Effects of Soil Characteristics on Sorption-Desorption of 1-butyl-3-methyl-imidazolium-based Ionic Liquids

• Published in: Journal of agricultural resources and environment Vol. 34; no. 1; p. 30
• Main Authors: Li, Yue, Si-Cong, Lei, Shi, Yan, Yu-Ping, Qiu
• Format: Journal Article
• Language: Chinese
• Published: Tianjin Journal of Agricultural Resources and Environment (JARE) 01.01.2017
• Subjects: Adsorption; Anions; Clay minerals; Clay soils; Desorption; Electrostatic properties; Environmental science; Hydrology; Hydrophobicity; Hysteresis; Ionic liquids; Ions; Minerals; Organic chemistry; Organic matter; Organic soils; Sediments; Soil characteristics; Soil contamination; Soil organic matter; Soils; Solvents; Sorption; United States > US; England
• ISSN: 2095-6819; 2095-6819
• DOI: 10.13254/j.jare.2016.0233

研究了2 种咪唑类离子液体（ILs）—氯化1-丁基-3-甲基咪唑（[Bmim][Cl]）和1-丁基-3-甲基咪唑双三氟甲磺酰亚胺盐（[Bmim][（CF3SO2）2N]）在16种土壤上的吸附/脱附规律，探讨了土壤理化性质对于吸附/脱附行为的影响。研究发现，[Bmim][Cl]和[Bmim][（CF3SO2）2N]的土壤吸附系数与土壤阳离子交换量（CEC）呈正相关性，相关系数（R2）分别为0.842 9和0.835 3（P<0.05），表明土壤主要通过静电作用来吸附ILs，而与土壤总有机碳含量（TOC%）的R2 值仅分别为0.003 5和0.073 0（P< 0.01），说明ILs 与土壤有机质的疏水结合作用为相对次要。ILs 阴离子基团对吸附行为有一定的影响，但并不明显。ILs 吸附/脱附的迟滞系数（HI）均小于1,可能与（ILs）在土壤粘土/有机质上的不可逆结合有关。其中，CEC 和[Bmim][Cl]和[Bmim][（CF3SO2）2N]的HI之间存在较大的相关性（R2分别为0.772 9，0.781 5，P<0.01），说明CEC 对迟滞行为有着不可忽视的影响。 Effects of soil characteristics on sorption-desorption of 1-butyl-3-methyl-imidazolium-based ionic liquids([Bmim][Cl] and [Bmim][(CF3SO2)2N])by sixteen natural soils were studied. The value of sorption coefficient Kd of [Bmim][Cl] and [Bmim][(CF3SO2)2N] ranged from 2.5 to 15.9 L·kg-1 and 2.9 to 16.4 L·kg-1, respectively. The high positive correlation could be observed between the soil CEC and the Kd of [Bmim][Cl] and [Bmim][(CF3SO2)2N](R2=0.842 9 and 0.835 3, P<0.05, respectively). In contrast, TOC exhibited the weak correlati