In order to improve CO2 flux of ceramic membrane in membrane absorption, the micro Al2O3 ceramic membrane is modified from hydrophilic to hydrophobic, and its surface morphology, wettability and water flux are characterized. The CO2 capture performance of CM before and after modification is studied experimentally. The surface morphology of ceramic membrane has no obvious difference before and after modification. After modification, contact angle increased from 47Â° to 130.9Â° with critical breakthrough pressure 1 bar, and its pure water flux decreased significantly. The mass transfer rate of CO2 at interface of ceramic membrane increases with increase of both absorbent flow rate and flue gas flow rate, and the mass transfer rate of modified ceramic membrane is always higher than that of unmodified ceramic membrane, which means a better CO2 capture performance. We believe this study will provide technical references for industrial CO2 capture applications.
Keywords Ceramic membrane, Hydrophobic, CO2 capture, Mass transfer rate