Superior performance of surface-treated NaX@Pebax-1657 membranes for O₂/N₂ separation

Abstract

In this study, the performances of mixed matrix composite membranes (MMCMs) containing surface-treated NaX nanocrystals (ST-NaX-NCs) were experimentally and theoretically investigated for O2/N2 separation.

CH4‐Selective Mixed‐Matrix Membranes Containing Functionalized Silica for Natural Gas Purification

“…The reduction in T g by adding SNPs as a filler in the polymer matrix was reported earlier in other works [6]. Also, according to other researchers [7,8,10,34], the surface modification of the nanofillers with different functional groups increases the T g of MMMs containing modified nanoparticles compared to the MMMs loaded with unmodified nanoparticles.…”

“…The decrease in the T g of the MMMs containing unmodified SNPs is due to the amorphous structure of silica, which reduces the crystallinity of the membranes and disrupts the polymer chains. The modified SNPs reduced the movement of polymer chains since the carboxylic groups on its surface had a strong interaction with the polymer matrix, and thus the T g of the MMMs was enhanced [7,8]. In other words, the decrease in the segmental motion of the polymer chains that leads to stiffness of the membrane structure due to the strong interaction of the modified SNPs with the polymer matrix is a reason for the increase in the T g of the MMMs containing modified SNPs.…”

“…In this context, various fillers such as zeolites [6][7][8], graphene oxide (GO) [9][10][11][12][13], carbon nanotubes (CNTs) [14,15], SiO 2 [6,16], zinc oxide [17], and metal-organic frameworks (MOFs) including zeolitic imidazolate frameworks (ZIFs) [6,[18][19][20], Material Institute Lavoisier (MIL)-53 [21,22], MIL-101 [19,23], Universitetet i Oslo (UiO)-66 [19,24], and copper(II) benzene-1,3,5-tricarboxylate (CuBTC) [25] were used to improve pure polymeric membrane gas separation performance. In contrast, compatibility between polymers and fillers is usually poor due to differences in their characteristics [2].…”

“…Furthermore, the surface modification of nanofillers avoids their accumulation in the polymer matrix, and merging of these particles improves the performance of the resulting membranes . In the functionalization of the filler, the surface of the filler particles was modified by incorporating functional groups like imidazole , amine , 20–24, , carboxyl , , , , and hydroxyl to avoid the accumulation of fillers, which improved the gas separation performance of the MMMs.…”

Evaluation of polyurethane/nylon 6(3) blend membranes for enhancedCO2separation

“…67 Despite the larger kinetic diameter of CH 4 compared to N 2 , as mentioned in Table 5, the higher permeability of CH 4 than the N 2 can be allocated to the higher condensation temperature of the CH 4 . 68…”