Nanofiltration across Defect-Sealed Nanoporous Monolayer Graphene

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Monolayer nanoporous graphene is promising for molecular separations but hindered by defects.
• Leakage through defects limits the practical application of graphene membranes.

Purpose of the Study:

• To develop a method for creating defect-tolerant, large-scale monolayer nanoporous graphene membranes.
• To demonstrate the efficacy of these membranes in molecular separation processes.

Main Methods:

• A multiscale leakage-sealing process was employed, leveraging graphene's nonpolar nature and impermeability.
• Subnanometer pores were introduced into the graphene layer.
• The resulting membrane was tested for its separation capabilities.

Main Results:

• A centimeter-scale, defect-tolerant monolayer graphene membrane was successfully fabricated.
• The membrane demonstrated rejection of multivalent ions and small molecules.
• Observed water flux aligned with molecular dynamics simulations.

Conclusions:

• The developed process enables the construction of defect-tolerant graphene membranes.
• These membranes show significant potential for applications in nanofiltration and desalination.
• This work paves the way for advanced separation technologies using atomically thin materials.