摘要
离子液体由于具有不易挥发、结构可调、对CO_2有良好的吸收性能等特点而成为当前CO_2分离领域的研究热点,但因高黏度和高成本问题而限制了其工业化应用。将离子液体与气体分离膜材料结合,得到的新型分离膜材料兼具离子液体和膜的优势,成为当前离子液体研究领域的趋势之一。针对这一热点问题,综述了离子液体支撑液膜、聚离子液体膜和离子液体共混/杂化膜在CO_2分离方面的研究现状和进展,讨论了离子液体结构和含量对膜分离性能、稳定性等的影响。相关研究表明,离子液体共混/杂化膜具有较高的分离性能和稳定性,是一种很有应用前景的CO_2分离材料。提出该领域的重点发展方向,即开发新的功能化离子液体共混/杂化膜材料是解决高渗透通量与高稳定性之间矛盾、强化CO_2分离性能的有效途径,深入研究离子液体共混/杂化膜的形成机制、气体在膜中的渗透行为以及CO_2分离机理。
Ionic liquids（ILs） have been widely used for CO_2 separation because of their unique properties, such as negligible vapor pressure, tunability for aimed application and high solubility for CO_2. However, the high viscosity and pricey cost of ILs limit their use in industrial applications. Thus, immobilization of ILs in membranes becomes one of the hot research spots in IL field due to the ILs based membranes possess both the advantages of ILs and membranes. This review summarizes the latest research on supported ionic liquid membranes, polymerized ionic liquid membranes and ionic liquid composite membranes for CO_2 separation. It is also discussed how the structures of ILs and ILs contents influence on the gas separation performances and stabilities of membranes. The research indicates that ILs composite membranes have high separation performance and stability, which is one of the prospective materials for CO_2 capture. The future research should highlight on the development of the novel fuctionalized ILs composite membranes and the trade-off of high CO_2 permeation rate and high stability to enhance the CO_2 separation performance. Besides, the study on the fabrication of composite membrane, gas transportation in membrane and CO_2 separation mechanism will inevitably attract considerable attentions.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2016年第1期248-257,共10页
CIESC Journal
基金
国家杰出青年科学基金项目(21425625)~~
关键词
离子液体
膜
二氧化碳
气体分离
ionic liquids
membranes
carbon dioxide
gas separation
