Fig. 6

Multiple adsorption–desorption cycle test of SLHSP. a Schematic illustration of the CO₂ sorption in a fixed-bed reactor. b Multiple cycles of CO₂ adsorption–desorption over SLHSP. c SEM images of the spent SLHSP after 60 cycles. d TGA profile of the spent SLHSP after 60 cycles. e Comparison of the weight loss between SLHSP and TEPA-impregnated MSP at 100 °C in flowing N₂. f Carton showing that the hydrophobic outer layer of SLHSP prevents the penetration of TEPA molecules through the shell