Synthesis and Characterisation of ETS-10/Acetate-based Ionic Liquid/Chitosan Mixed Matrix Membranes for CO2/N2 Permeation

Abstract

Mixed matrix membranes (MMMs) were prepared by incorporating organic surfactant-free hydrothermally synthesised ETS-10 and 1-ethyl-3-methylimidazolium acetate ionic liquid (IL) to chitosan (CS) polymer matrix. The membrane material characteristics and permselectivity performance of the two-component membranes were compared with the three-component membrane and the pure CS membrane. The addition of IL increased CO2 solubility of the polymer, and, thus, the CO2 affinity was maintained for the MMMs, which can be correlated with the crystallinity, measured by FT-IR, and void fraction calculations from differences between theoretical and experimental densities. The mechanical resistance was enhanced by the ETS-10 nanoparticles, and flexibility decreased in the two-component ETS-10/CS MMMs, but the flexibility imparted by the IL remained in three-component ETS-10/IL/CS MMMs. The results of this work provide insight into another way of facing the adhesion challenge in MMMs and obtain CO2 selective MMMs from renewable or green chemistry materials.

Hybrid Ionic Liquid-Chitosan Membranes for CO2 Separation: Mechanical and Thermal Behavior

“…Gas diffusivity was calculated using the constant volume method, as reported in literature [13,15]. Gas solubility was evaluated using a TGA-60H Shimadzu thermo balance where simultaneous TG/DTA analyses were performed.…”

“…In this work, we prepared dense membranes by solution casting in a similar method as previously reported [12,13].…”

Chitosan:poly (vinyl) alcohol composite alkaline membrane incorporating organic ionomers and layered silicate materials into a PEM electrochemical reactor

“…The presence of water in the membrane is usually attributed to a major significance on the ionic conductivity and mechanical strength of anion-exchange membranes. An excessive water content is generally related to a loss of mechanical properties, and an excessive dryness makes the membrane brittle [51]. [12].…”

Comparison of Flat and Hollow‐Fiber Mixed‐Matrix Composite Membranes for CO2 Separation with Temperature

“…In our previous works, we have investigated the performance of MMMs made from highly CO 2‐ selective and permeable materials that overcome the Robeson upper bound in self‐standing configuration, in two approaches: (i) the selectivity and aging resistance of PTMSP has been improved by adding small‐pore zeolites of varying Si/Al ratio and topology , and (ii) the thermal and mechanical resistance and selectivity of CS biopolymer has been improved by adding [emim][Ac] , microporous titanosilicate ETS‐10 , and ZIF‐8 and HKUST‐1 nanoparticles . The effect of temperature on CO 2 /N 2 separation has been studied in the range 298–333 K and the highest CO 2 /N 2 ‐permselective membrane materials were selected in this work to fully explore the effect of the change of geometry on membrane performance.…”