Technological advancements in the use of ionic liquid- membrane systems for CO2 capture from biogas/flue gas - A review

Membrane-Based Technologies for Post-Combustion CO2 Capture from Flue Gases: Recent Progress in Commonly Employed Membrane Materials

“…Several distinct types of membrane processes combined with ILs have been investigated, including supported ionic liquid membranes (SILMs), IL composite polymer membranes (ILPMs), IL composite mixed-matrix membranes (ILMMM), poly(ionic liquid) membranes (PILMs), IL gel membranes (ILGMs) and IL membrane contactors (ILMCs). These systems have shown high gas separation efficiency [120].…”

“…Ahmad et al (2018Ahmad et al ( , 2021 [122,123] successfully employed an IL as the continuous phase in an MMM and enhanced its CO 2 separation performance. According to Sanni et al (2022) [120], among the membrane-ionic liquid systems, a hybrid system that is comprised of cellulose acetate, methyl ammonium nitrate and graphene oxide (CA-methyl ammonium nitrate-GO) is a possible candidate with high CO 2 capture (>80%) due to its enhanced porosity, mechanical and thermal stability, good selectivity and low CO 2 permeability. lower than 100 °C [118].…”

A comparative study of ammonia solubility in imidazolium-based ionic liquids with different structural compositions

“…Therefore, an effective and stable electrolyte with high NH 3 solubility is highly desired. Numerous studies have extensively explored NH 3 solubility in conventional solvents, such as water, acetone, butanol, chlorobenzene, ethylene glycol, methanol, tetrahydrofuran, acetic acid, and mixed solvents [ 2 , 4 ]. For example, ethylene glycol exhibited excellent NH 3 solubility because of the strong interaction between ammonium and the hydroxyl groups of the ethylene glycol [ 2 ].…”

“…The aforementioned challenges can be effectively addressed by employing structure-tunable imidazolium-based ionic liquids (ILs) [ [8] , [9] , [10] ], which not only offer high NH 3 solubility and selectivity but also facilitate efficient separation and energy-saving procedures. Such ILs exhibit additional advantages, such as high thermal stability, excellent ionic conductivity, wide electrochemical potential windows, and negligible vapor pressure and flammability [ 3 , 4 , [7] , [8] , [9] , [11] , [12] , [13] , [14] , [15] ]. Despite facing challenges such as elevated viscosity, cost inefficiency, environmental toxicity, and non-biodegradability [ 8 , 16 ], imidazolium-based ILs have been the subject of numerous studies exploring NH 3 solubility.…”