Holmium-Containing Metal-Organic Frameworks as Modifiers for PEBA-Based Membranes

Area of Science:

• Materials Science
• Chemical Engineering
• Membrane Technology

Background:

• Hybrid polymeric materials are crucial for advanced applications, especially in membrane technology.
• Metal-organic frameworks (MOFs) are topical modifiers that can significantly enhance mixed matrix membranes (MMMs).

Purpose of the Study:

• To synthesize novel holmium-based MOFs (Ho-MOFs) for modifying polyether block amide (PEBA).
• To develop new MMMs with improved properties using PEBA and Ho-MOFs.
• To evaluate the impact of Ho-MOFs on membrane transport properties for dye removal.

Main Methods:

• Synthesis of Ho-MOFs with varying ligands.
• Characterization using X-ray phase analysis, microscopy (SEM, AFM), FTIR, and N2 adsorption.
• Membrane fabrication and testing via vacuum fourth-stage filtration.
• Analysis of membrane properties including viscosity, light scattering, GPC, TGA, and contact angle.

Main Results:

• Synthesized Ho-MOFs exhibited diverse structures, forms, and sizes based on the ligand.
• PEBA/Ho-MOF membranes showed enhanced flux and rejection for dyes with amino groups.
• Optimal properties were observed with the PEBA/Ho-1,3,5-H3btc membrane, achieving 81% Congo Red and 68% Fuchsin rejection with 0.7 L/(m2s) flux.

Conclusions:

• Ho-MOFs are effective modifiers for PEBA, creating advanced MMMs.
• The developed MMMs demonstrate superior performance in separating specific dyes.
• This research contributes to the development of novel materials for efficient membrane-based separation processes.