Tianjin University Develops Novel Membrane for Enhanced Carbon Capture
Researchers at Tianjin University have engineered a new type of fully organic mixed-matrix membrane that could lead to more efficient and scalable carbon capture. The development was published in Nature Energy.
A research team at Tianjin University has developed a novel fully organic mixed-matrix membrane that offers a more efficient and scalable approach to carbon capture. The membrane successfully combines high separation performance with long-term stability, addressing previous challenges in the field.
The study, published online on October 10 in the journal Nature Energy, tackles the persistent difficulties in separating carbon dioxide from industrial flue gases. Effective membranes require rapid CO2 transport while simultaneously separating other gases and maintaining consistent performance over time.
Traditional mixed-matrix membranes integrate the processability of polymers with the efficient molecular transport properties of porous fillers. However, development has been hindered by compatibility issues between these components. The Tianjin team proposed a "weak interaction embedding" strategy, balancing the interactions between the filler and the polymer.
By utilizing single-crystal covalent organic frameworks (COFs) as porous fillers, researchers achieved uniform dispersion within the 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 with simulated flue gas demonstrated a tenfold increase in CO2 permeability, setting a new benchmark. The membrane also exhibited high long-term stability, maintaining its performance under continuous operation and in the presence of water vapor, sulfur dioxide, and nitrogen oxides. A preliminary techno-economic analysis estimated the cost of carbon capture at approximately $38 per ton of CO2.