Tianjin University Develops New Membrane for Carbon Capture
Researchers at Tianjin University have developed a novel fully organic mixed-matrix membrane that could improve the efficiency of industrial carbon capture. The new material offers high separation performance and long-term stability.
A research team at Tianjin University has developed a new type of fully organic mixed-matrix membrane that could offer a more efficient and scalable approach to carbon capture. The method combines high separation performance with long-term stability and large-scale processing capability.
The study, published online on October 1 in Nature Energy, focuses on separating carbon dioxide from industrial flue gases. A challenge with traditional membrane separation has been achieving the necessary rapid CO2 transport while effectively separating other gases and maintaining stable performance over time.
To address compatibility issues between components, the Tianjin University team, led by Professors Jiang Zhongyi and He Guangwei, proposed a "low-interaction embedding strategy." They used single-crystal covalent organic frameworks (COFs) as porous fillers, enabling uniform incorporation with high loading within a polymer matrix.
The resulting membrane retained the polymer's flexibility and processability, while the ordered pores of the COF crystals provided efficient pathways for CO2 transport. Tests using simulated flue gases showed a tenfold increase in CO2 permeability, setting a new record. Performance also remained stable during prolonged operation and in conditions containing water vapor, sulfur oxides, and nitrogen oxides.
Preliminary techno-economic analysis estimates the cost of carbon capture at approximately $38 per ton of CO2. The researchers indicate that this work could open new avenues for mixed-matrix membrane separations and support future applications in carbon capture from power generation, cement, and steel production.