单体,采用溶胶-凝胶法制备CTF分离膜.经红外光谱(FTIR)和固体核磁(ssNMR)表征证实,所制备的膜具有CTFs材料的特征三嗪环结构.在此基础上,开展了不同有机溶剂通过CTF分离膜的渗透行为研究,考察了溶剂的渗透汽化性能,以及溶剂对分离膜溶胀的作用规律.结果显示,CTF分离膜对于直链醇类的渗透率随醇类碳数的增加而上升;而对于同分异构低碳醇的渗透率,则随支链增加而降低.同时,正辛醇-水分配系数越大的组分,其渗透率往往越大.CTF分离膜对于有机溶剂分子的渗透规律预示了它在有机溶剂分离领域的应用前景.
Covalent Triazine Frameworks (CTFs) are a new type of porous semi-crystalline polymers,which are constructed with organic building units via covalent bonds,displaying potential applications in adsorption,catalysis,gas storage and high efficient separation.In this research,CTF membranes were prepared from 4,4'-biphenyldicarbonitrile via a sol-gel route.The successful formation of triazine rings in the as-synthesized CTF membranes were proved by Fourier Transform infrared spectroscopy (FTIR) and Solid-state 13 C Nuclear Magnetic Resonance (ssNMR).Based on above results,the permeation behavior of different organic solvent through the CTF membranes were systematically investigated.The permeability of mono alcohols through the CTF membranes increases with the carbon numbers of the alcohols and decreases with the increasing numbers of branch chain of the alcohols.In addition,it is found that the permeability of organic solvent increases with its octanol-water partition coefficient (Kow).This work demonstrates the potential applications of CTF membranes for organic solvent separation.
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