Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007 (P. R. China).
Beijing Key Laboratory of Ionic Liquids Clean Process, Chinese Academy of Sciences, Beijing (P. R. China).
Angew Chem Int Ed Engl. 2015 Jun 15;54(25):7265-9. doi: 10.1002/anie.201500695. Epub 2015 Apr 29.
Ionic liquids (ILs) with a reversible hydrophobic-hydrophilic transition were developed, and they exhibited unique phase behavior with H2O: monophase in the presence of CO2, but biphase upon removal of CO2 at room temperature and atmospheric pressure. Thus, coupling of reaction, separation, and recovery steps in sustainable chemical processes could be realized by a reversible liquid-liquid phase transition of such IL-H2O mixtures. Spectroscopic investigations and DFT calculations showed that the mechanism behind hydrophobic-hydrophilic transition involved reversible reaction of CO2 with anion of the ILs and formation of hydrophilic ammonium salts. These unique IL-H2O systems were successfully utilized for facile one-step synthesis of Au porous films by bubbling CO2 under ambient conditions. The Au porous films and the ILs were then separated simultaneously from aqueous solutions by bubbling N2, and recovered ILs could be directly reused in the next process.
开发了具有可逆疏-亲水性转变的离子液体（ILs），它们在存在 CO2 的情况下表现出独特的相行为：单相，但在室温常压下除去 CO2 时则为两相。因此，通过这种 IL-H2O 混合物的可逆液-液相转变，可以实现可持续化学过程中反应、分离和回收步骤的耦合。光谱研究和 DFT 计算表明，疏-亲水性转变背后的机制涉及 CO2 与 ILs 的阴离子的可逆反应以及亲水性铵盐的形成。这些独特的 IL-H2O 体系成功地用于在环境条件下通过鼓泡 CO2 来简便地一步合成 Au 多孔膜。然后通过鼓泡 N2 将 Au 多孔膜和 ILs 从水溶液中同时分离出来，并且可以直接将回收的 ILs 再用于下一个过程。
