Sorption of ionic liquids (ILs) to soil and porous materials as affected by anions was observed, but scarce effort has been focused on addressing the role of counteranions in sorption and the associated underlying mechanisms. In this work, two series of 1-butyl-3-methylimidazolium- (Bmim-) and N-butyl, methyl-benzimidazolium-based (Bmbim-based) ILs coupled with different counteranions were prepared to investigate the effect of anions on IL sorption by soot. The octanol–water partition coefficient (K_ow) and the ion-pair formation constant in water (K_IP^°) of ILs were independently measured to explore the contribution of counteranion-dependent hydrophobicity and ion-pair. A wide range of sorption coefficients (K_d) of ILs were achieved with values varying from 59.8 to 344.3 L kg^-1 for Bmbim-based ILs and from 253.4 to 489.7 L kg^-1 for Bmbim-based ILs. Compared with other anions, bis(trifluoromethanesulphonyl)imide ([Tf₂N]^–) and hexafluorophosphate ([PF₆]⁻) exhibit tighter association with IL cations in aqueous solution due to their larger K_ow and higher K_IP^°. Positive linear relationships between log K_IP^° and K_d and between log K_ow and K_d evidenced that the counteranion-dependent sorption of ILs relies on the association strengths of IL cations and counteranions, which further influence the hydrophobicity/hydrophilicity of ion pairs. Compared with that of strongly coordinating anions (such as [CF₃SO₃]⁻, [CF₃COO]⁻, [BF₄]⁻, [CF₃SO₃]⁻, and [Cl]⁻), the addition of weakly coordinating anions (such as [Tf₂N]^– and [PF₆]^–) in solution contributes to markedly large sorption enhancement of ILs. Consequently, the contribution of different counteranions on IL sorption is essentially based on the formation of ion pair with different K_IP^° and K_ow in aqueous solution.

观察到离子液体（ILs）受阴离子的影响而吸附到土壤和多孔材料上，但是很少有人致力于解决抗衡离子在吸附中的作用及其相关的潜在机理。在这项工作中，准备了两个系列的1-丁基-3-甲基咪唑鎓（Bmim-）和N-丁基，甲基-苯并咪唑鎓（Bmbim为主）的IL与不同的抗衡阴离子偶联，以研究阴离子对IL吸附的影响通过烟灰。对ILs的辛醇-水分配系数（K _ow）和离子在水中的离子对形成常数（K _IP ^°）进行独立测量，以探索抗衡离子依赖性疏水性和离子对的作用。广泛的吸附系数（对于基于Bmbim的IL，获得的IL的K _d值从59.8到344.3 L kg ^-1，对于基于Bmbim的IL，获得的IL值从253.4至489.7 L kg ^-1。与其他阴离子相比，双（三氟甲磺酰）亚胺（[TF ₂ N] ^{- ）}和六氟磷酸盐（[PF ₆ ] ^- ）在水溶液中由于其较大的表现出与IL阳离子紧密关联ķ_流量和更高的ķ _IP ^°。log K _IP ^°与K _d之间以及log K _ow与log之间的正线性关系K _d证明IL依赖于阴离子的吸附取决于IL阳离子和抗衡阴离子的缔合强度，这进一步影响了离子对的疏水性/亲水性。与强配位阴离子（例如[CF ₃ SO ₃ ] ^-，[CF ₃ COO] ^-，[BF ₄ ] ^-，[CF ₃ SO ₃ ] ^-和[Cl] ^-）相比，弱添加配位阴离子（例如[Tf ₂ N] ^–和[PF ₆ ] ^–溶液中的）有助于显着提高IL的吸附能力。因此，对IL吸附不同抗衡阴离子的贡献基本上是基于形成离子对具有不同ķ _IP ^°和ķ_流在水溶液中。