Precise modulation of MOF pore structures via functional group dimensions and spatial configuration for membrane...

Area of Science:

• Materials Science
• Chemical Engineering
• Nanotechnology

Background:

• Traditional petroleum distillation is energy-intensive.
• Membrane separation offers a sustainable alternative.
• Precise control over membrane pore size is crucial for efficient separation.

Purpose of the Study:

• To develop metal-organic framework (MOF) membranes with tunable pore sizes for petroleum fractionation.
• To achieve precise and dual-range pore modulation using ligand functionalization.
• To demonstrate energy-efficient hydrocarbon separation through advanced membrane technology.

Main Methods:

• Ligand functionalization of MOFs with light-responsive azobenzene groups.
• Tailoring steric configurations and spatial orientations for pore size modulation.
• Utilizing reversible trans-to-cis photoisomerization for subnanometer pore precision.

Main Results:

• Achieved broad-range pore tuning (0.41–0.68 nm) and subnanometer precision.
• Demonstrated a four-step sequential separation of branched alkanes, increasing C6H14 purity from 25% to 92.2%.
• Established a constant carbon-atom-count-dependent permeation gradient.

Conclusions:

• MOF-based membranes offer a transformative solution for energy-efficient petroleum fractionation.
• The synergistic approach combines large-scale pore adjustment with dynamic fine-tuning.
• Stable, light-responsive membranes advance sustainable hydrocarbon processing and precise molecular sieving.