Studzińska Sylwia, Sprynskyy Myroslav, Buszewski Bogusław
Chair of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, 7 Gagarin Street, PL-87-100 Toruń, Poland.
Chemosphere. 2008 May;71(11):2121-8. doi: 10.1016/j.chemosphere.2008.01.013. Epub 2008 Mar 7.
In the present contribution sorption kinetics experiments under static conditions were utilized in three selected ionic liquids cations (1-ethyl-3-methylimidazolium, 1-butyl-3-methylimidazolium, 1-hexyl-3-methylimidazolium chlorides) study with five type of soil, differing in total organic carbon (TOC) content. The experimental results indicate the sorption capacity growth with increase in TOC content and hydrophobicity of ionic liquid cation. The obtained kinetic sorption parameters as well as distribution coefficients (K(d)) were used to estimate the sorption properties of the soil types towards the ionic liquids in question. The Gibbs free energy values indicate that ionic liquid cations sorption on soils could be generally considered as a physical adsorption with exothermic effect. But the values of -dG for studied cations sorption on soil with very high of TOC content in soil (45%) may testify to nature of chemical adsorption. Sorption of the analyzed compounds occurs probably by means of hydrogen bonds, electrostatic and pi three dots pi interaction with the organic matter and the clay minerals of the soils.
在本研究中，利用静态条件下的吸附动力学实验，对三种选定的离子液体阳离子（1-乙基-3-甲基咪唑鎓、1-丁基-3-甲基咪唑鎓、1-己基-3-甲基咪唑鎓氯化物）与五种总有机碳（TOC）含量不同的土壤进行了研究。实验结果表明，随着土壤TOC含量的增加以及离子液体阳离子疏水性的增强，吸附容量增大。所获得的动力学吸附参数以及分配系数（K(d)）被用于评估所研究的土壤类型对相关离子液体的吸附特性。吉布斯自由能值表明，离子液体阳离子在土壤上的吸附通常可被视为具有放热效应的物理吸附。但是，对于TOC含量非常高（45%）的土壤，所研究阳离子在其上吸附的-dG值可能证明其具有化学吸附的性质。被分析化合物的吸附可能是通过与土壤中的有机物和粘土矿物形成氢键、静电作用以及π-π相互作用来实现的。
