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A review of recent trends and emerging perspectives of ionic liquid membranes for CO2 separation

Highlights•Various types of ionic liquid membranes are reviewed and critically analyzed.•Ionic liquid membranes are efficient, economical and environment friendly.•The characteristics and properties of ionic liquid membrane are tunable.•The functionalized and mixed matrix ionic liquid membranes are more versatile.AbstractIonic liquids (ILs) possess low vapor pressure, thermal stability, wide chemical solubility window and ease of tunability of physical and chemical properties, which makes them attractive solvents. ILs have been successfully examined for CO2 capture processes alone and in combinations with different materials. Recently, ionic liquid-based membranes have exhibited attractive characteristics for CO2 separation. This manuscript introduces various CO2 separation technologies including the ionic liquid membranes (ILMs). The various types of ILMs such as supported ionic liquid membranes (SILMs), room temperature ionic liquid based SILMs, functionalized ILMs, poly ionic liquid membranes, composite membranes, IL-gel membranes, and mixed matrix membranes (MMMs) are discussed in detail. The CO2 permeability and selectivity of CO2 over N2 and CH4 for various membranes are reported and critically analyzed. Furthermore, the stability of the ionic liquid membranes is reported and discussed with respect to the addition ionic liquids, proper size of the porous support, the selection of support of the membrane etc.Graphical abstractDownload : Download high-res image (195KB)Download : Download full-size image

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