Key Takeaways & Executive Findings
- •• • The GO-SPABS membrane achieves enhanced CO2/N2 separation performance under humidified conditions, leveraging Na+ and sulfonic acid groups as CO2-philic active sites, with a large-area membrane (15 cm × 20 cm) fabricated by blade-casting showing reproducible results. • • The multifunctional molecule SPABS enables uniform Na+ intercalation via nucleophilic addition between amino groups and epoxy groups on GO, ensuring stable interlayer channels and preventing aggregation, which is critical for consistent membrane performance. • • The hydrophilic sulfonic acid groups increase water adsorption in the interlayer, synergizing with Na+ to facilitate facilitated transport of CO2 over N2, leading to high selectivity and permeability, though exact values are not provided in the abstract. • • The scalable blade-casting method for large-area membranes (15 cm × 20 cm) demonstrates potential for industrial scale-up, addressing a key bottleneck in 2D material membrane fabrication.
Abstract
The development of high-performance CO2 separation membranes is critical for advancing carbon capture technologies. Two-dimensional (2D) material membranes, with tunable interlayer nanochannels functionalized by nanomaterials (e.g., metal ions), are promising for CO2 capture. However, achieving uniform nanomaterial distribution without compromising separation performance remains a challenge. Here, we propose a multifunctional molecular immobilization strategy to fabricate a metal ion intercalated graphene oxide (GO) membrane with enhanced CO2 capture performance. The multifunctional molecule sodium p-aminobenzenesulfonate (SPABS) enables in situ and uniform distribution of Na+ in the interlayer channels of the GO membrane. The amino groups of SPABS undergo nucleophilic addition reactions with epoxy groups on GO sheets, resulting in stable interlayer channels. Meanwhile, the hydrophilic sulfonic acid groups enhance water adsorption capacity in the GO interlayer channels, synergizing with Na+ to form active sites that facilitate fast and selective transport of CO2 over N2. The resulting membrane exhibits enhanced CO2 capture performance. A large-sized membrane (15 cm × 20 cm) fabricated by scalable blade-casting shows reproducible performance. This work provides insights and a tool for tailoring nanochannels of 2D material membranes for molecular separation.
1. Introduction
Global warming driven by excessive CO2 emissions necessitates energy-efficient carbon capture technologies. Membrane separation offers environmental friendliness, low energy consumption, and operational simplicity, but conventional polymer membranes suffer from a permeability–selectivity trade-off. Two-dimensional (2D) materials, particularly graphene oxide (GO), provide tunable interlayer nanochannels that can achieve high selectivity, yet pristine GO membranes exhibit undesirable channel microenvironments and instability, limiting their separation performance.
Prior strategies such as polymer-assisted assembly or nanocrystal incorporation have improved performance but often result in non-uniform nanomaterial distribution, compromising reproducibility. This work introduces a multifunctional molecular immobilization strategy using sodium p-aminobenzenesulfonate (SPABS) to achieve uniform Na+ intercalation within GO interlayers. The amino groups covalently anchor to GO epoxy groups, stabilizing the channels, while sulfonic acid groups enhance water uptake, creating active sites that synergize with Na+ for facilitated CO2 transport. This approach directly addresses the bottleneck of uniform functionalization and scalability, demonstrating a large-area membrane with reproducible performance.
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CHEN Huimin, LIU Song, LIU Guozhen, XU Rong, LIU Gongping, JIN Wanqin (2026). Multifunctional Molecule-Aided Intercalation of Metal Ions into Graphene Oxide Membrane for CO2 Capture. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3835-0
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Frequently Asked Questions
What is the exact CO2/N2 separation performance (permeance and selectivity) of the GO-SPABS membrane under humidified conditions?
The abstract does not provide specific numerical values for CO2 permeance or CO2/N2 selectivity. However, the membrane exhibits enhanced CO2 capture performance, and the large-area membrane (15 cm × 20 cm) shows reproducible performance. For detailed metrics, refer to the full paper's results section.
How does the SPABS immobilization ensure uniform Na+ distribution, and what is the chemical mechanism for channel stability?
SPABS contains amino groups that undergo nucleophilic addition with epoxy groups on GO sheets, covalently anchoring the molecule and preventing Na+ aggregation. This in situ immobilization ensures uniform distribution of Na+ within the interlayer channels, while the covalent bonds stabilize the channel structure.
What is the role of water adsorption in the facilitated transport of CO2, and how does it affect selectivity over N2?
The hydrophilic sulfonic acid groups of SPABS enhance water adsorption in the interlayer channels. Under humidified conditions, water molecules hydrate Na+ ions, forming active sites that reversibly react with CO2 to form bicarbonate, facilitating its transport. N2, being non-reactive, is excluded, leading to high CO2/N2 selectivity.
What is the scalability potential of the blade-casting method for industrial production?
The blade-casting method successfully fabricated a large-area membrane (15 cm × 20 cm) with reproducible performance, indicating that the process is scalable. This addresses a key challenge in 2D material membrane manufacturing, where uniform defect-free large-area films are difficult to produce.
What are the long-term stability and mechanical robustness of the GO-SPABS membrane under operational conditions?
The abstract does not provide long-term stability data. However, the covalent bonding between SPABS and GO suggests enhanced structural stability compared to physically intercalated ions. Further studies on long-term performance under continuous operation are needed to assess industrial viability.
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