Cu-BTC/aminated graphite oxide composites as high-efficiency CO2 capture media

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Metal-Organic Frameworks (MOFs) like Cu-BTC are promising for CO2 capture.
• Graphite oxide (GO) is a versatile carbon material.
• Composite materials can enhance MOF performance.

Purpose of the Study:

• To synthesize and evaluate Cu-BTC/aminated graphite oxide composites for CO2 adsorption.
• To investigate the impact of nitrogen content on composite performance.
• To assess adsorption capacity, selectivity, heat of adsorption, and regenerability.

Main Methods:

• Synthesis of Cu-BTC/aminated graphite oxide composites.
• Measurement of CO2 adsorption isotherms up to 1.5 MPa at near-ambient temperatures.
• Analysis of adsorption capacity, isosteric heat, selectivity (vs. CH4 and N2), and regenerability.

Main Results:

• Composites significantly outperform the parent Cu-BTC MOF in CO2 adsorption.
• The MOF/GO-U3 composite, with high N content, exhibited the highest capacity (13.41 mmol/g at 1.5 MPa, 298 K).
• High selectivity for CO2 over CH4 was observed; N2 selectivity depends on the MOF phase. Composites show low heat of adsorption and high surface homogeneity.

Conclusions:

• Cu-BTC/aminated graphite oxide composites are effective CO2 adsorbents.
• Optimizing nitrogen content in graphite oxide enhances CO2 capture performance.
• The developed composites offer efficient, regenerable, and selective CO2 capture with low energy demand.