共价三嗪骨架分离膜的制备及有机溶剂渗透行为研究

发布时间：2018-06-16 12:01

本文选题：共价三嗪骨架 + 渗透汽化　；参考：《膜科学与技术》2017年01期

【摘要】：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.
[Abstract]:Covalent triazine skeleton covalent triazine frameworks are a class of porous quasicrystalline polymers connected by covalent bonds, which have potential applications in the fields of adsorption, catalysis, gas storage and high purity separation. In this study, CTF separation membranes were prepared by sol-gel method using 4 ~ (4) O -biphenyl dionitrile as monomer. The results of FTIR and ssNMRs show that the films have the characteristic triazine ring structure of CTFs. On this basis, the permeation behavior of different organic solvents through CTF separation membrane was studied, the pervaporation performance of the solvent and the effect of solvent on the swelling of the membrane were investigated. The results show that the permeability of straight chain alcohols in CTF separation membrane increases with the increase of the number of alcohols, but decreases with the increase of branched chains for isomeric low carbon alcohols. At the same time, the permeability of the components with higher octanol-water partition coefficient tends to increase. The permeation law of CTF membrane for organic solvent molecules indicates its application prospect in the field of organic solvent separation.
【作者单位】：中国科学院大连化学物理研究所催化基础国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金(21361130018,21276249)
【分类号】：TQ051.893

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