Organic Solvent Nanofiltration Membrane with In Situ Constructed Covalent Organic Frameworks as Separation Layer.
Fangyi Xu1,2, Shuxin Zhao1,2, Junjie Song1,2
1Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 238 Songling Road, Qingdao 266100, China.
Membranes
|November 26, 2024
Summary
This study developed a novel covalent organic framework (COF) membrane for organic solvent nanofiltration (OSN). The resulting TpPa/polyimide membrane shows excellent performance in separating organic solutions with high efficiency and solvent resistance.
Area of Science:
- Materials Science
- Chemical Engineering
- Separation Science
Background:
- Organic solvent nanofiltration (OSN) offers low energy and eco-friendly separation of organic solutions.
- Covalent organic frameworks (COFs) show promise for improving OSN membrane performance in solvent transport and molecular sieving.
Purpose of the Study:
- To construct a novel TpPa/polyimide (PI) OSN membrane using in situ interfacial polymerization.
- To evaluate the separation performance and solvent resistance of the developed COF membrane.
Main Methods:
- In situ interfacial polymerization of p-phenylenediamine (Pa) and 1,3,5-trimethoxybenzene (Tp) to form a TpPa COF skin layer on a polyimide substrate.
- Crosslinking and activation steps to obtain the final TpPa/PI OSN membrane.
Main Results:
- The optimized TpPa/PI OSN membrane achieved an ethanol permeance of 58.0 LMH/MPa.
- Demonstrated a high fast green FCF (FGF) rejection rate of 96.2%.
- Exhibited a pure n-hexane permeance of 102.0 LMH/MPa and good solvent resistance.
Conclusions:
- The developed TpPa/PI OSN membrane is effective for separating, purifying, and concentrating organic solvents.
- The COF-based membrane technology offers a promising solution for advanced OSN applications.
- The membrane's robust solvent resistance ensures its suitability for demanding industrial processes.
