One-Pot Synthesis Method of MIL-96 Monolith and Its CO₂ Adsorption Performance

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Metal-organic frameworks (MOFs) offer tunable properties for gas adsorption.
• MOF monoliths present advantages in handling and application over powders.
• Developing efficient synthesis methods for MOF monoliths is crucial.

Purpose of the Study:

• To develop a novel, simple one-pot synthesis for metal-organic framework (MOF) monoliths.
• To investigate the synthesis of MIL-96 tubular monoliths.
• To evaluate the CO2 adsorption capacity and stability of the synthesized MOF monoliths.

Main Methods:

• Hydrothermal treatment of an α-Al2O3 monolith in an aqueous solution of 1,3,5-benzenetricarboxylic acid and nitric acid.
• Investigating the effects of temperature and nitric acid concentration on MIL-96 crystallization.
• Evaluating CO2 adsorption capacity and storage stability of the MIL-96 monoliths.

Main Results:

• Successfully prepared MIL-96 tubular monoliths using a one-pot hydrothermal method without an external metal source.
• Nitric acid enhanced α-Al2O3 dissolution and MIL-96 growth; temperatures above 453 K were required for crystallization.
• The MIL-96 monoliths exhibited CO2 adsorption capacity comparable to MIL-96 powdery crystals and maintained stability for 2 months.

Conclusions:

• A facile one-pot hydrothermal method enables the synthesis of MIL-96 MOF monoliths.
• The prepared MIL-96 monoliths demonstrate promising CO2 adsorption performance and long-term stability.
• This method offers a viable route for scalable production of MOF monoliths for adsorption applications.