The Effect of Microporous Polymeric Support Modification on Surface and Gas Transport Properties of Supported Ionic Liquid Membranes

Abstract

Microporous polymers based on anionic macroinitiator and toluene 2,4-diisocyanate were used as a support for 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([emim][Tf2N]) immobilization. The polymeric support was modified by using silica particles associated in oligomeric media, and the influence of the modifier used on the polymeric structure was studied. The supported ionic liquid membranes (SILMs) were tested for He, N2, NH3, H2S, and CO2 gas separation and ideal selectivities were calculated. The high values of ideal selectivity for ammonia-based systems with permanent gases were observed on polymer matrixes immobilized with [bmim][PF6] and [emim][Tf2N]. The modification of SILMs by nanosize silica particles leads to an increase of NH3 separation relatively to CO2 or H2S.

Experimental Evaluation of the Efficiency of Membrane Cascades Type of “Continuous Membrane Column” in the Carbon Dioxide Capture Applications

“…As a preliminary study, the gas transport characteristics were determined and the ideal and apparent (effective) selectivities of the MDK-3 membrane and the symmetric membrane based on quaternized chitosan were calculated. The permeability of individual gases was measured by the Daynes-Barrer time lag method [36,37] detailed in previous papers of the authors [38][39][40]. To determine the permeability of the components of the gas mixture and calculate the effective selectivity of the MDK-3 membrane, the gas chromatographic method was used as described in detail in [41,42].…”

Biomolecule functionalized magnetite nanoparticles efficiently adsorb and remove heavy metals from contaminated water

“…This clearly indicates the capping of MNP has increased the stability of the MNP compared to bare MNP under acidic condition used for regeneration. Such high stability of MNP after capping might be due to the resistance to the permeability of Fe(III) as starch and casein capping acts as support material and prevents leaching of Fe(III) ions . Furthermore, casein and starch support also plays an important role in avoiding air void that decreases adsorption efficiency of nano‐adsorbents .…”

“…Such high stability of MNP after capping might be due to the resistance to the permeability of Fe(III) as starch and casein capping acts as support material and prevents leaching of Fe(III) ions. [68][69][70] Furthermore, casein and starch support also plays an important role in avoiding air void that decreases adsorption efficiency of nano-adsorbents. [68][69][70] Hence, we confirmed that both MNP ST and MNP CS posses better potential as nano-adsorbents with excellent regeneration capacity compared to MNP towards removal of heavy metals from contaminated water for a number of cycles.…”

Ionic Liquids‐Based Membranes for Carbon Dioxide Separation

“…SILMs is one of the most attractive methods for separating CO 2 from gas mixture. It is the first solution proposed that combining the excellent properties of ILs and polymer membranes together . Resembled to traditional amine‐based aqueous solvents, ILs were immobilized in porous membranes to act as the liquid separating phase materials.…”

“…It is the first solution proposed that combining the excellent properties of ILs and polymer membranes together. [23,24,25] Resembled to traditional aminebased aqueous solvents, ILs were immobilized in porous membranes to act as the liquid separating phase materials. The incorporation of ionic liquids enhanced the stabilization as ILs have negligible vapor pressure and relatively high viscosity (resistance to leaking-out by high pressure differentials).…”