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Enabling Covalent Organic Framework Nanofilms for Molecular Separation: Perforated Polymer-Assisted Transfer
Ankang Xiao1, Zhe Zhang1, Xiansong Shi1
1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering , Nanjing Tech University , Nanjing 211816 , Jiangsu , P. R. China.
ACS Applied Materials & Interfaces
|November 6, 2019
Summary
We developed a new method to create covalent organic framework (COF) membranes for molecular separation. This technique uses a perforated polymer-assisted transfer strategy for fabricating COF nanofilms, enabling efficient and controllable membrane production.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Covalent organic frameworks (COFs) are gaining attention for membrane separation due to their ordered sub-2 nm pores.
- Fabricating effective and controllable COF-based membranes remains a challenge.
Purpose of the Study:
- To demonstrate a novel perforated polymer-assisted transfer strategy for creating COF nanofilms for molecular separation.
- To develop a new type of composite membrane with enhanced separation performance.
Main Methods:
- Solvothermal synthesis of TpPa COF on silicon substrates.
- Coating and perforating a block copolymer layer for pore generation and protection.
- Transferring COF nanofilms onto porous substrates to form composite membranes.
Main Results:
- Continuous, crystalline, and tunable thickness COF nanofilms were successfully synthesized.
- The composite membranes exhibited high water permeance (∼51 L m⁻² h⁻¹ bar⁻¹).
- High rejection rates for various dyes were achieved, demonstrating effective molecular separation.
Conclusions:
- A new method for preparing COF-based membranes for molecular separation was demonstrated.
- The perforated polymer-assisted transfer technology offers a versatile approach for transferring ultrathin materials.
- This technology is expected to advance the development of advanced separation membranes.
