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Graphene quantum dot membranes with tailorable pores for efficient gas separation
Xinjing Zhang1,2, Qiuxia Feng1,2, Liming Zhang1,2
1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, China.
Nature Communications
|March 5, 2026
Summary
This study introduces a novel post-regulation strategy for graphene quantum dot (GQD) membranes. This method allows tunable pore structures for efficient gas separation, simplifying membrane preparation and enhancing performance for CO2 capture.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Membrane technology often requires co-development of materials and fabrication methods, limiting adaptability.
- A simplified approach is needed to meet diverse gas separation requirements.
Purpose of the Study:
- To develop a post-regulation strategy for tuning membrane pore structures.
- To create adaptable graphene quantum dot (GQD) membranes for various gas separations.
Main Methods:
- Constructing continuous GQD membranes by stacking GQDs.
- Tuning pore structure via heat treatment and in-situ cross-linking with amine molecules.
- Utilizing adjustable angstrom-scale pores and preferential CO2 adsorption.
Main Results:
- GQD membranes exhibited widely tunable CO2/N2 and CO2/CH4 separation performances.
- Achieved CO2 permeance and separation factors surpassing reported membranes, meeting industrial CO2 capture targets.
- Demonstrated extended separation scope to C3H6/C3H8 by varying heat treatment.
Conclusions:
- The post-regulation pore structure strategy simplifies membrane preparation and accelerates advancement.
- Customizable GQD membranes show high potential for diverse and challenging gas separations.
- This approach enhances the adaptability of membrane technology.
