Ionic liquids combined with membrane separation processes: A review

Abstract

Combination of membrane processes and ionic liquids have received more and more attention in pollutants removal because it enhances separation efficiency but also broaden their research and application areas. This review provides a first and systematical summary on ionic liquids incorporate in membrane processes for VOCs or CO2 separation, including supported ionic liquid membranes (SILMs), ILs composite polymer membranes (ILPMs), ionic liquids composite mixed matrix membranes (ILMMMs), poly(ionic liquid)s membranes (PILMs), ionic liquid gel membranes (ILGMs), and ionic liquid membrane contactors (ILMCs).Moreover, a new concept, combination of the membrane separation processes and absorption processes of ionic liquids, is introduced. Those separation processes are described detailly and compared with other conventional processes. With their separation performances and the processes of regeneration, membrane contactor shows stronger competitive advantages and it has the potential to be a major process in VOCs and CO2 separation. The advantages and disadvantages posed by all present ionic liquid membrane processes are summarized. Finally, challenges and opportunities in ionic liquid membrane separation processes are identified and discussed.

Development and Application of Supported Ionic Liquid Membranes in Microbial Fuel Cell Technology: A Concise Overview

“…ILs are salts, comprised of (inorganic or organic) anion and (organic) cation parts that can be varied to adjust the IL properties, in agreement with the actual demands. Accordingly, ILs are taken into account as tailor-made compounds with broad recognition in various chemical-and biotechnological areas, thanks to their negligible vapor pressure (non-volatility), remarkable ionic conductivity, and wide electrochemical potential window [29].…”

Ionic Liquids‐Based Membranes for Carbon Dioxide Separation

“…If the trans‐membrane pressure difference exceeds the capillary forces keeping the ILs, the ILs will be protruded from the pores and the SILMs may fail in practical use. Ionic liquid based composite membranes (ILCMs), which combine the preeminent film forming ability of polymer and the high selectivity of ILs, may address the above problems . Abdollahi et al .…”

“…Ionic liquid based composite membranes (ILCMs), which combine the preeminent film forming ability of polymer and the high selectivity of ILs, may address the above problems. [35,36] Abdollahi et al employed the direct physical mixing method to prepare the membrane by embedding ILs ([Emim][Tf 2 N]) into Matrimid ® 5218 polymer. [37] (Figure 3a) The CO 2 permeability and CO 2 /CH 4 permselectivity of the blended membranes were increased from 7.16 to 20.96 barrer and 31.13 to 42.78 compared to that of pure Matrimid ® 5218, respectively.…”

Effects of ionic liquid concentration on coal low‐temperature oxidation

“…14 Wang et al 15,16 investigated the effects of two ionic liquids with [HSO 4 ]-on oxidative desulfurization of coal. 14 Wang et al 15,16 investigated the effects of two ionic liquids with [HSO 4 ]-on oxidative desulfurization of coal.…”

“…As green organic solvents, ionic liquids can be adopted for VOCs or CO 2 separation. 14 Wang et al 15,16 investigated the effects of two ionic liquids with [HSO 4 ]-on oxidative desulfurization of coal. Ionic liquids can not only enhance the oxidation of -OH, aliphatic -CH 2 -, and aromatic -CH to generate the -COOH group, but also enable organic sulfur structures, that is, -S-S-and -SH, to be removed more efficiently.…”