| 董志强,徐素玮,孙境蔚,施心怡,邱宇平.咪唑离子液体在砂土中的吸附与运移[J].农业环境科学学报,2017,36(5):930-935. |
| 咪唑离子液体在砂土中的吸附与运移 |
| Sorption and transport of imidazolium-based ionic liquid (IBILs) in sand soil columns |
| 投稿时间：2016-11-25 |
| DOI：10.11654/jaes.2016-1503 |
| 中文关键词: 离子液体 砂土 运移 吸附 |
| 英文关键词: ionic liquid sand soil transport sorption |
| 基金项目:国家自然科学基金项目（21377093， 21677108） |
| 作者 | 单位 | E-mail | | 董志强 | 污染控制与资源化研究国家重点实验室, 同济大学环境科学与工程学院, 上海 200092 | | | 徐素玮 | 污染控制与资源化研究国家重点实验室, 同济大学环境科学与工程学院, 上海 200092 | | | 孙境蔚 | 污染控制与资源化研究国家重点实验室, 同济大学环境科学与工程学院, 上海 200092 | | | 施心怡 | 污染控制与资源化研究国家重点实验室, 同济大学环境科学与工程学院, 上海 200092 | | | 邱宇平 | 污染控制与资源化研究国家重点实验室, 同济大学环境科学与工程学院, 上海 200092 | ypqiu@tongji.edu.cn |
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| 中文摘要: |
| 研究了三种咪唑离子液体（[C2MIM][PF6]，[C4MIM][PF6]和[C4MIM][BF4]）在砂土环境中的静态吸附与动态运移规律，讨论了离子液体阴/阳离子结构变化对其吸附/运移行为的影响。结果表明：三种离子液体的砂土吸附系数（Kd）介于4.3~7.7 L·kg-1之间，整体吸附量偏低，暗示其环境迁移能力强。在静态吸附中，随着阳离子碳链长度从C2增加到C4，离子液体的吸附能力得到提升，迁移能力随之下降，相比而言，阴离子（PF6-和PF4-）的改变对Kd几乎没有影响；然而在动态柱实验中，阴离子变化能影响阻滞系数R值的大小，这得益于离子液体在土柱中经历反复的吸附-脱附过程，从而使阴离子之间的差异得以放大。首次采用CXTFIT软件对离子液体的运移进行数值模拟发现，其观察值和模拟值高度吻合，表明非平衡模型适合定量描述和预测离子液体在环境中的运移规律。 |
| 英文摘要: |
| In this work, batch experiments and column experiments were conducted to investigate the sorption and transport of [C2MIM][PF6], [C4MIM][PF6] and [C4MIM][BF4] in sand-soil system, and the influence of IBILs anion/cation structure on IBILs sorption/transport was discussed. It showed that the soil sorption coefficient (Kd) of three IBILs ranged from 4.3 to 7.7 L·kg-1. The low total sorption capacity of IBILs suggested their high environmental mobilities. In batch experiments, with the increase of carbon chain length of IL cations from C2 to C4, the adsorption of IBILs improved. Accordingly, the migration ability of IBILs in soils decreased. In contrast, the change of anions (PF6- and PF4-) showed the negligible impact on Kd of IBILs. However, in the column experiments, the change of anions can affect the retardation coefficient (R value), which was due to the repeated sorption-desorption process of IBILs in the sand-soil column. Therefore, the influence of IBILs anions was amplified. CXTFIT software was firstly used to simulate the transport of IBILs, and the observed values were in good agreement with the simulated ones, which showed that the non-equilibrium model is suitable for describing and predicting the transport of IBILs in the environment. |
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