影响离子液体迁移的盐析和离子对效应
Effect of Salting-Out and Ion-Pairing on Column Transport of Ionic Liquids
摘要: 本文研究了五种阴离子不同的1-丁基-3-甲基咪唑基(Bmim+)离子液体在活性炭柱上的迁移行为，发现阴离子可通过与Bmim+的结合来改变离子液体的辛醇–水分配系数(Kow)和离子对结合常数(KIP)，从而影响离子液体的柱迁移能力。一般来说，Kow和KIP越大，离子液体吸附能力越强，迁移能力越弱。外加磷酸根(PO43-)阴离子，可使离子液体的迁移能力下降约60%，这得益于盐析效应的促进作用；而外加双三氟甲磺酰亚胺(NTf-2)阴离子，能促进强疏水[Bmim][NTf2]离子对的生成，使得离子液体的迁移能力下降约81%。
Abstract: In this work, the transport of five kinds of 1-n-Butyl-3-methylimidazolium (Bmim+) based ILs cou-pled with different counter anions in activated carbon column is studied. It is found that the counter anions can change the octanol-water partition coefficient (Kow) and the ion-pair formation constant (KIP) of ILs by binding with Bmim+ cation, thus affecting the column transport ability of ionic liquids. In general, the greater the Kow and KIP, the stronger the ILs adsorption and the weaker the ILs transport. The addition of PO43- anions decreases the transport of ILs by about 60%, which is due to the effect of salting out. Moreover, the addition of NTf-2 anions can promote the formation of stronger hydrophobic [Bmim][NTf2] ion pair, thereby decreasing ILs transport by approximately 81%.
文章引用：魏丽, 祝凌, 邱宇平. 影响离子液体迁移的盐析和离子对效应[J]. 水污染及处理, 2019, 7(2): 91-100. https://doi.org/10.12677/WPT.2019.72014

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