Catalysis

Engineering

Oxide

Metallurgy

Materials science

Graphene

Biochemistry

Chemical engineering

Gas separation

Nanotechnology

Organic chemistry

Membrane

Permeance

Ionic bonding

Chemistry

Selectivity

Ionic liquid

ACS Nano

Membrane separation of CO2 from H2, N2, or CH4 has economic benefits. However, the trade-off between selectivity and permanence in membrane separation is challenging. Here, we prepared a high-performance CO2-philic membrane by confining the [BMIM][BF4] ionic liquid to the nanochannels in a laminated graphene oxide membrane. Nanoconfinement causes the [BMIM][BF4] cations and anions to stratify. The layered anions facilitate CO2 transportation with a permeance of 68.5 GPU. The CO2/H2, CO2/CH4, and CO2/N2 selectivities are 24, 234, and 382, respectively, which are up to 7 times higher than that of GO-based membranes and superior to the 2008 Robeson upper bound. Additionally, the resultant membrane has a high-temperature resistance, long-term durability, and high-pressure stability, indicating its great potential for CO2 separation applications. Nanoconfining an ionic liquid into the two-dimensional nanochannels of a laminated membrane is a promising gas separation method and a nice system for investigating ionic liquid behavior in nanoconfined environments.

Ionic Liquid Selectively Facilitates CO<sub>2</sub> Transport through Graphene Oxide Membrane

Ionic Liquid Selectively Facilitates CO2 Transport through Graphene Oxide Membrane

Ionic Liquid Selectively Facilitates CO₂ Transport through Graphene Oxide Membrane