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(K
ow)和离子对结合常数(K
IP),从而影响离子液体的柱迁移能力。一般来说,K
ow和K
IP越大,离子液体吸附能力越强,迁移能力越弱。外加磷酸根(PO
43-)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][NTf
2]离子对的生成,使得离子液体的迁移能力下降约81%。
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 (K
ow) and the ion-pair formation constant (K
IP) of ILs by binding with Bmim
+ cation, thus affecting the column transport ability of ionic liquids. In general, the greater the K
ow and K
IP, the stronger the ILs adsorption and the weaker the ILs transport. The addition of
PO
43- 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][NTf
2] ion pair, thereby decreasing ILs transport by approximately 81%.
离子液体,柱迁移,盐析效应,离子对效应, Ionic Liquids Column Transport Effect of Salting-Out Effect of Ion-Pairing影响离子液体迁移的盐析和离子对效应
魏丽*,祝凌,邱宇平
同济大学环境科学与工程学院,上海
收稿日期:2019年4月7日;录用日期:2019年4月18日;发布日期:2019年4月26日
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( P O 4 3 − )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( N T f 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%。
魏 丽,祝 凌,邱宇平. 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[J]. 水污染及处理, 2019, 07(02): 91-100. https://doi.org/10.12677/WPT.2019.72014
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