Carbon dioxide capture using covalent organic frameworks (COFs) type material-a theoretical investigation

Area of Science:

• Materials Science
• Computational Chemistry
• Chemical Engineering

Background:

• Porous organic frameworks (POFs) show promise for gas separation and storage.
• Nitrogen-doped materials can enhance interactions with CO2.
• Understanding adsorption mechanisms is crucial for designing efficient capture systems.

Purpose of the Study:

• To investigate the CO2 capture capabilities of nitrogen-containing covalent organic frameworks (COFs).
• To characterize the interaction energies between CO2 and N2 molecules with N-doped COF models.
• To evaluate the influence of linker groups on gas adsorption properties.

Main Methods:

• Density Functional Theory (DFT) calculations were employed.
• First-principle calculations were used to model CO2 adsorption.
• Ab initio and DFT-based methods characterized interaction energies.
• Binding energies were computed using hybrid B3LYP and MP2 methods with various basis sets (Pople 6-31G(d,p), cc-pVDZ, cc-pVTZ, aug-ccVDZ).

Main Results:

• Calculated binding energies quantify the interaction strength of CO2 and N2 with the N-containing COF models.
• The study provides insights into the specific interactions governing CO2 adsorption.
• The effect of different linker groups on adsorption selectivity was analyzed.

Conclusions:

• Nitrogen-containing COFs demonstrate potential for selective CO2 capture.
• DFT calculations provide a reliable method for predicting material performance.
• Further design of linker groups can optimize CO2 adsorption properties.