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| Sorption and transport of imidazolium-based ionic liquid (IBILs) in sand soil columns |
| Received:November 25, 2016 |
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| KeyWord:ionic liquid;sand soil;transport;sorption |
| Author Name | Affiliation | E-mail | | DONG Zhi-qiang | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | XU Su-wei | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | SUN jing-wei | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | SHI Xin-yi | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | QIU Yu-ping | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | ypqiu@tongji.edu.cn |
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| Abstract: |
| 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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