Effect of polymer concentration on the structure and performance of PEI hollow fiber membrane contactor for CO2 stripping

► Different concentration of PEI hollow fiber membranes on CO2 stripping was studied. ► Increased in polymer concentration enhanced the wetting pressure of PEI membranes. ► Combined finger-like and sponge-like structure contributed to high wetting pressure. ► Stripping flux performance of PEI membranes is at par with commercial membranes.