Facilitate Gas Transport through Metal‐Organic Polyhedra Constructed Porous Liquid Membrane

Abstract

Type II porous liquids are demonstrated to be promise porous materials. However, the category of porous hosts is very limited. Here, a porous host metal–organic polyhedra (MOP‐18) is reported to construct type II porous liquids. MOP‐18 is dissolved into 15‐crown‐5 as an individual cage (5 nm). Both the molecular dynamics simulations and experimental gravimetric CO2 solubility test indicate that the inner cavity of MOP‐18 in porous liquids is unoccupied by 15‐crown‐5 and is accessible to CO2. Thus, the prepared porous liquids show enhanced gas solubility. Furthermore, the prepared porous liquid is encapsulated into graphene oxide (GO) nanoslits to form a GO‐supported porous liquid membrane (GO‐SPLM). Owing to the empty cavity of MOP‐18 unit cages in porous liquids that reduces the gas diffusion barrier, GO‐SPLM significantly enhances the permeability of gas.

Gas Storage in Porous Molecular Materials

“…Peng and co‐workers dissolved MOP‐18, which is decorated with 24 dodecoxy‐functional groups, in 15‐crown‐5. Both the solubility of and permeability toward carbon dioxide was shown to be higher in the porous liquid as compared to neat 15‐crown‐5 [235] . Given the synthetic versatility of both organic and metal–organic cages, we envision the expansion of this small library of porous liquids and their improvement for gas storage applications.…”

Hollow Silica‐Based Porous Liquids Functionalized Mixed Matrix Membranes for CO2 Capture

“…This PL exhibits tailorable and enhanced CO 2 adsorption capacity. In another study, Peng et al [18] . prepared a homogeneous PL based on metal‐organic polyhedra (MOP‐18) and 15‐crown‐5 as the hindered solvent.…”

Research Progress of Porous Liquids

“…reported the construction of a type II porous liquid with porous host molecule of metal–organic polyhedra (MOP‐18) and a bulk solvent of 15‐crown‐5 (Figure 6). [27] The molecular size of the 15‐crown‐5 solvent was larger than the cage size of MOP‐18, so the 15‐crown‐5 in the porous liquid was excluded from the cavities of MOP‐18. Through the molecular dynamics simulation and experimentally gravimetric CO 2 solubility tests, it was confirmed that 15‐crown‐5 with MOP‐18 mass fraction of 5 wt % had permanent porosity.…”

“… Schematic preparation process of porous liquid. Reproduced from ref., [27] Copyright (2020), with permission from Wiley‐VCH.…”