CO2 capture based on Al2O3 ceramic membrane with hydrophobic modification

In this paper, Al2O3 ceramic membrane is modified to hydrophobicity by grafting 1 H,1 H,2 H,2 H-per-fluorodecyltriethoxysilane. And its properties are characterized in detail. CO2 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 degrees. However, hydrophobic modification has no significant effect on the crystalline phase, surface morphology and pore size distribution of the ceramic mem-brane. With ethanolamine (MEA) as absorbent, CO2 mass transfer rate and capture efficiency using modified hydrophobic ceramic membrane are 46.6 x 10(-3) mol/(m(2)center dot 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 CO2 capture by gas-liquid membrane contactor with ceramic membrane.

Automated summary

In this study, Al2O3 ceramic membrane was modified to be hydrophobic by grafting 1H, 1H, 2H, 2H-per-fluorodecyltriethoxysilane, and its properties were characterized in detail. The CO2 capture performance of the modified ceramic membrane was investigated through experiments. Results showed that the wetting resistance of the modified membrane was significantly improved, and the contact angle increased from 49.8 to 130.9 degrees. With the use of ethanolamine (MEA) as an absorbent, the CO2 mass transfer rate and capture efficiency using the modified hydrophobic ceramic membrane were greatly increased compared to the original membrane. After 72 hours of immersion in MEA solution, the quality and pore size of the ceramic membrane did not show significant changes. This study provides valuable insights for the industrial application of gas-liquid membrane contactors with ceramic membranes for CO2 capture.