Department of Inorganic, Analytical Chemistry and Electrochemistry, Faculty of Chemistry, Silesian University of Technology, B. Krzywoustego 6, 44-100 Gliwice, Poland.
Bioeconomy and Eco-Innovation Centre, Łukasiewicz Research Network-The Institute for Sustainable Technologies, Pułaskiego 6/10, 26-600 Radom, Poland.
Int J Mol Sci. 2022 Jun 9;23(12):6472. doi: 10.3390/ijms23126472.
Ionic liquids (ILs), named also as liquid salts, are compounds that have unique properties and molecular architecture. ILs are used in various industries; however, due to their toxicity, the ILs' recovery from the postreaction solutions is also a very important issue. In this paper, the possibility of 1,3-dialkylimidazolium IL, especially the ,-dibutylimidazolium chloride ([CCIM]Cl) recovery by using the electrodialysis (ED) method was investigated. The influence of [CCIM]Cl concentration in diluate solution on the ED efficiency was determined. Moreover, the influence of IL on the ion-exchange membranes' morphology was examined. The recovery of [CCIM]Cl, the [CCIM]Cl flux across membranes, the [CCIM]Cl concentration degree, the energy consumption, and the current efficiency were determined. The results showed that the ED allows for the [CCIM]Cl recovery and concentration from dilute solutions. It was found that the [CCIM]Cl content in the concentrates after ED was above three times higher than in the initial diluate solutions. It was noted that the ED of solutions containing 5-20 g/L [CCIM]Cl allows for ILs recovery in the range of 73.77-92.45% with current efficiency from 68.66% to 92.99%. The [CCIM]Cl recovery depended upon the initial [CCIM]Cl concentration in the working solution. The highest [CCIM]Cl recovery (92.45%) and ED efficiency (92.99%) were obtained when the [CCIM]Cl content in the diluate solution was equal 20 g/L. Presented results proved that ED can be an interesting and effective method for the [CCIM]Cl recovery from the dilute aqueous solutions.
离子液体（ILs），也称为液体盐，是具有独特性质和分子结构的化合物。ILs 用于各种行业；然而，由于其毒性，从反应后溶液中回收 ILs 也是一个非常重要的问题。在本文中，研究了 1,3-二烷基咪唑鎓 IL，特别是 1,3-二丁基咪唑氯 ([CCIM]Cl) 通过电渗析 (ED) 方法回收的可能性。确定了稀释液中 [CCIM]Cl 浓度对 ED 效率的影响。此外，还研究了 IL 对离子交换膜形貌的影响。测定了 [CCIM]Cl 的回收率、[CCIM]Cl 穿过膜的通量、[CCIM]Cl 的浓度程度、能量消耗和电流效率。结果表明，ED 允许从稀溶液中回收和浓缩 [CCIM]Cl。发现 ED 后浓缩物中 [CCIM]Cl 的含量比初始稀释液中的含量高 3 倍以上。值得注意的是，当 ED 处理 5-20 g/L [CCIM]Cl 的溶液时，允许在 73.77-92.45%的范围内回收 ILs，电流效率为 68.66%-92.99%。[CCIM]Cl 的回收率取决于工作溶液中初始 [CCIM]Cl 浓度。当稀释液中 [CCIM]Cl 的含量等于 20 g/L 时，获得了最高的 [CCIM]Cl 回收率（92.45%）和 ED 效率（92.99%）。所提出的结果证明 ED 可以是从稀水溶液中回收 [CCIM]Cl 的一种有趣且有效的方法。
