CO2 capture based on Al2O3 ceramic membrane with hydrophobic modification

In this paper, Al 2 O 3 ceramic membrane is modified to hydrophobicity by grafting 1 H,1 H,2 H,2 H-perfluorodecyltriethoxysilane. And its properties are characterized in detail. CO 2 capture performance of ceramic membrane is investigated by experiments. Results show that wetting resistance after modification is significantly improved, and contact angle increases from the initial 49.8–130.9°. However, hydrophobic modification has no significant effect on the crystalline phase, surface morphology and pore size distribution of the ceramic membrane. With ethanolamine (MEA) as absorbent, CO 2 mass transfer rate and capture efficiency using modified hydrophobic ceramic membrane are 46.6 × 10 −3 mol/(m 2 ·s) and 98.0%, showing significantly increase compared to the original membrane. After 72 h immersion in MEA solution, quality of ceramic membrane does not change significantly. And there is almost no change in average pore size. We believe this study will provide a reference for the industrial application for CO 2 capture by gas-liquid membrane contactor with ceramic membrane.