Selective O₂/N₂ Separation Using Grazyne Membranes: A Computational Approach Combining Density Functional Theory and...

Area of Science:

• Materials Science
• Chemical Engineering
• Nanotechnology

Background:

• Oxygen (O₂) and nitrogen (N₂) separation from air is crucial for various industrial and biological processes.
• Membrane-based gas separation is a widely used and efficient technique.
• Existing membranes face challenges with saturation and selectivity.

Purpose of the Study:

• To investigate grazynes, a class of 2D carbon materials, as potential membranes for O₂/N₂ separation.
• To comprehensively analyze the thermodynamic, kinetic, and dynamic aspects of gas diffusion through grazyne nanopores.

Main Methods:

• Static density functional theory (DFT) calculations.
• Molecular dynamics (MD) simulations.
• Analysis of diffusion rates, selectivity, and permeability for O₂, N₂, CO₂, and Ar.

Main Results:

• Grazyne structures effectively physisorb O₂ and N₂, preventing material saturation.
• Diffusion rates exceed 1 s⁻¹ across a wide temperature range (100–500 K).
• Selectivity for O₂ over N₂ is approximately 2 at 300 K, with O₂ comprising up to 88% of filtered gas in specific grazyne structures.
• Enhanced O₂ enrichment observed even in the presence of CO₂ and Ar.

Conclusions:

• Grazynes are promising candidates for developing advanced O₂/N₂ separation membranes.
• The nano-engineered pores of grazynes facilitate selective gas diffusion.
• Further research into grazyne-based membranes could lead to more efficient air separation technologies.