Osmotic pressure as driving force for recovering ionic liquids from aqueous solutions

Osmotic pressure as driving force for recovering ionic liquids from aqueous solutions
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渗透压作为从水溶液中回收离子液体的驱动力

DOI:
10.1016/j.memsci.2020.117835
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发表时间:
2020-04
影响因子:
9.5
通讯作者:
Xu Zhi-Kang
Xu Zhi-Kang
中科院分区:
工程技术1区
文献类型:
--
作者:
Liu Chang;An Yun-Peng;Yang Jing;Guo Bian-Bian;Yu Hao-Hao;Xu Zhi-Kang

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由于离子液体在学术和工业应用中的指数增长,因此回收离子液体(IL)面临着新的挑战。我们首次报道了回收水溶性离子液体从其水溶液中的反渗透驱动水自发渗透通过半透膜。理论模拟表明离子液体的水化能力较弱,在水中易形成胶束。因此,我们证明了离子液体和无机盐的水溶液之间的渗透压的显着差异。四类具有广泛代表性的离子液体用半透膜从其稀释水溶液(~1wt%)中连续回收。最终,在这项工作中达到了高达58-78wt%的创纪录的高浓度。该方法综合了离子液体的低能耗、通用性、半透膜的多样性选择、几乎不衰减的水通量和高离子截留率等优势,有望为离子液体真正的“绿色”工业应用提供新的见解。
An emerging challenge occurs for recovering ionic liquids (ILs) because of their exponential growth in academic and industrial applications. We report for the first time to reclaim water-soluble ILs from their aqueous solutions by osmotically driving water to spontaneously permeate through semi-permeable membranes. Theoretical simulation indicates a weak hydrability of ILs and a tendency to form micelles in water. We thus demonstrate a significant difference in osmotic pressures between the aqueous solutions of ILs and inorganic salts. Four categories of broadly representative ILs are continuously recovered from their diluent aqueous solutions (~1wt%) with semi-permeable membranes. Eventually, a record-high concentration up to 58–78wt% is achieved in this work. Our strategy integrates superiorities of low energy consumption, universal applicability toward ILs, diversified selection of semi-permeable membranes, almost unattenuated water flux and high rejection to ions, hopefully providing new insights into the authentic “green” industrial applications of ILs.
通过纳滤浓缩离子液体以进行回收:过滤行为和建模
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