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Updated: Aug 15, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

Polymorphic Covalent Organic Frameworks: Molecularly Defined Pore Structures and Iodine Adsorption Property.

Canran Wang¹, Shan Jiang², Wenyue Ma¹

¹State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China.

Molecules (Basel, Switzerland)

|January 8, 2023

Summary

Two novel covalent organic frameworks (COFs) were synthesized for radioactive iodine capture. One COF, PyT-1, demonstrated superior iodine adsorption capacity, offering a promising solution for nuclear waste management.

Keywords:

covalent organic framework iodine adsorption polymorphism

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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Area of Science:

Materials Science
Chemistry
Environmental Science

Background:

Radioactive iodine capture is critical for nuclear waste disposal.
Covalent organic frameworks (COFs) show potential for iodine adsorption due to tunable pore structures.
Understanding the structure-property relationship in COFs for iodine adsorption is crucial.

Purpose of the Study:

To investigate the structure-property relationship of polymorphic COFs for radioactive iodine capture.
To synthesize and characterize two COFs with different crystalline structures from the same building blocks.
To evaluate the iodine adsorption performance of these COFs in gaseous and liquid media.

Main Methods:

Synthesis of two polymorphic COFs (PyT-1 and PyT-2) using varied molecular ratios of building blocks.
Characterization of COFs for crystallinity, specific surface area, chemical, and thermal stability.
Adsorption experiments to determine iodine capture capacity in gaseous and liquid phases.

Main Results:

Two COFs, PyT-1 ([C4+C2] topology, AB stacking) and PyT-2 ([C4+C4] topology, AA stacking), were successfully synthesized with high crystallinity and stability.
PyT-1 exhibited a higher maximum adsorption capacity (0.635 g g⁻¹) compared to PyT-2 (0.445 g g⁻¹) for iodine in n-hexane.
Both COFs demonstrated good iodine adsorption properties, with PyT-1 showing more complex pore structures.

Conclusions:

The crystalline structure and pore morphology of COFs significantly influence their iodine adsorption capacity.
Polymorphic COFs offer a viable strategy for designing efficient radioactive iodine adsorbents.
This research provides insights for future molecular design of advanced iodine capture materials for nuclear waste management.