Functionalized KIT-6/Polysulfone Mixed Matrix Membranes for Enhanced CO2/CH4 Gas Separation

Abstract

The development of mixed matrix membranes (MMMs) for effective gas separation has been gaining popularity in recent years. The current study aimed at the fabrication of MMMs incorporated with various loadings (0–4 wt%) of functionalized KIT-6 (NH2KIT-6) [KIT: Korea Advanced Institute of Science and Technology] for enhanced gas permeation and separation performance. NH2KIT-6 was characterized by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and N2 adsorption–desorption analysis. The fabricated membranes were subjected to FESEM and FTIR analyses. The effect of NH2KIT-6 loading on the CO2 permeability and ideal CO2/CH4 selectivity of the fabricated membranes were investigated in gas permeation and separation studies. The successfulness of (3-Aminopropyl) triethoxysilane (APTES) functionalization on KIT-6 was confirmed by FTIR analysis. As observed from FESEM images, MMMs with no voids in the matrix were successfully fabricated at a low NH2KIT-6 loading of 0 to 2 wt%. The CO2 permeability and ideal CO2/CH4 selectivity increased when NH2KIT-6 loading was increased from 0 to 2 wt%. However, a further increase in NH2KIT-6 loading beyond 2 wt% led to a drop in ideal CO2/CH4 selectivity. In the current study, a significant increase of about 47% in ideal CO2/CH4 selectivity was achieved by incorporating optimum 2 wt% NH2KIT-6 into the MMMs.

The new Schiff‐base complex of copper(II) grafted on mesoporous KIT‐6 as an effective nanostructure catalyst for the homoselective synthesis of various tetrazoles

“…The produced KIT‐6 and the catalyst are uniformly mesoporous, as shown by the sample's IUPAC categorization of IV isotherm 73 . The catalyst exhibits a type IV(a) isotherm with H1 type hysteresis loop, which is characteristic of mesoporous materials even after stabilization of Cu(II)[Sal(PMeOSi)DETA] on KIT‐6 74–78 . The synthesized catalyst has a surface area of 174.14 m 2 /g, according to the BET diagram which is lower than the mesoporous surface area of KIT‐6 (581.14 m 2 /g) 72 and the pore volume of Cu(II)[Sal(PMeOSi)DETA]@KIT‐6 catalyst is equal to 0.3218 cm 3 /g, which is less than the pore volume of KIT‐6 (0.7734 cm 3 /g) 72 .…”

Annealing and TMOS coating on PSF/ZTC mixed matrix membrane for enhanced CO 2 /CH 4 and H 2 /CH 4 separation

“…Mohamat et al [31] reported that the incorporation of 3wt% zeolite T in polysulfone membrane enhanced CO 2 /CH 4 selectivity from 2.63 to 3.37, with CO 2 permeability of 78.90 GPU. On the other hand, the presence of 2 wt% of KIT-6 (KIT: Korea Advanced Institute of Science and Technology), a silica mesoporous, could improve CO 2 /CH 4 selectivity to 32.4, with CO 2 permeability of 5.4 Barrer [32]. However, the disadvantage of MMM is the weak interaction between the polymer matrix and the filler, which can form voids [33] and thereby reduce the separation performance.…”

Modeling CO2 and N2 Permeation through Mixed Matrix Membranes Containing Oxygenated Carbon Nanotubes Dispersed in Polysulfone

“…These systems can be potentially used to address the problems of permeability and selectivity tradeoff. It is composed of a solid phase dispersed in a polymer [1]. The high selectivity of the solid filler, attributable to the increase in the number of voids, promotes the permeation of small molecules and improves the permeant sorption selectivity.…”

“…Recently, a combination of diffusion and sorption selectivities has been used to fabricate MMMs. Amine-functionalized mesoporous silica that can be used as fillers in MMMs to achieve CO 2 separation has gained importance [1]. Different fillers, such as zeolites and silica, have been investigated [2].…”